Re: While loop and stdin

[Mohammad Akhlaghi]

Thanks a lot Greg and Dennis,

The problem is much more clear for me now! Greg's link [1] in particular 
was very informative; thanks!

Having reviewed your points carefully, and also thinking about the 
behavior of other programs on the command line (for example AWK), in [2] 
I have modified the behavior of the problematic Gnuastro program: until 
now it would read standard input, even if a file was given as an input 
argument! From now on, it will only check standard input when no input 
file is given on the command-line.

This problem should therefore not happen any more for that program.

Thanks again for the prompt help :-)
Cheers,
Mohammad

[1] https://mywiki.wooledge.org/BashFAQ/089
[2] https://git.savannah.gnu.org/cgit/gnuastro.git/commit/?id=5c7c0b784a2