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# 1  
Old 01-25-2011
[:digit:]
Hi,

Does anybody know what the below means:

[:digit:]

I have a program containing the following and am trying to understand what it does:

Code:
temp=$(echo $count2 | tr -cd [:digit:])

Cheers
Paul

Moderator's Comments:
Mod Comment Please start using code tags
Last edited by pludi; 01-25-2011 at 07:35 AM..
# 2  
Old 01-25-2011
It's a POSIX character class that basically means "Any digit between 0 and 9".
# 3  
Old 01-25-2011
As for precisely what it does, it returns whatever digits are in the string "count2" to "temp". If count2 is "123AB45C6D" then temp would be "123456". To see why, type "man tr".
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