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Re: test if shell is interactive

From: Bob Proulx
Subject: Re: test if shell is interactive
Date: Sun, 22 Jan 2012 13:42:32 -0700
User-agent: Mutt/1.5.21 (2010-09-15)

tapczan wrote:
> Bob Proulx wrote:
> > Shell scripts are not interactive.  So what you are seeing above is
> > correct.
> So, is there any way to test if script (a.sh) was invoked from interactive
> session (human) or not (e.g. from cron)?

I usually check if the standard input file descriptor is attached to a
tty device or not.

  if [ -t 0 ]; then
    echo has a tty
    echo does not have a tty
  exit 0

Or something like:

  $ test -t 0 && echo yes tty || echo no tty

Note: This discussion thread is much better suited for help-bash since
it isn't talking about a bug in bash.  In the future if you are just
asking questions that would be the better list to send them to.


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