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,name,description
0,&,Start a new process in the background
1,alias,Create an alias2,apropos,Search Help manual pages (man -k)
3,apt,Search for and install software packages (Debian/Ubuntu)
4,apt-get,Search for and install software packages (Debian/Ubuntu)
5,aptitude,Search for and install software packages (Debian/Ubuntu)
6,aspell,Spell Checker
7,at,Schedule a command to run once at a particular time
8,awk,"Find and Replace text, database sort/validate/index"
9,basename,Strip directory and suffix from filenames
10,base32,Base32 encode/decode data and print to standard output
11,base64,Base64 encode/decode data and print to standard output
12,bash,GNU Bourne-Again SHell
13,bc,Arbitrary precision calculator language
14,bg,Send to background
15,bind,Set or display readline key and function bindings •
16,break,Exit from a loop17,builtin,Run a shell builtin
18,bzip2,Compress or decompress named file(s)
19,cal,Display a calendar
20,caller,Return the context of any active subroutine call21,case,Conditionally perform a command
22,cat,Concatenate and print (display) the content of files
23,cd,Change Directory
24,cfdisk,Partition table manipulator for Linux
25,chattr,Change file attributes on a Linux file system
26,chgrp,Change group ownership
27,chmod,Change access permissions
28,chown,Change file owner and group
29,chpasswd,Update passwords in batch mode
30,chroot,Run a command with a different root directory
31,chkconfig,System services (runlevel)
32,cksum,Print CRC checksum and byte counts
33,cmp,Compare two files
34,comm,Compare two sorted files line by line
35,command,Run a command - ignoring shell functions36,continue,Resume the next iteration of a loop37,cp,Copy one or more files to another location
38,cpio,Copy files to and from archives
39,cron,Daemon to execute scheduled commands
40,crontab,Schedule a command to run at a later time
41,csplit,Split a file into context-determined pieces
42,curl,Transfer data  from or to a server
43,cut,Divide a file into several parts
44,date,Display or change the date & time
45,dc,Desk Calculator
46,dd,"Data Duplicator - convert and copy a file, write disk headers, boot records"
47,ddrescue,Data recovery tool
48,declare,Declare variables and give them attributes •
49,df,Display free disk space
50,diff,Display the differences between two files
51,diff3,Show differences among three files
52,dig,DNS lookup
53,dir,Briefly list directory contents
54,dircolors,Colour setup for 'ls'
55,dirname,Convert a full pathname to just a path
56,dirs,Display list of remembered directories
57,dos2unix,Windows/MAC to UNIX text file format converter
58,dmesg,Print kernel & driver messages
59,dpkg,Package manager  (Debian/Ubuntu).
60,du,Estimate file space usage
61,echo,Display message on screen •
62,egrep,Search file(s) for lines that match an extended expression
63,eject,Eject removable media
64,enable,Enable and disable builtin shell commands •
65,env,Environment variables
66,eval,Evaluate several commands/arguments
67,exec,Execute a command
68,exit,Exit the shell
69,expand,Convert tabs to spaces
70,export,Set an environment variable
71,expr,Evaluate expressions
72,false,"Do nothing, unsuccessfully"
73,fdformat,Low-level format a floppy disk
74,fdisk,Partition table manipulator for Linux
75,fg,Send job to foreground
76,fgrep,Search file(s) for lines that match a fixed string
77,file,Determine file type
78,find,Search for files that meet a desired criteria
79,fmt,Reformat paragraph text
80,fold,Wrap text to fit a specified width
81,for,"Expand words, and execute commands"
82,fsck,File system consistency check and repair
83,ftp,File Transfer Protocol
84,function,Define Function Macros
85,fuser,Identify/kill the process that is accessing a file
86,gawk,Find and Replace text within file(s)
87,getopts,Parse positional parameters
88,getfacl,Get file access control lists
89,grep,Search file(s) for lines that match a given pattern
90,groupadd,Add a user security group
91,groupdel,Delete a group
92,groupmod,Modify a group
93,groups,Print group names a user is in
94,gzip,Compress or decompress named file(s)
95,hash,Remember the full pathname of a name argument
96,head,Output the first part of file(s)
97,history,Command History
98,hostname,Print or set system name
99,htop,Interactive process viewer
100,iconv,Convert the character set of a file
101,id,Print user and group id's

102,if,Conditionally perform a command

103,ifconfig,Configure a network interface

104,ifdown,Stop a network interface

105,ifup,Start a network interface up

106,import,Capture an X server screen and save the image to file

107,install,Copy files and set attributes

108,iostat,Report CPU and i/o statistics

109,ip,"Routing, devices and tunnels"

110,jobs,List active jobs •

111,join,Join lines on a common field

112,kill,Kill a process by specifying its PID

113,killall,Kill processes by name

114,klist,List cached Kerberos tickets

115,less,Display output one screen at a time

116,let,Perform arithmetic on shell variables •

117,link,Create a link to a file

118,ln,Create a symbolic link to a file

119,local,Create a function variable •

120,locate,Find files

121,logname,Print current login name

122,logout,Exit a login shell •

123,look,Display lines beginning with a given string

124,lpc,Line printer control program

125,lpr,Print files

126,lprm,Remove jobs from the print queue

127,lsattr,List file attributes on a Linux second extended file system

128,lsblk,List block devices

129,ls,List information about file(s)

130,lsof,List open files

131,lspci,List all PCI devices

132,man,Help manual

133,mapfile,Read lines from standard input into an indexed array variable •

134,mkdir,Create new folder(s)

135,mkfifo,Make FIFOs (named pipes)

136,mkfile,Make a file

137,mknod,Make block or character special files

138,mktemp,Make a temporary file

139,more,Display output one screen at a time

140,most,Browse or page through a text file

141,mount,Mount a file system

142,mtools,Manipulate MS-DOS files

143,mtr,Network diagnostics (traceroute/ping)

144,mv,Move or rename files or directories

145,mmv,Mass Move and rename (files)

146,nc,"Netcat, read and write data across networks"

147,netstat,Networking connections/stats

148,nft,nftables for packet filtering and classification

149,nice,Set the priority of a command or job

150,nl,Number lines and write files

151,nohup,Run a command immune to hangups

152,notify-send,Send desktop notifications

153,nslookup,Query Internet name servers interactively

154,open,Open a file in its default application

155,op,Operator access

156,passwd,Modify a user password

157,paste,Merge lines of files

158,Perf,Performance analysis tools for Linux

159,ping,Test a network connection

160,pgrep,List processes by name

161,pkill,Kill processes by name

162,popd,Restore the previous value of the current directory

163,pr,Prepare files for printing

164,printenv,Print environment variables

165,printf,Format and print data •

166,ps,Process status

167,pushd,Save and then change the current directory

168,pv,Monitor the progress of data through a pipe

169,pwd,Print Working Directory

170,quota,Display disk usage and limits

171,quotacheck,Scan a file system for disk usage

172,ram,ram disk device

173,rar,Archive files with compression

174,rcp,Copy files between two machines

175,read,Read a line from standard input •

176,readarray,Read from stdin into an array variable •

177,readonly,Mark variables/functions as readonly

178,rename,Rename files

179,return,Exit a shell function

180,rev,Reverse lines of a file

181,rm,Remove files

182,rmdir,Remove folder(s)

183,rsync,Remote file copy (Synchronize file trees)

184,screen,"Multiplex terminal, run remote shells via ssh"

185,scp,Secure copy (remote file copy)

186,sdiff,Merge two files interactively

187,sed,Stream Editor

188,select,Accept user choices via keyboard input

189,seq,Print numeric sequences

190,set,Manipulate shell variables and functions

191,setfacl,Set file access control lists.

192,sha256sum,Compute and check SHA256 (256-bit) checksums

193,shift,Shift positional parameters

194,shopt,Shell Options

195,shuf,Generate random permutations

196,shutdown,Shutdown or restart linux

197,sleep,Delay for a specified time

198,slocate,Find files

199,sort,Sort text files

200,source,Run commands from a file '.'  •

201,split,Split a file into fixed-size pieces

202,ss,Socket Statistics

203,ssh,Secure Shell client (remote login program)

204,stat,Display file or file system status

205,strace,Trace system calls and signals

206,su,Substitute user identity

207,sudo,Execute a command as another user

208,sum,Print a checksum for a file

209,suspend,Suspend execution of this shell •

210,sync,Synchronize data on disk with memory

211,tabs,Set tabs on a terminal

212,tail,Output the last part of a file

213,tar,"Store, list or extract files in an archive"

214,tee,Redirect output to multiple files

215,test,Evaluate a conditional expression

216,time,Measure Program running time

217,timeout,Run a command with a time limit

218,times,User and system times

219,tmux,Terminal multiplexer

220,touch,Change file timestamps

221,top,List processes running on the system

222,tput,"Set terminal-dependent capabilities, color, position"

223,traceroute,Trace Route to Host

224,trap,Execute a command when the shell receives a signal •

225,tr,"Translate, squeeze, and/or delete characters"

226,true,"Do nothing, successfully"

227,tsort,Topological sort

228,tty,Print filename of terminal on stdin

229,type,Describe a command •

230,ulimit,Limit user resources •

231,umask,Users file creation mask

232,unalias,Remove an alias •

233,uname,Print system information

234,unexpand,Convert spaces to tabs

235,uniq,Uniquify files

236,units,Convert units from one scale to another

237,unix2dos,UNIX to Windows or MAC text file format converter

238,unrar,Extract files from a rar archive

239,unset,Remove variable or function names

240,unshar,Unpack shell archive scripts

241,until,Execute commands (until error)

242,useradd,Create new user account

243,userdel,Delete a user account

244,usermod,Modify user account

245,users,List users currently logged in

246,uuencode,Encode a binary file

247,uudecode,Decode a file created by uuencode

248,vi,Text Editor

249,vmstat,Report virtual memory statistics

250,w,Show who is logged on and what they are doing

251,wait,Wait for a process to complete •

252,watch,Execute/display a program periodically

253,wc,"Print byte, word, and line counts"

254,whereis,"Search the user's $path, man pages and source files for a program"
255,which,Search the user's $path for a program file
256,while,Execute commands
257,who,Print all usernames currently logged in
258,whoami,Print the current user id and name ('id -un')
259,write,Send a message to another user
260,xargs,"Execute utility, passing constructed argument list(s)"
261,xdg-open,Open a file or URL in the user's preferred application.
262,xxd,Make a hexdump or do the reverse
263,xz,Compress or decompress .xz and .lzma files
264,yes,Print a string until interrupted
265,zip,Package and compress (archive) files
266,.,Run a command script in the current shell
267,!!,Run the last command again
268,###,Comment / Remark