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Old 12-24-2004, 08:11 PM   #1
john8675309
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Registered: Oct 2003
Location: Spencer, Iowa
Distribution: Slackware (of course)
Posts: 67

Rep: Reputation: 16
Bash Scripting Empty file


How can I detect if a file is empty using bash?

--John
 
Old 12-24-2004, 08:18 PM   #2
bulliver
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Registered: Nov 2002
Location: Edmonton AB, Canada
Distribution: Gentoo x86_64; Gentoo PPC; FreeBSD; OS X 10.9.4
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Code:
if [ ! -s $file ]
    print "$file is empty"
else
    print "$file has content"
fi

Last edited by bulliver; 12-24-2004 at 08:20 PM.
 
Old 08-08-2007, 04:05 PM   #3
fvu
LQ Newbie
 
Registered: Nov 2006
Distribution: Ubuntu 7.10
Posts: 28

Rep: Reputation: 15
1. `then' is missing
2. `print' should be `echo':

Code:
file=/etc/passwd
if [ ! -s $file ]; then
    echo "$file is empty"
else
    echo "$file has content"
fi
You can even use a one-liner:

Code:
file=/etc/passwd
[ -s $file ] && echo "$file has content" || echo "$file is empty"
Freddy Vulto
http://fvue.nl/wiki/Bash
 
  


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