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Top Forums Shell Programming and Scripting Full path of executing script in ksh? Post 83639 by BriceBu on Friday 16th of September 2005 02:54:27 PM
Old 09-16-2005
Question Full path of executing script in ksh?

Hello all,

Here's the scenario:

I've got a script, let's call it script1. This script invokes another script, which we'll call set_env, via the dot "." command, like so:

File: [script1]
#!/bin/ksh
#
region_id=DEV
. set_env ${region_id}
and so on. Script set_env sets up an execution environment for the remainder of script1 according to the value of the parameter (region_id) passed.

My question/problem is:

Let us assume that set_env resides in the same directory as script1. How can I ensure that set_env will be found by the shell, when the containing directory is not in the PATH, and is not the PWD at the time script1 was invoked? In other words, how can script1 tell the shell to look for set_env in whatever directory script1 happens to reside?

I understand that ${_} is supposed to return the full pathname of the script being executed, but when I try to use that in script1, it fails to return anything meaningful.

Any hints will be very much appreciated. Thanks!
 

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exit(1) 							   User Commands							   exit(1)

NAME
exit, return, goto - shell built-in functions to enable the execution of the shell to advance beyond its sequence of steps SYNOPSIS
sh exit [n] return [n] csh exit [ ( expr )] goto label ksh *exit [n] *return [n] DESCRIPTION
sh exit will cause the calling shell or shell script to exit with the exit status specified by n. If n is omitted the exit status is that of the last command executed (an EOF will also cause the shell to exit.) return causes a function to exit with the return value specified by n. If n is omitted, the return status is that of the last command exe- cuted. csh exit will cause the calling shell or shell script to exit, either with the value of the status variable or with the value specified by the expression expr. The goto built-in uses a specified label as a search string amongst commands. The shell rewinds its input as much as possible and searches for a line of the form label: possibly preceded by space or tab characters. Execution continues after the indicated line. It is an error to jump to a label that occurs between a while or for built-in command and its corresponding end. ksh exit will cause the calling shell or shell script to exit with the exit status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the exit status is that of the last command executed. When exit occurs when executing a trap, the last command refers to the command that executed before the trap was invoked. An end-of-file will also cause the shell to exit except for a shell which has the ignoreeof option (See set below) turned on. return causes a shell function or '.' script to return to the invoking script with the return status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the return status is that of the last command executed. If return is invoked while not in a function or a '.' script, then it is the same as an exit. 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
break(1), csh(1), ksh(1), sh(1), attributes(5) SunOS 5.10 15 Apr 1994 exit(1)
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