Ques Post: 59003

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Top Forums Shell Programming and Scripting Ques Post 59003 by zazzybob on Tuesday 7th of December 2004 11:21:06 AM

12-07-2004

Registered User

Make sure you backslash escape the dot "." as it is a metacharacter (any char).

The code above will also match anything ending in an upper-case Z, e.g.

echo "something.ZAZZ" | grep '.Z$'
will match.

You need
echo "something.ZAZZ" | grep '\.Z$' (exit code 1)
echo "foo.log.Z" | grep '\.Z$' (exit code 0 - correct)

EDIT:

To get you on the right track. Let's assume you write a script, foo.sh. You call foo.sh something like this

$ ./foo.sh myfile

Where myfile can sometimes have a .Z extension.

Within your code, do something like (I've made this fairly verbose so you can see what's happening)

Code:

#!/bin/sh

inputfile=$1

echo "$inputfile" | grep '\.Z$' >/dev/null 2>&1
if [ "$?" -eq "0" ]; then
   # yay, it's been compressed
   zcat $inputfile | while read line
   do
     echo "Heres the line... $line"
   done
else
   # assume it's not compressed, you could check for .gz, etc
   while read line
   do
     echo "Heres the line... $line"
   done < $inputfile
fi

exit 0

This is untested, but should work.

Cheers
ZB

Last edited by zazzybob; 12-07-2004 at 12:31 PM..

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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)