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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 . System V requires that string1 and string2 be enclosed in square brackets. BSD versions do not have this requirement.



Complement characters in string1 with characters in the current character set. The complement is the set of all characters not in string1 .


Delete characters in string1 from output.


Squeeze out repeated output characters in string2 .


Change uppercase to lowercase in a file:

tr '[A-Z]' '[a-z]' < file

Solaris allows the use of character classes:

tr '[:upper:]' '[:lower:]' < file

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):

tr -s "" "\012" < file > new.file

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

tr -d : < file > new.file

Make long search path more readable:

echo $PATH | tr ':' '\n'

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