I'm trying to insert a line after the last occurrence of a string in a file. Specifically, I want perl to:
  • find the last occurrence of 'echo' followed by anything, and ending in 'install_list',
  • insert another line of text right after it
    where example text to be parsed is as follows:

    echo ":os:5.7:" >> /mnt/install_list
[text removed here
....]
echo ":app:name-here:" >> /mnt/install_list

    [download]
    The line I want to insert is: 
    echo ":app:new-name-here:" >> /mnt/install_list

    [download]
    I tried the following command as a start: 
    perl -p -i.bak -e 's/echo*install_list(?!.*echo*install_list)/test/m' 
+test.cfg

    [download]
    I expected 'test' to be inserted in the test.cfg file, but it didn't work. Thoughts on getting this to work?

  • -- Burvil

    In reply to Look Ahead regexp to insert line? by bowei_99

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