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Full Discussion: tell me how many specific characters there are?
Top Forums Shell Programming and Scripting tell me how many specific characters there are? Post 102301 by buffoonix on Friday 17th of March 2006 03:44:33 AM
Old 03-17-2006
If you have access to a GNU grep that will work.
However, grep implementations on most Unices lack the -o switch.
Besides, I would prefer the solution posted by Ygor since a tr
should be far more efficient (you could try benchmarking both methods).
At the moment when I posted the Perl tr stuff I completely forgot
about the complement switch.
So undoubtably Ygor's is far more elegant.
One should more often look at the manpages of those text processing utilities like tr.
 

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LEARN ABOUT HPUX

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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