• VMware

    Learn about VMware virtualization for its products like vsphere ESX and ESXi, vCenter Server, VMware View, VMware P2V and many more

  • Linux

    Step by step configuration tutorials for many of the Linux services like DNS, DHCP, FTP, Samba4 etc including many tips and tricks in Red Hat Linux.

  • Database

    Learn installation and configuration of databases like Oracle, My SQL, Postgresql, etc including many other related tutorials in Linux.

  • Did you find what you needed?
    Show your support and gratitude by making a contribution!!
    Life always offers you a second chance ... Its called tomorrow !!!

    Sunday, June 25, 2017

    sed :Replace whole line when match found

    Here our requirement is to replace a line with our content when a match is found with in the file



    Our sample file /tmp/file
    This is line one
    This is line two
    This is line three
    This is line four

    Here we will search for line having the string "two" and replace the complete line with "your text"
    # sed '/two/c\your text' /tmp/file

    This is line one
    your text
    This is line three
    This is line four

    To do in place replacement in the same file
    # sed -i '/two/c\your text' /tmp/file
    Similarly if you want to match the line having the string "three" and replace the line with "your text"
    # sed '/three/c\your text' /tmp/file
    This is line one
    This is line two
    your text
    This is line four

    To do in place replacement in the same file
    # sed -i '/three/c\your text' /tmp/file
    IMPORTANT NOTE :  Do not use this unless you are very sure the command will not impact anything else, it is always recommended to take a backup of such file where you plan to do in place replacement

    Follow the below links for more tutorials

    How to find the path of any command in Linux
    How to configure a Clustered Samba share using ctdb in Red Hat Cluster
    How to delete an iscsi-target from openfiler and Linux
    How to perform a local ssh port forwarding in Linux
    How to use yum locally without internet connection using cache?
    What is umask and how to change the default value permanently?
    Understanding Partition Scheme MBR vs GPT
    How does a successful or failed login process works in Linux
    How to find all the process accessing a file in Linux
    How to exclude multiple directories from du command in Linux
    How to configure autofs in Linux and what are its advantages?
    How to resize software raid partition in Linux
    How to configure Software RAID 1 mirroring in Linux
    How to prevent a command from getting stored in history in Linux

    0 comments:

    Post a Comment