sed

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sed is a command line tool to transform text.

Starting with sed

The official documentation for GNU sed is not very beginner friendly.

Yet, it is very easy to get started with sed. The command:

$ sed 's/apple/banana/' file.txt

will change the first occurrence on each line of 'apple' to 'banana'.

Adding the operator 'g' (for 'global') will change all occurrences:

$ sed 's/apple/banana/g' file.txt

With the option --in-place, the file itself will be changed, instead of the result being simply output to the console:

$ sed --in-place 's/apple/banana/g' file.txt

See sub-wiki page below.

You might want to use grc instead:

* app-misc/grc
Homepage: http://kassiopeia.juls.savba.sk/~garabik/software/grc.html
Description: Generic Colouriser beautifies your logfiles or output of commands

Official resources:

Wikipédia:

Other:

Project	Summary	Status	Priority	Category	Last updated	Assigned to
Programming	Regex: what does {N;d} mean?	active	normal	support request	8 years 45 weeks