Using tr and dos2unix


Article from Issue 53/2005

The tr tool is a real wizard. This simple command lets you replace strings in text files. Whether you are replacing letters or just removing whitespace, you will be amazed at tr‘s versatility.

The tr command replaces characters

in text files. The command

reads the standard input and

sends the results to standard output. But

of course, you can use the familiar operators

to redirect both streams. In fact, tr

really shines in combination with other

shell commands.

Simple Replacements

The tr command expects two strings as

arguments and replaces all the occurrences

of the first argument in a text

with the second argument. This may

sound complicated, but let’s look at a

simple example. The following command

replaces the “e“s in “Petronella”

with “a“s:

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