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Top Forums Shell Programming and Scripting Need Help in going to ~ directory Post 302243778 by cfajohnson on Monday 6th of October 2008 02:56:47 PM
Old 10-06-2008
Quote:
Originally Posted by methyl
Which shell are you using?
Assuming there is an account in passwd file called zzzdba, and a directory under the user's home directory called comps, and you have permissions to "cd" to that directory.

This behaviour is a feature of ksh (see man pages). Tilde substitution only works on unquoted strings.

It is a feature of all standard Unix shells, as well as tcsh (and probably csh, but I don't have a copy to test with).
Quote:

This works:
cd ~myname
This doesn't work:
cd "~myname"

But if it's a variable, the tilde expansion is done during the assignment, and the variable can, and should be, quoted.
Quote:
In your case this should work.
COMPBD=~zzzdba/comps
cd ${COMPBD}

That will fail if there's a space in the directory name. Use:

Code:
cd "$COMPBD"

Quote:
You can check the substitution.
echo "${COMPDB}"

If it still doesn't work maybe you need to force ksh (or a shell which supports tilde substitution) on the very first line of your script.
#!/bin/ksh
 

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shift(1)                                                           User Commands                                                          shift(1)

NAME
shift - shell built-in function to traverse either a shell's argument list or a list of field-separated words SYNOPSIS
sh shift [n] csh shift [variable] ksh * shift [n] DESCRIPTION
sh The positional parameters from $n+1 ... are renamed $1 ... . If n is not given, it is assumed to be 1. csh The components of argv, or variable, if supplied, are shifted to the left, discarding the first component. It is an error for the variable not to be set or to have a null value. ksh The positional parameters from $n+1 $n+1 ... are renamed $1 ..., default n is 1. The parameter n can be any arithmetic expression that evaluates to a non-negative number less than or equal to $#. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), ksh(1), sh(1), attributes(5) SunOS 5.10 15 Apr 1994 shift(1)
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