bash find line and replace howto -

bash find line and replace howto

First find the line number:

awk '/what you are searching for/{ print NR; exit }' input-file

86

Now use sed to replace it:

sed -i  86s/.*/"your replacement text"/ $file

 

Here is a full sample script to automate it:

file=some/file.txt
linenum=`awk /'your search query/{ print NR; exit }' $file`
newline=`echo -e "your new line here")`
sed -i "$linenum"s/.*/"$newline"/ $file


  • Prevent SSH Bruteforce and Hacks By Disabling Password Authentication
  • SMF Forums / Simple Machines Forums Not Displaying Images Theme or Styles Properly using 127.0.0.1
  • solution mysqldump: Got error: 1044: Access denied for user 'user'@'localhost' to database 'thedb' when using LOCK TABLES
  • MySQL How To Grant Access To ALL Databases For Export and Backup Purposes
  • mdadm how to stop or start a check
  • vzquota : (error) Quota on syscall for id 4532: No such file or directory vzquota on failed [3] OpenVZ Error and Solution
  • Apache htaccess Custom ErrorDocument not working properly for root home page 403 Error Issue and Solution
  • syslinux / pxelinux how to boot from local drive how to
  • samba how to listen on specific IP only
  • How To Install Windows Server 7 8 10 12 2008 2012 2014 2016 Servers Desktops using Linux tftp, dhcpd and samba
  • error: Could not locate RPC credentials. No authentication cookie could be found, and no rpcpassword is set in the configuration file Bitcoin Litecoin Error
  • OpenVZ Solutions vzquota : (error) Can't open quota file for id 123123, maybe you need to reinitialize quota: No such file or directory
  • curl: (35) Unknown SSL protocol error in connection Solution Centos
  • sudo: unable to resolve host
  • "Object of class WP_Term could not be converted to string"
  • Wordpress Instagram Post Modify Plugin To Add Tags
  • Linux input/output error invalid program cannot read data on some CD-Rs and DVD-Rs on ASUS BW-16D1HT
  • Installing SSL Certificate with Chain Intermediary CA File
  • PHP Warning: Cannot load module 'XCache' because conflicting module 'apc' is already loaded in Unknown on line 0
  • Unable to load dynamic library '/usr/lib64/php/modules/module.so' - /usr/lib64/php/modules/module.so: cannot open shared object file: No such file or directory in Unknown on line 0