Bash - Using Sed to Replace

sed - stream editor

A stream editor is used to perform basic text transformations on an input stream (a file or input from a pipeline).

To replace text in a file:

sed 's/\t//g' 1.txt > 2.txt

Above is replacing every tab “\t” on the line because we use the “g” for global, with nothing so deleting the tabs in the file.

sed 's/\t/A/' 1.txt > 2.txt

Above replaces only the first tab on the line with a “A”.

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