GWHed/nl2bash · Datasets at Hugging Face

nl stringlengths 13 387	bash stringlengths 1 532
Search for all the directories in directories taken from the glob pattern '/path/to/folders/*' and add the extension ".mbox" to all and create directories named 'Messages' inside them	find /path/to/folders/* -type d -exec mv {} {}.mbox \; -exec mkdir {}.mbox/Messages \;
Search for all the directories named 'm?' under current directory tree, add the extension ".mbox" to all, create a 'Messages' directories inside them and move all files with .emlx extension to 'Messages' directory	find . -name 'm?' -type d -exec mv '{}' '{}.mbox' ';' -exec mkdir '{}.mbox/Messages' ';' -exec sh -c 'mv {}.mbox/*.emlx {}.mbox/Messages' ';'
Search for all directories named foo, FOO, or any other combination of uppercase and lowercase characters beneath the current directory.	find . -iname foo -type d
search for all empty directories in the folder /home	find /home -type d -empty
Search for all files and directories named foo, FOO, or any other combination of uppercase and lowercase characters beneath the current directory.	find . -iname foo
search for all files ending with ".mkv" in current folder	find /volume1/uploads -name "*.mkv"
search for all the files ending with "fits" in the folder "/store/01"	find /store/01 -name "*.fits"
search for all the files having spaces in the current folder and save the output to the variable founddata	founddata=`find . -name "filename including space" -print0`
Search for all files in the /home directory tree that have the same inode number	find /home -xdev -inum 2655341
Search for all files in the current directory recursively whose names begin with "Linkin Park"	find . -name "Linkin Park*"
Search for all files in the current directory recursively whose names contain "linkin", ignoring the case	find . -iname linkin
Search for all files in the current directory recursively whose names end with "Linkin Park"	find . -name "*Linkin Park"
search for all the files in the current directory which have been modified in the last 24 hours.	find . -mtime -1
search for all the files in the current directory which belong to the user "xuser1" and change the owner ship of them to "user2"	find . -user xuser1 -exec chown -R user2 {} \;
search for all the files in the current directory which have the group staff and have write permission enabled to the user and display them.	find . -group staff -perm -2000 -print
search for all the files in the current directory which have the name a.out or core or which end with .o and delete them.	find . \( -name a.out -o -name '*.o' -o -name 'core' \) -exec rm {} \;
search for all the files in the current directory which have size greater than 10KB (approx) and less than 32KB(approx).	find . -size +10000c -size -32000c -print
search for all the files in current folder and display all the file names separated by space	find . \| paste -sd " "
search for all the files in the current folder and sort them in the order of their depth and display the file names	find -type d -printf '%d\t%P\n' \| sort -r -nk1 \| cut -f2-
search for all the files in the current folder which are bigger than 10KB and display them biggest file	find . -size +10k -exec ls -ls {} \+ \| sort -n \| tail -1
search for all the files in the current folder which have spaces and force delete them	find . -name "filename including space" -print0 \| xargs -0 rm -rdf
search for all the files in current folder which start with "file2015-0" and move them to another folder	find . -name "file2015-0*" -exec mv {} .. \;
search for all the files in current folder which start with "file2015-0" and move them to frst 400 fiiles to another folder	find . -name "file2015-0*" \| head -400 \| xargs -I filename mv filename
search for all the files in the current folder which start with gen and end with bt2 and assign the output list to the variable var.	var="$(find . -name 'gen*.bt2')"
search for all the files in the folder /data/images which are modified after /tmp/foo	find /data/images -newer /tmp/foo
search for all the files in the folder /home which have sticky bit set and have the permissions 553	find /home -perm 1553
search for all the files in the folder /home/user1 which end with ".bin"	find /home/user1 -name "*.bin"
search for all the files in the folder /usr/bin which have not been accessed in the last 100*24 hours	find /usr/bin -type f -atime +100
Search for all the files in man pages and return the manual page for grep	find /usr/share/man/ -regex ./grep
Search for all files named foo, FOO, or any other combination of uppercase and lowercase characters beneath the current directory.	find . -iname foo -type f
Search for all files newer than file /tmp/t	find / -newer /tmp/t
Search for all files newer than file /tmp/t1 but not newer than file /tmp/t2	find / -newer /tmp/t1 -and -not -newer /tmp/t2
Search for all files not newer than file /tmp/t	find / -not -newer /tmp/t
Search for all files owned by user www-data that are not larger than 100kb	find -user www-data -not -size +100k
search for all the file sin the current folder which are bigger than 10KB and display them smallest file	find . -size +10k -exec ls -lS {} \+ \| head -1
Search for all files that end in ".conf"	find / -type f -name "*.conf"
search for all the files which have not been modified in the last 6 months (180 days) in current folder and display the disk usage of them	find . -mtime +180 -exec du -sh {} \;
Search for all files with either "sitesearch" or "demo" in their path names	find . -ipath 'sitesearch' -ipath 'demo'
Search for all files with either "sitesearch" or "demo" in their path names	find . -iregex '.sitesearch.' -iregex '.demo.'
Search for all files with either "sitesearch" or "demo" in their path names	find . \| grep -i demo \| grep -i sitesearch
searching for all files with the extension mp3	find / -name *.mp3
Search for all files with same inode NUM	find . -inum NUM
Search for all files with the same inode number 41525360	find . -follow -inum 41525360
search for all the foo.txt files in the current folder and move them to another location	find . -name foo.txt -print0 \| xargs -0 -I{} mv {} /some/new/location/{}
search for all the jpg files in the folder "/mnt/hda1/zdjecia/test1/" and copy these files to the folder /mnt/hda1/test/<same name as the found file>	find /mnt/hda1/zdjecia/test1/ -iname “*.jpg” -type f -exec cp {} -rv /mnt/hda1/test{} ‘;’
Search for all jpg images on the system and archive them	find / -name *.jpg -type f -print \| xargs tar -cvzf images.tar.gz
search for all the mp3 files in the file system and move them to the folder /mnt/mp3	find / -iname "*.mp3" -exec mv {} /mnt/mp3 \;
search for all the mp3 files in the folder /home/you which have been accessed 24 ago	find /home/you -iname “*.mp3” -atime 01 -type -f
search for all mp3 files in the folder /home/you which have been accessed exactly 10*24 hours ago	find /home/you -iname "*.mp3" -atime 10 -type -f
search for all non empty regular/normal files in the current folder and empty them ie., delete the content not the file	find . -type f -maxdepth 1 -not -empty -print0 \| xargs -0i cp /dev/null {}
Search for all non-hidden files	find . -name '*'
search for all the non-hidden files in the current directory and do not search in the subfolders and dispaly their name and size.	find . -maxdepth 1 -name '[!.]*' -printf 'Name: %16f Size: %6s\n'
search for all pdf files in the folder "/home/pdf" which have been accessed in the last 60*24 hours	find /home/you -iname "*.pdf" -atime -60 -type -f
search for all perl files in the folder /nas/projects/mgmt/scripts/perl which have been modified yesterday	find /nas/projects/mgmt/scripts/perl -mtime 1 -daystart -iname "*.pl"
search for all the php files in the folder "/home/mywebsite" which have been changed in the last 30*24 hours	find /home/mywebsite -type f -name "*.php" -ctime -30
search for all the regular/normal files in the /etc folder which have been modified in the last 24 hours	find /etc/ -type f -mtime -1
search for all regular files in the current directory which have the extension "c" or "asm"	find . -type f \( -iname ".c" -or -iname ".asm" \)
search for all regular/normal files in current folder and display all the files which contain 16 lines	find . -type f -print0 \| xargs -0 grep -cH '.' \| grep ':16$'
search for all the regular files in the current folder and display the contents	find . -type f -exec cat {} \;
search for all regular/normal files in the current folder and display the number of lines in the file	find . -type f -print \| xargs -L1 wc -l
search for all regular/normal files in the current folder and display the number of lines in the file	find . -type f -print0 \| xargs -0L1 wc -l
search for all the regular files that have been changed in the last 48 hours and sync these to another folder	find /my/source/directory -ctime -2 -type f -printf "%P\n" \| xargs -IFILE rsync -avR /my/./source/directory/FILE /my/dest/directory/
search for all the regular/normal files with the name "access.log" in the folder /var/www which are bigger than 100MB	find /var/www -type f -name «access.log*» -size +100M
search for all the regular/normal mp3 files in the file system and move them to the folder /mnt/mp3	find / -iname "*.mp3" -type f -exec /bin/mv {} /mnt/mp3 \;
search for all the regular/normal mp3 files in the file system and move them to the folder /mnt/mp3	find / -iname "*.mp3" -type f -print0 \| xargs -0 -I '{}' /bin/mv "{}" /mnt/mp3/
search for all the regular/normal mp3 files in the file system and move them to the folder /mnt/mp3	find / -iname "*.mp3" -type f \| xargs -I '{}' mv {} /mnt/mp3
search for all the rpm files in the file system which reside in the same partition as that of the root	find / -xdev -name "*.rpm"
search for all Scala files under the current directory that contain the string null	find . -type f -name "*.scala" -exec grep -B5 -A10 'null' {} \;
search for all tar.gz compress files in the current folder	find -name *.tar.gz
search for all the text files and display the long listing of these files from that directory	find . -name "*.txt" -execdir ls -la {} ";"
search for all the text files in the folder /foo and delete them	find /foo/ -name "*.txt" -exec rm -v {} \;
search for all text files in the folder /home	find /home -name *.txt
search for all xml files in current folder and display them	find . -name "*.xml" -exec echo {} \;
Search for all zero-byte files and move them to the /tmp/zerobyte folder	find test -type f -size 0 -exec mv {} /tmp/zerobyte \;
Search for broken symlinks	find -L -type l
Search for the case insensitive pattern 'PATTERN' in all files under current directory tree and display the matched files	find . -print \| xargs grep -l -i "PATTERN"
Search for case insensitive pattern 'search for me' in all files that match the name pattern '.[!r]' under current directory tree	find . -name ".[!r]" -exec grep -i -l "search for me" {} \;
Search for the case insensitive pattern 'search for me' in all files with '.p', '.w' and '.i' extension under current directory tree without descending into '.svn' and 'pdv' directories	find . \( \( -name .svn -o -name pdv \) -type d -prune \) -o \( -name '*.[pwi]' -type f -exec grep -i -l "search for me" {} + \)
Search for the case insensitive regex expanded by $2 in all files named $1 (to be expanded) under current directory	find . -name "$1" -type f -exec grep -i "$2" '{}' \;
Search for the case insensitive regex expanded by $2 in all files named $1 (to be expanded) under current directory	find . -name "$1" -type f -print0 \| xargs -0 grep -i "$2"
Search for the case insensitive regex expanded by $2 in all files named $1 (to be expanded) under current directory	find . -name $1 -type f -exec grep -i $2 '{}' \;
Search for case-insensitive "string" in "log.tar.gz"	zcat log.tar.gz \| grep -a -i "string"
(Linux specific) Search for command "tail" in the maps of the process with PID 2671	cat /proc/2671/maps \| grep `which tail`
search for dbmsspool.sql file in the current folder	find . -print\|grep ?i dbmspool.sql
search for the directory "config" in the current folder	find . -name config -type d
search for the directory "config" in the current folder and change directory to it	cd `find . -name "config"`
search for the directory "mysql" in the /etc folder	find /etc -name mysql -type d
search for the directory "mysql" in the entire file system	find / -name mysql -type d
search for the directory "ora10" in the entire file system	find / -type d -name "ora10"
search for the directory "uploads" in current folder and change the permission of the folder and all the files to 755	find . -type d -name 'uploads' -print0 \| xargs -0 chmod -R 755
Search for directory foo ignoring case	find . -iname foo -type d
search for directories in the folder "test" which end have 5 digits as their name	find ./test -type d -name '[0-9][0-9][0-9][0-9][0-9]'
search for directories in the folder "test" which end with 5 digits using regular expressions	find ./test -regextype posix-egrep -type d -regex '.*/[0-9]{5}$'
search for the directory starting with "ora10" in the entire file system	find / -type d -name "ora10*"
search for the directory testdir in the folder /home	find /home -type d -name testdir
Search for directories that contain the phrase "foo" but do not end in ".bar"	find . -name 'foo' ! -name '*.bar' -type d -print
Search for empty files	find . -size 0k
Search for ERROR in all btree*.c files under current directory	grep ERROR $(find . -type f -name 'btree*.c')
Search for the extended grep regex 'expr' in all files with '.c' and '.h' extension under current directory tree	find . -name '*.[ch]' \| xargs grep -E 'expr'
Search for the extened regex 'expr' in all files with '.c' and '.h' extension under current directory tree	find . -name '*.[ch]' \| xargs grep -E 'expr'

Search for all the directories in directories taken from the glob pattern '/path/to/folders/*' and add the extension ".mbox" to all and create directories named 'Messages' inside them

find /path/to/folders/* -type d -exec mv {} {}.mbox \; -exec mkdir {}.mbox/Messages \;

Search for all the directories named 'm?' under current directory tree, add the extension ".mbox" to all, create a 'Messages' directories inside them and move all files with .emlx extension to 'Messages' directory

find . -name 'm?' -type d -exec mv '{}' '{}.mbox' ';' -exec mkdir '{}.mbox/Messages' ';' -exec sh -c 'mv {}.mbox/*.emlx {}.mbox/Messages' ';'

Search for all directories named foo, FOO, or any other combination of uppercase and lowercase characters beneath the current directory.

find . -iname foo -type d

search for all empty directories in the folder /home

find /home -type d -empty

Search for all files and directories named foo, FOO, or any other combination of uppercase and lowercase characters beneath the current directory.

find . -iname foo

search for all files ending with ".mkv" in current folder

find /volume1/uploads -name "*.mkv"

search for all the files ending with "fits" in the folder "/store/01"

find /store/01 -name "*.fits"

search for all the files having spaces in the current folder and save the output to the variable founddata

founddata=`find . -name "filename including space" -print0`

Search for all files in the /home directory tree that have the same inode number

find /home -xdev -inum 2655341

Search for all files in the current directory recursively whose names begin with "Linkin Park"

find . -name "Linkin Park*"

Search for all files in the current directory recursively whose names contain "linkin", ignoring the case

find . -iname *linkin*

Search for all files in the current directory recursively whose names end with "Linkin Park"

find . -name "*Linkin Park"

search for all the files in the current directory which have been modified in the last 24 hours.

find . -mtime -1

search for all the files in the current directory which belong to the user "xuser1" and change the owner ship of them to "user2"

find . -user xuser1 -exec chown -R user2 {} \;

search for all the files in the current directory which have the group staff and have write permission enabled to the user and display them.

find . -group staff -perm -2000 -print

search for all the files in the current directory which have the name a.out or core or which end with .o and delete them.

find . $ -name a.out -o -name '*.o' -o -name 'core' $ -exec rm {} \;

search for all the files in the current directory which have size greater than 10KB (approx) and less than 32KB(approx).

find . -size +10000c -size -32000c -print

search for all the files in current folder and display all the file names separated by space

find . | paste -sd " "

search for all the files in the current folder and sort them in the order of their depth and display the file names

find -type d -printf '%d\t%P\n' | sort -r -nk1 | cut -f2-

search for all the files in the current folder which are bigger than 10KB and display them biggest file

find . -size +10k -exec ls -ls {} \+ | sort -n | tail -1

search for all the files in the current folder which have spaces and force delete them

find . -name "filename including space" -print0 | xargs -0 rm -rdf

search for all the files in current folder which start with "file2015-0" and move them to another folder

find . -name "file2015-0*" -exec mv {} .. \;

search for all the files in current folder which start with "file2015-0" and move them to frst 400 fiiles to another folder

find . -name "file2015-0*" | head -400 | xargs -I filename mv filename

search for all the files in the current folder which start with gen and end with bt2 and assign the output list to the variable var.

var="$(find . -name 'gen*.bt2')"

search for all the files in the folder /data/images which are modified after /tmp/foo

find /data/images -newer /tmp/foo

search for all the files in the folder /home which have sticky bit set and have the permissions 553

find /home -perm 1553

search for all the files in the folder /home/user1 which end with ".bin"

find /home/user1 -name "*.bin"

search for all the files in the folder /usr/bin which have not been accessed in the last 100*24 hours

find /usr/bin -type f -atime +100

Search for all the files in man pages and return the manual page for grep

find /usr/share/man/ -regex .*/grep*

Search for all files named foo, FOO, or any other combination of uppercase and lowercase characters beneath the current directory.

find . -iname foo -type f

Search for all files newer than file /tmp/t

find / -newer /tmp/t

Search for all files newer than file /tmp/t1 but not newer than file /tmp/t2

find / -newer /tmp/t1 -and -not -newer /tmp/t2

Search for all files not newer than file /tmp/t

find / -not -newer /tmp/t

Search for all files owned by user www-data that are not larger than 100kb

find -user www-data -not -size +100k

search for all the file sin the current folder which are bigger than 10KB and display them smallest file

find . -size +10k -exec ls -lS {} \+ | head -1

Search for all files that end in ".conf"

find / -type f -name "*.conf"

search for all the files which have not been modified in the last 6 months (180 days) in current folder and display the disk usage of them

find . -mtime +180 -exec du -sh {} \;

Search for all files with either "sitesearch" or "demo" in their path names

find . -ipath '*sitesearch*' -ipath '*demo*'

Search for all files with either "sitesearch" or "demo" in their path names

find . -iregex '.*sitesearch.*' -iregex '.*demo.*'

Search for all files with either "sitesearch" or "demo" in their path names

find . | grep -i demo | grep -i sitesearch

searching for all files with the extension mp3

find / -name *.mp3

Search for all files with same inode NUM

find . -inum NUM

Search for all files with the same inode number 41525360

find . -follow -inum 41525360

search for all the foo.txt files in the current folder and move them to another location

find . -name foo.txt -print0 | xargs -0 -I{} mv {} /some/new/location/{}

search for all the jpg files in the folder "/mnt/hda1/zdjecia/test1/" and copy these files to the folder /mnt/hda1/test/<same name as the found file>

find /mnt/hda1/zdjecia/test1/ -iname “*.jpg” -type f -exec cp {} -rv /mnt/hda1/test{} ‘;’

Search for all jpg images on the system and archive them

find / -name *.jpg -type f -print | xargs tar -cvzf images.tar.gz

search for all the mp3 files in the file system and move them to the folder /mnt/mp3

find / -iname "*.mp3" -exec mv {} /mnt/mp3 \;

search for all the mp3 files in the folder /home/you which have been accessed 24 ago

find /home/you -iname “*.mp3” -atime 01 -type -f

search for all mp3 files in the folder /home/you which have been accessed exactly 10*24 hours ago

find /home/you -iname "*.mp3" -atime 10 -type -f

search for all non empty regular/normal files in the current folder and empty them ie., delete the content not the file

find . -type f -maxdepth 1 -not -empty -print0 | xargs -0i cp /dev/null {}

Search for all non-hidden files

find . -name '*'

search for all the non-hidden files in the current directory and do not search in the subfolders and dispaly their name and size.

find . -maxdepth 1 -name '[!.]*' -printf 'Name: %16f Size: %6s\n'

search for all pdf files in the folder "/home/pdf" which have been accessed in the last 60*24 hours

find /home/you -iname "*.pdf" -atime -60 -type -f

search for all perl files in the folder /nas/projects/mgmt/scripts/perl which have been modified yesterday

find /nas/projects/mgmt/scripts/perl -mtime 1 -daystart -iname "*.pl"

search for all the php files in the folder "/home/mywebsite" which have been changed in the last 30*24 hours

find /home/mywebsite -type f -name "*.php" -ctime -30

search for all the regular/normal files in the /etc folder which have been modified in the last 24 hours

find /etc/ -type f -mtime -1

search for all regular files in the current directory which have the extension "c" or "asm"

find . -type f $ -iname "*.c" -or -iname "*.asm" $

search for all regular/normal files in current folder and display all the files which contain 16 lines

find . -type f -print0 | xargs -0 grep -cH '.' | grep ':16$'

search for all the regular files in the current folder and display the contents

find . -type f -exec cat {} \;

search for all regular/normal files in the current folder and display the number of lines in the file

find . -type f -print | xargs -L1 wc -l

search for all regular/normal files in the current folder and display the number of lines in the file

find . -type f -print0 | xargs -0L1 wc -l

search for all the regular files that have been changed in the last 48 hours and sync these to another folder

find /my/source/directory -ctime -2 -type f -printf "%P\n" | xargs -IFILE rsync -avR /my/./source/directory/FILE /my/dest/directory/

search for all the regular/normal files with the name "access.log" in the folder /var/www which are bigger than 100MB

find /var/www -type f -name «access.log*» -size +100M

search for all the regular/normal mp3 files in the file system and move them to the folder /mnt/mp3

find / -iname "*.mp3" -type f -exec /bin/mv {} /mnt/mp3 \;

search for all the regular/normal mp3 files in the file system and move them to the folder /mnt/mp3

find / -iname "*.mp3" -type f -print0 | xargs -0 -I '{}' /bin/mv "{}" /mnt/mp3/

search for all the regular/normal mp3 files in the file system and move them to the folder /mnt/mp3

find / -iname "*.mp3" -type f | xargs -I '{}' mv {} /mnt/mp3

search for all the rpm files in the file system which reside in the same partition as that of the root

find / -xdev -name "*.rpm"

search for all Scala files under the current directory that contain the string null

find . -type f -name "*.scala" -exec grep -B5 -A10 'null' {} \;

search for all tar.gz compress files in the current folder

find -name *.tar.gz

search for all the text files and display the long listing of these files from that directory

find . -name "*.txt" -execdir ls -la {} ";"

search for all the text files in the folder /foo and delete them

find /foo/ -name "*.txt" -exec rm -v {} \;

search for all text files in the folder /home

find /home -name *.txt

search for all xml files in current folder and display them

find . -name "*.xml" -exec echo {} \;

Search for all zero-byte files and move them to the /tmp/zerobyte folder

find test -type f -size 0 -exec mv {} /tmp/zerobyte \;

Search for broken symlinks

find -L -type l

Search for the case insensitive pattern 'PATTERN' in all files under current directory tree and display the matched files

find . -print | xargs grep -l -i "PATTERN"

Search for case insensitive pattern 'search for me' in all files that match the name pattern '*.[!r]*' under current directory tree

find . -name "*.[!r]*" -exec grep -i -l "search for me" {} \;

Search for the case insensitive pattern 'search for me' in all files with '.p', '.w' and '.i' extension under current directory tree without descending into '.svn' and 'pdv' directories

find . $ \( -name .svn -o -name pdv $ -type d -prune \) -o $ -name '*.[pwi]' -type f -exec grep -i -l "search for me" {} + $

Search for the case insensitive regex expanded by $2 in all files named $1 (to be expanded) under current directory

find . -name "$1" -type f -exec grep -i "$2" '{}' \;

Search for the case insensitive regex expanded by $2 in all files named $1 (to be expanded) under current directory

find . -name "$1" -type f -print0 | xargs -0 grep -i "$2"

Search for the case insensitive regex expanded by $2 in all files named $1 (to be expanded) under current directory

find . -name $1 -type f -exec grep -i $2 '{}' \;

Search for case-insensitive "string" in "log.tar.gz"

zcat log.tar.gz | grep -a -i "string"

(Linux specific) Search for command "tail" in the maps of the process with PID 2671

cat /proc/2671/maps | grep `which tail`

search for dbmsspool.sql file in the current folder

find . -print|grep ?i dbmspool.sql

search for the directory "config" in the current folder

find . -name config -type d

search for the directory "config" in the current folder and change directory to it

cd `find . -name "config"`

search for the directory "mysql" in the /etc folder

find /etc -name mysql -type d

search for the directory "mysql" in the entire file system

find / -name mysql -type d

search for the directory "ora10" in the entire file system

find / -type d -name "ora10"

search for the directory "uploads" in current folder and change the permission of the folder and all the files to 755

find . -type d -name 'uploads' -print0 | xargs -0 chmod -R 755

Search for directory foo ignoring case

find . -iname foo -type d

search for directories in the folder "test" which end have 5 digits as their name

find ./test -type d -name '[0-9][0-9][0-9][0-9][0-9]'

search for directories in the folder "test" which end with 5 digits using regular expressions

find ./test -regextype posix-egrep -type d -regex '.*/[0-9]{5}$'

search for the directory starting with "ora10" in the entire file system

find / -type d -name "ora10*"

search for the directory testdir in the folder /home

find /home -type d -name testdir

Search for directories that contain the phrase "foo" but do not end in ".bar"

find . -name '*foo*' ! -name '*.bar' -type d -print

Search for empty files

find . -size 0k

Search for ERROR in all btree*.c files under current directory

grep ERROR $(find . -type f -name 'btree*.c')

Search for the extended grep regex 'expr' in all files with '.c' and '.h' extension under current directory tree

find . -name '*.[ch]' | xargs grep -E 'expr'

Search for the extened regex 'expr' in all files with '.c' and '.h' extension under current directory tree

find . -name '*.[ch]' | xargs grep -E 'expr'