UNIX in a Nutshell: System V Edition

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UNIX Commands
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tr [options] [string1 [string2]]

Copy standard input to standard output, performing substitution of characters from string1 to string2 or deletion of characters in string1.



Complement characters in string1 with ASCII 001-377.


Delete characters in string1 from output.


Squeeze out repeated output characters in string2.


Change uppercase to lowercase in a file:

cat file | tr `[A-Z]` `[a-z]`

Turn spaces into newlines (ASCII code 012):

tr ' ' '\012' <file

Strip blank lines from file and save in new.file (or use \011 to change successive tabs into one tab):

cat file | tr -s "" "/012" > new.file

Delete colons from file; save result in new.file:

tr -d : <file > new.file

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