Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Modify existing values in a file

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Modify existing values in a file
# 8  
Old 04-22-2014
I have tried below code and it is working but it is failing where there is no "kernel.shmall" parameter in file /etc/sysctl.conf
Code:
if grep -o "kernel.shmall" /etc/sysctl.conf > /dev/null
      then
            oldvalue=$(grep -v '^#' /etc/sysctl.conf|grep kernel.shmall|sed 's/=/ /g'| awk '{ print $2}')
      
            if [ $oldvalue -lt 4194304 ]
            then
               sed -i "s|\("kernel.shmall" *= *\).*|\14194304|" /etc/sysctl.conf
            fi
       else
           echo "kernel.shmall=" >> /etc/sysctl.conf
           sed -i "s|\("kernel.shmall" *= *\).*|\14194304|" /etc/sysctl.conf
      fi

is there any modifications do i need to do in script to add "kernel.shmall=4194304" value to file sysctl.conf where there is no parameter kernel.shmall
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Pattern search and modify the values

I have one file and the file may contain 500 to 15,000 records. I need to search pattern ^F509= and then increment the corresponding value by one and print the entire line. Please note that Its not a fixed length file. Can anyone please help? ex: ^F509=204656 ^F509=204656 ... (6 Replies)
Discussion started by: vinus
6 Replies

2. Shell Programming and Scripting

Need to implement new CRON job or modify the existing one in MDM PROD in coming days, which will sen

Need to implement new CRON job or modify the existing one in MDM PROD in coming days, which will send email of SQL statement running from past 1 minute.Currently there is one CRON job in PROD, which send below email. there is one cron job which send email, when there is long running... (0 Replies)
Discussion started by: dampu
0 Replies

3. Shell Programming and Scripting

Adding columns with values dependent on existing columns

Hello I have a file as below chr1 start ref alt code1 code2 chr1 18884 C CAAAA 2 0 chr1 135419 TATACA T 2 0 chr1 332045 T TTG 0 2 chr1 453838 T TAC 2 0 chr1 567652 T TG 1 0 chr1 602541 ... (2 Replies)
Discussion started by: plumb_r
2 Replies

4. Shell Programming and Scripting

how to modify existing env var

greetings, i have the following env variable: LSB_HOSTS='t70cra102 t70cra102 t70cra108 t70cra108'the variable could be any number of host names and sometimes the same name several times. i was hoping there's a way to turn it into the following: NEW_LSB_HOSTS=,,,]always appreciate the help... (2 Replies)
Discussion started by: crimso
2 Replies

5. Shell Programming and Scripting

modify a file by inserting a conditional values

Hi, input file CCCC 1204 215764.85 9405410.40 1189 DDDD 4498 1503 4617 1507 4723 1517 4829 1528 4996 1540 DDDD 5199 1556 5278 1567 5529 1603 5674 1614 6076 1915 DDDD 6605 2371 7004 2779 CCCC ... (4 Replies)
Discussion started by: Indra2011
4 Replies

6. Shell Programming and Scripting

modify Existing MS excel workbook in perl

Hi I need to modify an excel file in perl and for which I installed perl in Linux 1. Open a existing excel file 2. delete an unwanted Sheet called "summary" 3. and i want to insert some data into range of cells ( B1:B11) 4. Remove unwanted value called "Sum" repeated in the... (1 Reply)
Discussion started by: luke_devon
1 Replies

7. Shell Programming and Scripting

insert pipes for existing and non-existing records

I have a source file like this, L4058S462 34329094 F51010141TK1070000483L4058S462 34329094 0232384840 381892 182 5690 L4058S462 34329094 F51020141FIRST CLEARING, LLC A/C 3432-9094 L4058S462 34329094 F51030141JOHAN HOLMQVIST ... (1 Reply)
Discussion started by: saravanamr
1 Replies

8. Solaris

Add existing user into an existing group

Pre: no gpasswd/adduser there is just usermod can be used, also there is no -a option for usermod. How should I add a user into a group? (4 Replies)
Discussion started by: a2156z
4 Replies

9. Shell Programming and Scripting

folder existing and file existing

I want to look into a folder to see if there are any folders within it. If there are, I need to check inside each folder to see if it contains a .pdf file So If /myserver/myfolder/ contains a folder AND that folder conatins a .pdf file do X Else do Z I may have multiple folders and... (4 Replies)
Discussion started by: crowman
4 Replies

10. UNIX for Advanced & Expert Users

How to modify an existing pdf with unix shell commands

Hi, I know that to create a pdf file I can use the txt2pdf command. But if I would change an existing pdf file, by inserting lines in particular positions of this file, what can I use? And How? (3 Replies)
Discussion started by: fandwick
3 Replies
Login or Register to Ask a Question

LEARN ABOUT DEBIAN

shunit2

SHUNIT2(1)																SHUNIT2(1)

NAME

       shunit2 - A unit test framework for shell scripts

SYNOPSIS

       shunit2 unitfile

DESCRIPTION

       shUnit2 is a xUnit unit test framework for Bourne based shell scripts, and it is designed to work in a similar manner to JUnit, PyUnit,
       etc.. If you have ever had the desire to write a unit test for a shell script, shUnit2 can do the job.

       You can either run shunit2 directly from the commandline and specify the unit file or directly source the shunit2 executable.

       If you directly execute shunit2 and don't specify a unitfile shunit2 assumes a empty testfile and will return without an error message.

EXAMPLE

       Simple script to test if 1 equals 1

	   #! /bin/sh
	   testEquality()
	   {
	     assertEquals 1 1
	   }

	   # load shunit2
	   . shunit2

       Execute shUnit2 unit tests directly from the commandline

	   shunit2 /path/to/unit/file

OPTIONS

       shunit2 does not support any commandline options at all. You can either source shunit2 to execute your unit tests or directly run shunit2
       as a commandline script.

SEE ALSO

       For more information see http://code.google.com/p/shunit2/ or have a look at the installed documentation in /usr/share/doc/shunit2/

AUTHOR

       shunit2 was written by Kate Ward <kate.ward@forestent.com>. This manpage was written by Ulrich Dangel <mru@spamt.net>.

  2.1.6 							    03/25/2012								SHUNIT2(1)