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Re: Environment variable "PS4" can not be passed to bash script from version 4.2.46(2)

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  Re: Environment variable "PS4" can not be passed to bash script from version 4.2.46(2) Greg Wooledge <wooledg@eeg.ccf.org> - 2018-10-23 12:06 -0400

#14733 — Re: Environment variable "PS4" can not be passed to bash script from version 4.2.46(2)

On Tue, Oct 23, 2018 at 03:20:12PM +0000, Chen, Farrah wrote:
> But in Bash script, it cannot work, it keeps its original value:
> [root@fchen ~]# cat test.sh
> #!/usr/bin/bash
> echo $PS4
> echo $FAN

This is because you're doing it as root.  Bash strips PS4 from the
environment when started as root, as a security precaution.

wooledg:~$ PS4='hello' bash -c 'set -x; true'
hellotrue
wooledg:~$ sudo env PS4='hello' bash -c 'set -x; true'
[sudo] password for wooledg: 
+ true

Notice how it works as expected as a regular user, then "fails"
under sudo.

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