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Old 10-21-2002, 11:35 AM   #1
Registered: Nov 2001
Location: Sweden
Distribution: GNU/Linux since -97
Posts: 149

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Question Simple console question

Hi, just playing around with the test thing

Lets say I want to check if file /bin/ls exists

This could be done with 'test -e /bin/ls'
and it should give me False or True but it gives me nothing

Really strange

Does anyone know what the problem is ?

Old 10-21-2002, 12:13 PM   #2
Registered: Nov 2001
Location: London, England
Distribution: Gentoo, FreeBSD
Posts: 590

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test -e /bin/ls ; print $?

test does return 1 or 0 (i.e. True or False), but remember a program doesn't print what it returns - it prints what it outputs to stdout or stderr. $? holds the return value of the last command executed. Commands return 0 on success and 1 on failure, so if test returns 0 this means the file exists.


Last edited by llama_meme; 10-21-2002 at 12:16 PM.
Old 10-21-2002, 01:35 PM   #3
Registered: Nov 2001
Location: Sweden
Distribution: GNU/Linux since -97
Posts: 149

Original Poster
Rep: Reputation: 15

test -e /bin/ls ; print $? dont work for me but

test -e /bin/ls ; echo $? did

Thanks :-)

Old 10-21-2002, 03:29 PM   #4
Registered: Jul 2002
Location: Santa Cruz, CA
Distribution: lfs
Posts: 538

Rep: Reputation: 30
I think

[ -e /bin/ls ] ; echo $?

should do the same, or you could just do

ls /bin | grep ls


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