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Full Discussion: Maintain full path of a script in a var when sourcing it from a different script
Top Forums Shell Programming and Scripting Maintain full path of a script in a var when sourcing it from a different script Post 302176957 by mrbluegreen on Wednesday 19th of March 2008 05:20:34 PM
Old 03-19-2008
Hi Jim, thanks for the reply.

I make some change directory calls inside a.sh, so that the pwd becomes dirname ${0}. The problem I think is that, I'm not invoking a.sh, but sourcing it inside b.sh:

Code:
#!/bin/sh
. /one/two/a.sh

echo $A_DIR

Let's say I invoke b.sh with the following:

/hello/bye/b.sh

Because a.sh makes the following call: dirname ${0}. It gets the path of the current value inside $0, which is actually "/hello/bye/b.sh", since that script is the one being actually invoked.
 

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LEARN ABOUT SUNOS

basename

basename(1)							   User Commands						       basename(1)

NAME

       basename, dirname - deliver portions of path names

SYNOPSIS

       /usr/bin/basename string [suffix]

       /usr/xpg4/bin/basename string [suffix]

       dirname string

DESCRIPTION

       The  basename  utility deletes any prefix ending in / and the suffix (if present in string) from string, and prints the result on the stan-
       dard output. It is normally used inside substitution marks (``) within shell procedures.

   /usr/bin
       The suffix is a pattern defined on the expr(1) manual page.

   /usr/xpg4/bin
       The suffix is a string with no special significance attached to	any of the characters it contains.

       The dirname utility delivers all but the last level of the path name in string.

EXAMPLES

       Example 1: Setting environment variables

       The following example, invoked with the argument /home/sms/personal/mail sets the environment variable NAME to the file named mail and  the
       environment variable MYMAILPATH to the string  /home/sms/personal:

       example% NAME=`basename $HOME/personal/mail`
       example% MYMAILPATH=`dirname $HOME/personal/mail`

       Example 2: Compiling a file and moving the output

       This  shell  procedure,	invoked  with  the argument /usr/src/bin/cat.c, compiles the named file and moves the output to cat in the current
       directory:

       example% cc $1
       example% mv a.out `basename $1 .c`

ENVIRONMENT VARIABLES

       See environ(5) for descriptions of the following environment variables that affect  the execution of basename and  dirname:  LANG,  LC_ALL,
       LC_CTYPE, LC_MESSAGES, and NLSPATH.

EXIT STATUS

       The following exit values are returned:

       0	Successful completion.

       >0	An error occurred.

ATTRIBUTES

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

   /usr/bin
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

   /usr/xpg4/bin
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWxcu4			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       expr(1), basename(3C), attributes(5), environ(5), standards(5)

SunOS 5.10							    18 Mar 1997 						       basename(1)
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