how can i compare te length of the string


 
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# 1  
Old 09-15-2008
how can i compare te length of the string

how can i campare te length of the string

$var = unix

if ( $var -eq 4 )

then..

is it right
# 2  
Old 09-15-2008
Code:
var="UNIX"

if [ ${#var} -eq 4 ]; then
  # do something
fi

For basic usage like this you really should look at the appropriate man pages or tutorials.
# 3  
Old 09-15-2008
Code:
if [ `printf $var|wc -c` -eq 4 ];then echo "4"; fi

# 4  
Old 09-16-2008
ghostdog74: If $var contains whitespace or special characters, it needs to be double-quoted. The solution posted by Franklin52 seems more succinct and workable anyway; the built-in ${#var} length operator doesn't require any external processes, and doesn't have issues with quoting etc.
# 5  
Old 09-16-2008
true, then put quotes. anyway, its good practice too
Code:
if [ `printf "$var"|wc -c` -eq 4 ];then echo "4"; fi

this method should work on most shells, including bourne, csh
# 6  
Old 09-16-2008
Actually I believe the syntax for csh is different.
# 7  
Old 09-16-2008
Quote:
Originally Posted by era
Actually I believe the syntax for csh is different.
my bad. what i meant is the way to get length, not the if/else.
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