How to unset environment variables from script

Question

if I need to unset an environment variable from script it used to be "sourced" like

. ./myscript.sh

or

source ./myscript.sh

But how do i make this work, if i launch this script from supervisord?

[program:myapp]
command=source /usr/bin/myscript.sh
...

does not work.

Simple example script (myscript.sh):

#!/bin/bash
unset -v SOME_VAR

That's all ...

Why don't you post the content of you script, starting with the missing interpreter — Jacob Evans, Nov 28 '17 at 15:48
I bet `command=/usr/bin/bash -c "source /usr/bin/myscript.sh"` works. — Jacob Evans, Nov 28 '17 at 15:51
sure execution works fine, but 'unset' of environment vars doesn't — David, Nov 28 '17 at 16:52

score 2 · Answer 1 · answered Nov 28 '17 at 11:02

2

You wouldn't generally /run/ a script by using source, instead you'd make it executable and then run it using it's path.

However, to specifically unset a variable just use unset:

$ TEST=foo
$ echo $TEST
foo
$ unset TEST
$ echo $TEST

$

answered Nov 28 '17 at 11:02

shearn89

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Sorry, but this is not what I asked for. I know how to unset vars from command-line. Instead I am looking for a way to unset vars from within a script. Therefore the . (or source) is normally the best practice. – David Nov 28 '17 at 13:36
It's the same thing... – Jacob Evans Nov 28 '17 at 15:47
Sorry, Jacob but this is not true! – David Nov 28 '17 at 16:57

score 1 · Answer 2 · answered Oct 31 '19 at 08:41

It works for me.

root@localhost:~# cat set.sh
hello1=world1
hello2=world2

root@localhost:~# cat unset.sh
unset hello1
unset hello2

root@localhost:~# . set.sh
root@localhost:~# env | grep ^hello
hello1=world1
hello2=world2
root@localhost:~# . unset.sh
root@localhost:~# env | grep ^hello
root@localhost:~#

How to unset environment variables from script

2 Answers2