Sponsored Content
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
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

find previous line, next line on solaris

Hi, Unlike the GNU version, grep on SunOS doesn't have the switches -B and -A to fetch me the lines before n after the match and looking for an alternate way. Any Suggestions?. -Anduzzi (1 Reply)
Discussion started by: anduzzi
1 Replies

2. Shell Programming and Scripting

How to use sed to search for string and Print previous two lines and current line

Hello, Can anybody help me to correct my sed syntax to find the string and print previous two lines and current line and next one line. i am using string as "testing" netstat -v | sed -n -e '/test/{x;2!p;g;$!N;p;D;}' -e h i am able to get the previous line current line next line but... (1 Reply)
Discussion started by: nmadhuhb
1 Replies

3. Shell Programming and Scripting

Unix help to find blank lines in a file and print numbers on that line

Hi, I would like to know how to solve one of my problems using expert unix commands. I have a file with occasional blank lines; for example; dertu frthu fghtu frtty frtgy frgtui frgtu ghrye frhutp frjuf I need to edit the file so that the file looks like this; (10 Replies)
Discussion started by: Lucky Ali
10 Replies

4. Shell Programming and Scripting

Find pattern a delete previous 5 lines

Hi guys, i have the follow problem i need to delete 10 row before the pattern and 1 after and the pattern row itself. file looks like: frect 9.8438 25.8681 10.625 25 . dynprop \ (# \ (call fox_execute(__self))) \ (FOX_VAR_29 \ ... (4 Replies)
Discussion started by: EjjE
4 Replies

5. Shell Programming and Scripting

Grep a string from input file and delete next three lines including the line contains string in xml

Hi, 1_strings file contains $ cat 1_strings /home/$USER/Src /home/Valid /home/Review$ cat myxml <projected value="some string" path="/home/$USER/Src"> <input 1/> <estimate value/> <somestring/> </projected> <few more lines > <projected value="some string" path="/home/$USER/check">... (4 Replies)
Discussion started by: greet_sed
4 Replies

6. Shell Programming and Scripting

Delete line with match and previous line quoting/escaping problem

Hi folks, I've list of LDAP records in this format: cat cmmac.export.tmp2 dn: deviceId=0a92746a54tbmd34b05758900131136a506,ou=devices,ou=customer,ou=nl,o=upc cmmac: 00:13:11:36:a5:06 dn: deviceId=0a92746a62pbms4662299650015961cfa23,ou=devices,ou=customer,ou=nl,o=upc cmmac:... (4 Replies)
Discussion started by: tomas.polak
4 Replies

7. Shell Programming and Scripting

Sed find exact string and delete line with variable

All, I am trying to read in a variable and search a file then delete based on that string, but i want to match exact word. This works but it matches all, i don't want to match anthing that contains the string, just the exact string. sed -i "/$feedname/d" file I tried sed... (1 Reply)
Discussion started by: markdjones82
1 Replies

8. Shell Programming and Scripting

Remove previous line if next & previous lines have same 4th character.

I want to remove commands having no output. In below text file. bash-3.2$ cat abc_do_it.txt grpg10so>show trunk group all status grpg11so>show trunk group all status grpg12so>show trunk group all status GCPKNYAIGT73IMO 1440 1345 0 0 94 0 0 INSERVICE 93% 0%... (4 Replies)
Discussion started by: Raza Ali
4 Replies

9. Shell Programming and Scripting

Delete all lines except a line starting with string

Shell : bash OS : RHEL 6.8 I have a file like below. $ cat pattern.txt hello txt1 txt2 txt3 some other text txt4 I want to remove all lines in this file except the ones starting with txt . How can I do this ? (4 Replies)
Discussion started by: omega3
4 Replies

10. Shell Programming and Scripting

How to find string and delete before just in line?

Hello, When my lines contain question mark, I use below command to delete the portion of the matching line coming after question mark: sed 's/?.*//' SampleFile SampleFile: helloworldfirstline?mdksmyymsss hellosecondlineworld?mdksmkkmsss thirdhelloworld?mdksmccmsss Output:... (2 Replies)
Discussion started by: baris35
2 Replies
env(1)								   User Commands							    env(1)

NAME
env - set environment for command invocation SYNOPSIS
/usr/bin/env [-i | -] [name=value]... [utility [arg... ]] /usr/xpg4/bin/env [-i | -] [name=value]... [utility [arg... ]] DESCRIPTION
The env utility obtains the current environment, modifies it according to its arguments, then invokes the utility named by the utility op- erand with the modified environment. Optional arguments are passed to utility. If no utility operand is specified, the resulting environment is written to the standard output, with one name=value pair per line. /usr/bin If env executes commands with arguments, it uses the default shell /usr/bin/sh (see sh(1)). /usr/xpg4/bin If env executes commands with arguments, it uses /usr/xpg4/bin/sh (see ksh(1)). OPTIONS
The following options are supported: -i | - Ignores the environment that would otherwise be inherited from the current shell. Restricts the environment for utility to that specified by the arguments. OPERANDS
The following operands are supported: name=value Arguments of the form name=value modify the execution environment, and are placed into the inherited environment before utility is invoked. utility The name of the utility to be invoked. If utility names any of the special shell built-in utilities, the results are unde- fined. arg A string to pass as an argument for the invoked utility. EXAMPLES
Example 1 Invoking utilities with new PATH values The following utility: example% env -i PATH=/mybin mygrep xyz myfile invokes the utility mygrep with a new PATH value as the only entry in its environment. In this case, PATH is used to locate mygrep, which then must reside in /mybin. ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of env: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, and NLSPATH. PATH Determine the location of the utility. If PATH is specified as a name=value operand to env, the value given shall be used in the search for utility. EXIT STATUS
If utility is invoked, the exit status of env is the exit status of utility. Otherwise, the env utility returns one of the following exit values: 0 Successful completion. 1-125 An error occurred. 126 utility was found but could not be invoked. 127 utility could not be found. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: /usr/bin +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |enabled | +-----------------------------+-----------------------------+ /usr/xpg4/bin +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWxcu4 | +-----------------------------+-----------------------------+ |CSI |enabled | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
ksh(1), sh(1), exec(2), profile(4), attributes(5), environ(5), standards(5) SunOS 5.11 2 Jan 2002 env(1)
All times are GMT -4. The time now is 07:40 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy