combine -A and -v in grep Post: 302411143

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Top Forums UNIX for Dummies Questions & Answers combine -A and -v in grep Post 302411143 by drl on Wednesday 7th of April 2010 07:17:24 PM

04-07-2010

Registered User

Hi.

A nonstandard command, cgrep, often works where grep does not:

Code:

#!/usr/bin/env bash

# @(#) s1	Demonstrate cgrep.
# http://www.bell-labs.com/project/wwexptools/cgrep/
# http://sourceforge.net/projects/cgrep/

# Test run as external user.
# export PATH="/usr/local/bin:/usr/bin:/bin"
# Infrastructure details, environment, commands for forum posts. 
set +o nounset
LC_ALL=C ; LANG=C ; export LC_ALL LANG
echo ; echo "Environment: LC_ALL = $LC_ALL, LANG = $LANG"
echo "(Versions displayed with local utility \"version\")"
c=$( ps | grep $$ | awk '{print $NF}' )
version >/dev/null 2>&1 && s=$(_eat $0 $1) || s=""
[ "$c" = "$s" ] && p="$s" || p="$c"
version >/dev/null 2>&1 && version "=o" $p specimen grep cgrep
set -o nounset
echo

FILE=${1-data1}

# Sample file, with head & tail as a last resort.
specimen $FILE \
|| { echo "(Using head/tail)" ; head -5 $FILE ; echo " --" ; tail -5 $FILE; }

echo
echo " Results, expect failure:"
grep -A1 -v Z $FILE

echo
echo " Results, cgrep:"
cgrep -D -V  +1 Z $FILE

exit 0

producing:

Code:

% ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0 
GNU bash 3.2.39
specimen (local) 1.15
GNU grep 2.5.3
cgrep - (local: ~/executable/cgrep May 29 2009 )

Whole: 5:0:5 of 10 lines in file "data1"
A 
13
Z 
23
F
22
Z
413
R 
16

 Results, expect failure:
A 
13
Z 
23
F
22
Z
413
R 
16

 Results, cgrep:
A 
13
F
22
R 
16

You will need to download and compile the program. I did that a few years ago in 32-bit mode with success. Recently I used 64-bit mode, also successfully.

The documentation is longish, but includes examples. The options are complex.

I used the code from the Bell Labs site, but connections recently have been rejected. I know that the sourceforge version compiles, but I have not tested it.

Good luck ... cheers, drl

drl

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LEARN ABOUT SUNOS

noecho

echo(3XCURSES)						  X/Open Curses Library Functions					    echo(3XCURSES)

NAME

       echo, noecho - enable/disable terminal echo

SYNOPSIS

       cc [ flag... ] file... -I /usr/xpg4/include -L /usr/xpg4/lib 
       -R /usr/xpg4/lib -lcurses [ library... ]

       c89 [ flag... ] file... -lcurses [ library... ]

       #include <curses.h>

       int echo(void);

       int noecho(void);

DESCRIPTION

       The  echo()  function enables Echo mode for the current screen. The noecho() function disables Echo mode for the current screen. Initially,
       curses software echo mode is enabled and hardware echo mode of the tty driver is disabled. The echo() and noecho() functions control  soft-
       ware echo only. Hardware echo must remain disabled for the duration of the application, else the behavior is undefined.

RETURN VALUES

       Upon successful completion, these functions return OK. Otherwise, they return ERR.

ERRORS

       No errors are defined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       getch(3XCURSES), getstr(3XCURSES), initscr(3XCURSES), libcurses(3XCURSES), scanw(3XCURSES), attributes(5), standards(5)

SunOS 5.10							    5 Jun 2002							    echo(3XCURSES)

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