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Top Forums Shell Programming and Scripting how to get the scripts full dir path Post 302691977 by Don Cragun on Sunday 26th of August 2012 10:39:55 PM
Old 08-26-2012
I'm confused. I see several references to readlink(1) in the responses to this request, but I didn't see any indication that the file being executed is a symbolic link.

In practice I would expect that $0 in a shell script would be set to an absolute pathname of the script if the script was found by invoking an absolute pathname for the script or if the script was found using a directory (with an absolute pathname) found in $PATH.

Otherwise, I would expect that $PWD/$0 would be an absolute pathname of the script if the shell script was invoked by using a relative pathname on the command line or was found using a directory (with a relative pathname) found in $PATH.

So, at least with the Bourne shell, bash, and ksh, the following should give an absolute pathname of the script if the following is included in the script before it makes any changes to its current working directory:
Code:
case "$0" in
(/*)    script_path="$0" ;;
(*)     script_path="$PWD"/"$0" ;;
esac

When this uses relative paths, the resulting $script_path may include dot and dot-dot components and may also contain unresolved symbolic links. But, it should always give you an absolute path to the file containing the executing script.
 

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PWD(1)							    BSD General Commands Manual 						    PWD(1)

NAME
pwd -- return working directory name SYNOPSIS
pwd [-LP] DESCRIPTION
pwd writes the absolute pathname of the current working directory to the standard output. The following options are available: -L If the PWD environment variable is an absolute pathname that contains neither "/./" nor "/../" and references the current directory, then PWD is assumed to be the name of the current directory. -P Print the physical path to the current working directory, with symbolic links in the path resolved. The default for the pwd command is -P. pwd is usually provided as a shell builtin (which may have a different default). EXIT STATUS
The pwd utility exits 0 on success, and >0 if an error occurs. SEE ALSO
cd(1), csh(1), ksh(1), sh(1), getcwd(3) STANDARDS
The pwd utility is expected to be conforming to IEEE Std 1003.1 (``POSIX.1''), except that the default is -P not -L. BUGS
In csh(1) the command dirs is always faster (although it can give a different answer in the rare case that the current directory or a con- taining directory was moved after the shell descended into it). pwd -L relies on the file system having unique inode numbers. If this is not true (e.g., on FAT file systems) then pwd -L may fail to detect that PWD is incorrect. BSD
October 30, 2003 BSD
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