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Full Discussion: Simple (not for me) string search script
Top Forums Shell Programming and Scripting Simple (not for me) string search script Post 302520741 by mirni on Monday 9th of May 2011 05:35:32 AM
Old 05-09-2011
Hi and welcome to the forum and Unix community.
grep(1) is the tool you are looking for.
Code:
grep string1 text1.txt

will output all lines that contain 'string1'

grep is a filter -- it is line based. It reads in a line, does a search, and prints the line if found; and takes the next line to process.

You can use -A<num> option to get <num> lines After the match, like this:
Code:
grep -A3 string file

string to search for needs to be in double quotes if it contains spaces. Same for file. You can use variables, of course:
Code:
str="pattern to search for"
grep "$str" someFile.txt

Look at the manual pages to find about grep's options on your system.
Code:
man grep

 

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LEARN ABOUT POSIX

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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