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Determining absolute PATH within KSH script


 
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# 1  
Old 06-13-2002
Determining absolute PATH within KSH script

Hey everyone,

I'd like to determine the absolute path of where a script resides from within the same script. For example, I have a script - /tmp/myscript. Regardless of how that script is call - '/tmp/myscript', 'cd /tmp;./myscript', '. /tmp/myscript' - I'd like to be able to determine - from within 'myscript' - that it's located in '/tmp'.

I've tried combinations of ${PWD}, ${0}, ~+, but nothing has worked, esp. when sourcing the script.

Any ideas will be GREAT appreciated (I've spent almost a day trying to figure this out).

Thanks.
# 2  
Old 06-13-2002
If it has to work all the time, it's impossible. There is no hope with something like:
cat /tmp/myscript | ksh
There is also no hope when sourcing the file.

$0 should work in most other cases, in fact, I can't think of another case where it fails. If $0 is a relative path, you may want to tranform it into a absolute path.

It is low-tech, but you could put a line:
MYPATH=/tmp/myscript
in the script. If the script is running as root, the script can invoke fuser on MYPATH and verify that the current process at least has the file open.
# 3  
Old 06-13-2002
That - it's impossible - is what I've been afraid of. And am surprised about - I really thought I'd find something. I have made something work up to this point using a combination of ${PWD} and ${0} but sourcing screwed that up.

I'm trying to stay away from hardcoding anything with regards to the parent path so that I can have "production" and "dev" copies of scripts with identical subdirectory structures.

Anyway, thanks for the reply.
# 4  
Old 06-14-2002
The following works fine for me on hp/ux - ksh:


if [[ $0 != "/"* ]]; then
myPath=`pwd`
else
myPath=`dirname $0`
fi
echo $myPath


Maybe I missed something Smilie
# 5  
Old 06-14-2002
Thanks for the reply. I do appreciate the input. One problem with the code though - trying sourcing the script and you'll get the directory you sourced the script from and not the directory the script is in. For example:

cd /home/myhome
. /tmp/myscript
myPath = /home/myhome
# 6  
Old 06-14-2002
Oops you are right: when sourcing my script, the os sees only -ksh as $0 during execution, w/o any $1 etc.... Smilie

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