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Shell Programming and Scripting

An urgent assistance

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# 1  
Old 10-30-2009
An urgent assistance
Hi.
Does any one know when the below will print hi ?
Code:
[ -t 0 ] || echo hi

Thanks in advance
Last edited by pludi; 10-30-2009 at 07:16 AM.. Reason: code tags, please...
# 2  
Old 10-30-2009
It belongs to which shell and which script..
# 3  
Old 10-30-2009
Very simple way to test: enter it in your terminal emulation / console.
# 4  
Old 10-30-2009
Code:
man test :

  -t [fildes]    True if the open file whose file descriptor number
                          is fildes (1 by default) is associated with a
                          terminal device.

# 5  
Old 10-30-2009
Quote:
Originally Posted by kinny
Hi.
Does any one know when the below will print hi ?
Code:
[ -t 0 ] || echo hi

Thanks in advance
If standard output is NOT connected to a terminal echo hi.
# 6  
Old 10-30-2009
It will print "hi" when there is no terminal (e.g. from "cron" or "at").

Quick test if you have permissions to use "at":

Code:
at now
[ -t 0 ] || echo hi
ctrl/D

Result is in unix mail for the user submitting the "at" job.
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