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Does any one know how to find and replace text in a file. it can be implimented into a bash file. i would like to find the line and the output the text to it the file can only be opened with the root sudo account.

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  • this is not a duplicate i would like to have a answer that explains it in more detial and what i have to put were i.e. the location of the text file the text to find and the text to replace
    – Jhondoe
    Jan 28 '15 at 17:18
  • @Jhondoe That's what manuals are for: man sed.
    – nanny
    Jan 28 '15 at 17:33
  • i did not know what sed was untill the first answer
    – Jhondoe
    Jan 28 '15 at 17:34
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Basic example of sed usage using this as test.txt:

one two
three two four
two five

To replace two with foo in that file:

sed -i 's/foo/two/g' test.txt

What that means:

  • sed is the name of the command, you'll find lots of tutorials (e.g.) and other documentation online, in addition to man sed.
  • -i means edit a file in place.
  • 's/foo/two/g': the s indicates substitute first term for the second, the g (global) indicates for all instances in each line (not just the first). Always remember to 'enclose' this.

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