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supports the use of symbols for directory names.
Like with PC-DOS, VMS directories and sub-directories are tree
structured. The system root directory for your disk has the
name [000000], and in it are the names of all the sub-directories
for your disk. The directories for an imaginary user, CS335825305,
would be located like this:
System Root Directory:
[000000]
. . . .
CS3358 Directories: . . . .
. . *. .
... [CS3358251] [CS3358252] [CS3358253] [CS3358254] ...
. . .
CS3358253 Directories: . . .
. *. .
... [CS3358253.04HOPE] [CS3358253.05JONES] [CS3358253.06KEY] ...
. .
CS335825305 Directories: . .
*. *.
[CS3358253.05JONES.MAIL] [CS3358253.05JONES.BULL]
If you're not using sub-directories, but want to, you can
create them with the CREATE command:
CREATE/DIR [.sub_name]
VMS allows directories to be seven or eight levels deep, but
one or two levels is enough for most users.
VMS also allows the symbols < and > to be used instead of
[ and ], to specify directory names. CD fully supports this.
Code for CD.COM
>>>>>>>>>>>>>>>
$! CD.COM v6.09
$! The Ultimate Change Directory Command.
$!
$ hdir = f$trnlnm("SYS$LOGIN") ! Home Directory
$ ndir = f$edit(p1,"UPCASE") ! New Directory
$ odir = f$environment("DEFAULT") ! Old Directory
$ prompton = (f$edit(f$trnlnm("SYS$PROMPT"),"UPCASE") .eqs. "ON")
$!
$ if (ndir .eqs. "") then goto DISPLAY ! No Dir
$ if (ndir .eqs. "*") then goto DIRSEARCH ! Search for Dirs
$ if (ndir .eqs. "?") then goto HELP ! Instructions
$!
$ PARSE:
$ length = f$length(ndir) ! Fix up ndir
$ if (f$location("@",ndir) .eq. 0) .or. -
(f$location("$",ndir) .eq. 0) then ndir = f$extract(1, length - 1, ndir)
$ right = f$location("]",ndir) + 1
$ if (right .gt. length) then right = f$location(">", ndir)
$ if (right .le. length) then ndir = f$extract(0, right, ndir)
$!
$ if (f$trnlnm(ndir) .eqs. "") then goto CASESYM ! Not Logical Name
$ ndir = f$trnlnm(ndir) ! Logical Name
$ goto PARSE
$!
$ CASESYM:
$ if ("''&ndir'" .eqs. "") then goto CASE0 ! Not Symbol
$ ndir = 'ndir' ! Symbol
$ goto PARSE
$!
$ CASE0:
$ len_ndir = f$length(ndir) ! Regular Dir
$ if (f$location("[", ndir) .lt. len_ndir) .or. -
(f$location("<", ndir) .lt. len_ndir) then goto SETDIR
$!
$ CASE1: ! Home Dir
$ if ((ndir .nes. "HOME") .and. (ndir .nes. "\")) then goto CASE2
$ ndir = hdir
$ goto SETDIR
$!
$ CASE2: ! . .. .dir
$ if (f$location(".", ndir) .nes. 0) then goto CASE3
$ if (ndir .eqs. "..") then ndir = "-"
$ if (f$extract(0, 2, ndir) .eqs. "..") -
then ndir = "-" + f$extract(1, len_ndir - 1, ndir)
$ ndir = "[" + ndir + "]"
$ if (ndir .eqs. "[.]") then ndir = odir
$ goto SETDIR
$!
$ CASE3: ! :
$ if (f$location(":", ndir) .ge. len_ndir) then goto CASE4
$ left = f$location(":", ndir) + 1
$ symbol = f$extract(left, 1, ndir)
$ if (symbol .eqs. ":") then goto CASE3B ! :: Node
$ if ((symbol .eqs. "[") .or. (symbol .eqs. "<")) then goto SETDIR
$ ndir = f$extract(0, left, ndir) + "[" -
+ f$extract(left, len_ndir - left+1, ndir) + "]"
$ goto SETDIR
$!
$ CASE3B: ! NODE::nothing
$ if (f$length(ndir)-1 .gt. left) then goto CASE3C
$ ndir = ndir + "[000000]"
$ goto SETDIR