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.
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