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Full Discussion: getting a shell script to know it's path
Top Forums Shell Programming and Scripting getting a shell script to know it's path Post 51926 by Perderabo on Saturday 5th of June 2004 07:17:29 PM
Old 06-05-2004
This is a very hard problem. The script may have been launched via a relatively non-standard exec system call. If that is not the case, $0 may be an absolute or relative path or an item that can be found by searching PATH. But with a non-standard exec, $0 may not be useful .

Another wrinkle involves the fd filesystem that some versions of unix have. These versions, and Solaris is one, allow suid shell scripts, but use an fd to prevent the shell from opening the script directly. $0 will be useless in this case.

One technique that might work is obtaining the pid of the shell running the script and using lsof on that. But even this assumes that the script was exec'ed one way or another. If you something odd like:
cat /path/to/script | ksh
the shell won't have the script open so finding the script becomes much tougher.
 

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LEARN ABOUT SUNOS

script

script(1)							   User Commands							 script(1)

NAME

       script - make record of a terminal session

SYNOPSIS

       script [-a] [filename]

DESCRIPTION

       The  script  utility  makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
       record is saved in the file typescript. See WARNINGS.

       The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
       when the forked shell exits or when Control-d is typed.

OPTIONS

       The following option is supported:

       -a	Appends the session record to filename, rather than overwriting it.

NOTES

       script places everything that appears on the screen in filename, including prompts.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

WARNINGS

       script  can  pose  a  security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
       privileged user, that is, root. Be sure that typescript is not a link before running script.

SunOS 5.10							    30 Jan 2004 							 script(1)
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