Check if script was started in current shell

Question

Is there a way to check within a shell script (ksh) whether or not the script was started in the current shell?

Example

Start script in current shell with . (dot/source) command

$ . ./myscript
$ I run in the current environment!

Start script in own process

$ ./myscript
$ I run in my own process!

@tripleee the post you mention stand for bash **and** ksh, while this post seem specific to ksh. — F. Hauri - Give Up GitHub, Apr 11 '14 at 11:43
The exact version of the korn shell being used is very relevant here. — Amit Naidu, Jul 25 '19 at 02:20

score 0 · Answer 1 · answered Apr 11 '14 at 07:08

0

This is a simple trick you can use.

#!/bin/ksh
if [ ${.sh.file} != ${0} ]; then
    echo I run in the current environment
else
    echo I run in my own process
fi

answered Apr 11 '14 at 07:08

alvits

`${.sh.file}` leads to error message `bad substitution` on my side. – TechnoCore Apr 14 '14 at 06:07
@TechnoCore - I realized you might not be using GNU `ksh`. You cam simply replace `.sh.file` with `_`. The statement will then be `if [ ${_} != ${0} ]; then`. – alvits Apr 14 '14 at 20:29

score 0 · Answer 2 · answered Apr 11 '14 at 08:20

0

Every Shell Has its Own PID ..

so you can use echo "$$" in ur script ..it will helps us find from where the Script is RAN .

i.e Difference in pid means they are run from different shells .

answered Apr 11 '14 at 08:20

pravin_23

2 Answers2