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question about wc

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Top Forums Shell Programming and Scripting question about wc
# 15  
Old 05-10-2006
Quote:
Originally Posted by yodadbl07
Code:
set dif = `tr -d '.:"(),-' < $filename | tr '[A-Z]' '[a-z]' | tr ' ' '\n' | sort | uniq | wc -l`

So many tr's, pipes, combination of sort+uniq.

See if this works.

Code:
tr -cs '[:alnum:]' '[\n*]' < test.c | sort -u | wc -l

# 16  
Old 05-10-2006
Code:
 libra% tr -cs '[:alnum:]' '[\n*]' < testfile.txt | sort -u | wc -l
     165

vs.
Code:
libra% tr -d '.:"(),-' < testfile.txt | tr '[A-Z]' '[a-z]' | tr ' ' '\n' | sort | uniq | wc -l
     159

what does the
Quote:
'[:alnum:]'
do?
# 17  
Old 05-10-2006
'[:alnum:]' doesnt do anything. Rather, it is a character class for alphabets and numbers.

See info -f coreutils --index-search='Character classes'
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