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Re: How can a script know whether it is directly called in a terminal?
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From: |
Greg Wooledge |
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Subject: |
Re: How can a script know whether it is directly called in a terminal? |
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Date: |
Wed, 25 Mar 2020 08:30:37 -0400 |
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User-agent: |
Mutt/1.10.1 (2018-07-13) |
On Wed, Mar 25, 2020 at 01:54:14PM +0900, Koichi Murase wrote:
> 2020/3/23 2:47 Peng Yu
> > I'd like to know within a script whether it is called directly by
> > someone at the terminal.
I'd ask "why", but....
> I guess you want to test whether the script is directly called by an
> interactive session of shells. If you want to check if the parent
> process is the session leader or not, you can compare PPID with its
> SID. [...]
There's a decent chance that they want something from:
https://mywiki.wooledge.org/BashFAQ/109
It's also possible that they simply want to implement a command that
changes behavior when stdout is a terminal. In that case, test -t 1
is the thing.