Shell Programming and Scripting

I have to find out the file system location of the script file inside script. for example a script "abc.sh" placed anywhere in the file system when executed shold tell by itself the location of it.

example

#pwd
/
#./abc
this is /
#cd /root
#./abc
this is /root
#cd /
#/root/abc
this is /root

This should work.

Code:

[/tmp]$ cat pwd.ksh 
#! /bin/ksh

self="${0#./}"
base="${self%/*}"
current=$(pwd)

if [ "$base" = "$self" ] ; then
echo "$current"
else
echo "$current/$base"
fi ;

no it doesnt work

What doesnt work ?

Care to explain/show what is the output that you are getting ?

self="${0#./}"

The 0 you see is the digit 0 instead of the alphabet O

I see what you mean.

What you actually need is the contents of /proc/pid/exe. But in your case since you need the actual path of script that is run, /proc/pid/exe it wouldnt help because, the shell i.e. /bin/sh or /bin/ksh or /bin/bash et al., picks up your script and runs it. So a /proc/pid/exe inside a script would give you /bin/sh or /bin/ksh likewise.

What you can do is analyze $0 and see if it is a path starting from / and gets its basename. Else use it along with pwd of the current directory.

you are using $0 which is what is used to execute that script, if i used

../../../abc.sh such things are appearing the result. i want direct path

Code:

[/tmp]$ cat pwd.ksh 
#! /bin/ksh

self="${0#./}"
base="${self%/*}"
current=$(pwd)

if [ "$base" = "$self" ] ; then
{ cd "$current" ; echo $(pwd) ;}
else
{cd $current/$base ; echo $(pwd) ; }
fi ;