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Full Discussion: Need help interpreting a function
Top Forums Shell Programming and Scripting Need help interpreting a function Post 302386599 by KenJackson on Tuesday 12th of January 2010 10:40:53 PM
Old 01-12-2010
Quote:
Originally Posted by Cheranime
Code:
        grep -i "$@" $FILENAME

There's a problem here. Suppose you call the function like this:
find_lines some words
The arguments of grep will be: "some" "words" "$FILENAME", but grep will interpret "words" a file, not a pattern to search for.
If you change it to "$*", then "some words" would be passed as one argument.


Also, you may want to add switch -q to grep to avoid printing the grep output.


I would rewrite the whole function like this:
Code:
function find_words()
{
    test -z "$1"  &&  return -1  ||  grep -q -i "$*" "$FILENAME"
}

 

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LEARN ABOUT REDHAT

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  is used to invoke the grep on compress'ed or gzip'ed files. All options specified are passed directly to grep.  If no file is speci-
       fied, 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  zgrep  is invoked as zegrep or zfgrep then egrep or fgrep is used instead of grep.  If the GREP environment variable is set, zgrep uses
       it as the grep program to be invoked. For example:

	   for sh:  GREP=fgrep	zgrep string files
	   for csh: (setenv GREP fgrep; zgrep string files)

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

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

																	  ZGREP(1)
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