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Top Forums Shell Programming and Scripting AIX equivalent to GNU grep's -B and -A [print lines after or before matching lines] Post 302417069 by ahmad.diab on Wednesday 28th of April 2010 11:52:36 AM
Old 04-28-2010
Using PERL -s option will allow you to emulate the GNU grep function as below:-

cat perlgrep

Code:
#!/bin/perl -s -wln 

our ( $A , $B , $pattern ) ;

        BEGIN{
                defined $A or $A=0 ; defined $B or $B=0 ; defined $pattern or warn "Pattern Not Exists, kindly insert Pattern $!;" and exit 255 ;
        }

                        $FLINE{$.}=$_ ;

                        /$pattern/ and   $match=$. ;

        END{

                         $b = $match - $B ;
                         $a = $match + $A ;

                while ( $b < $match) {
                        print $FLINE{$b} ;
                        $b++ ;
                }

                print $FLINE{$match} ;

                while ( $a > $match ) {
                        print $FLINE{++$match};

                }
        }

in command user prompt write the below:-
Code:
bash-3.00$ chmod u+x perlgrep
bash-3.00$ perlgrep -A=2 -B=4 -pattern='FATAL|QUEUE|SIGHUP' infile.txt

SmilieSmilieSmilieSmilieSmilieSmilie

Last edited by ahmad.diab; 04-28-2010 at 12:58 PM..
 

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Tcl_StringMatch(3)					      Tcl Library Procedures						Tcl_StringMatch(3)

__________________________________________________________________________________________________________________________________________________

NAME
Tcl_StringMatch, Tcl_StringCaseMatch - test whether a string matches a pattern SYNOPSIS
#include <tcl.h> int Tcl_StringMatch(str, pattern) int Tcl_StringCaseMatch(str, pattern, flags) ARGUMENTS
const char *str (in) String to test. const char *pattern (in) Pattern to match against string. May contain special characters from the set *?[]. int flags (in) OR-ed combination of match flags, currently only TCL_MATCH_NOCASE. 0 specifies a case-sensitive search. _________________________________________________________________ DESCRIPTION
This utility procedure determines whether a string matches a given pattern. If it does, then Tcl_StringMatch returns 1. Otherwise Tcl_StringMatch returns 0. The algorithm used for matching is the same algorithm used in the string match Tcl command and is similar to the algorithm used by the C-shell for file name matching; see the Tcl manual entry for details. In Tcl_StringCaseMatch, the algorithm is the same, but you have the option to make the matching case-insensitive. If you choose this (by passing TCL_MATCH_NOCASE), then the string and pattern are essentially matched in the lower case. KEYWORDS
match, pattern, string Tcl 8.5 Tcl_StringMatch(3)
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