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Full Discussion: How to find a string in a line in UNIX file and delete that line and previous 3 lines ?
Top Forums UNIX for Advanced & Expert Users How to find a string in a line in UNIX file and delete that line and previous 3 lines ? Post 302902014 by drl on Saturday 17th of May 2014 11:33:16 AM
Old 05-17-2014
Hi.

A grep relative, cgrep, can do this:
Code:
#!/usr/bin/env bash

# @(#) s1	Demonstrate match+previous 3, then invert to delete; cgrep.
# See: http://sourceforge.net/projects/cgrep/

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
LC_ALL=C ; LANG=C ; export LC_ALL LANG
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C column cgrep

FILE=${1-data1}

pl " Input data file $FILE (columnized):"
column $FILE

pl " Results:"
cgrep -D -V -3 fig $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 5.0.8 (lenny, workstation) 
bash GNU bash 3.2.39
column - ( /usr/bin/column, 2007-11-20 )
cgrep ATT cgrep 8.15

-----
 Input data file data1 (columnized):
apple		date		kiwi		nectarine	rhubarb
banana		fig		lemon		orange
cherry		grape		mango		peach

-----
 Results:
apple
grape
kiwi
lemon
mango
nectarine
orange
peach
rhubarb

See sourceforge page for details. It will need to be compiled, but I had no trouble with that.

Best wishes ... cheers, drl
 

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LEARN ABOUT LINUX

column

COLUMN(1)						    BSD General Commands Manual 						 COLUMN(1)

NAME

     column -- columnate lists

SYNOPSIS

     column [-ntx] [-c columns] [-s sep] [file ...]

DESCRIPTION

     The column utility formats its input into multiple columns.  Rows are filled before columns.  Input is taken from file operands, or, by
     default, from the standard input.	Empty lines are ignored.

     The options are as follows:

     -c      Output is formatted for a display columns wide.

     -s      Specify a set of characters to be used to delimit columns for the -t option.

     -t      Determine the number of columns the input contains and create a table.  Columns are delimited with whitespace, by default, or with
	     the characters supplied using the -s option.  Useful for pretty-printing displays.

     -x      Fill columns before filling rows.

     -n      By default, the column command will merge multiple adjacent delimiters into a single delimiter when using the -t option; this option
	     disables that behavior. This option is a Debian GNU/Linux extension.

ENVIRONMENT

     The COLUMNS, LANG, LC_ALL and LC_CTYPE environment variables affect the execution of column as described in environ(7).

EXIT STATUS

     The column utility exits 0 on success, and >0 if an error occurs.

EXAMPLES

	   (printf "PERM LINKS OWNER GROUP SIZE MONTH DAY " ; 
	   printf "HH:MM/YEAR NAME
" ; 
	   ls -l | sed 1d) | column -t

SEE ALSO

     colrm(1), ls(1), paste(1), sort(1)

HISTORY

     The column command appeared in 4.3BSD-Reno.

BUGS

     Input lines are limited to LINE_MAX (2048) bytes in length.

BSD
								   July 29, 2004							       BSD
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