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PROGRAM:

NAME


tr - translate characters

SYNOPSIS


tr [ -cds ] [ string1 [ string2 ] ]

DESCRIPTION


Tr copies the standard input to the standard output with substitution or deletion of
selected characters (runes). Input characters found in string1 are mapped into the
corresponding characters of string2. When string2 is short it is padded to the length of
string1 by duplicating its last character. Any combination of the options -cds may be
used:

-c Complement string1: replace it with a lexicographically ordered list of all other
characters.

-d Delete from input all characters in string1.

-s Squeeze repeated output characters that occur in string2 to single characters.

In either string a noninitial sequence -x, where x is any character (possibly quoted),
stands for a range of characters: a possibly empty sequence of codes running from the
successor of the previous code up through the code for x. The character followed by 1, 2
or 3 octal digits stands for the character whose 16-bit value is given by those digits.
The character sequence followed by 1, 2, 3, or 4 hexadecimal digits stands for the
character whose 16-bit value is given by those digits. A followed by any other character
stands for that character.

EXAMPLES


Replace all upper-case ASCII letters by lower-case.

tr A-Z a-z <mixed >lower

Create a list of all the words in one per line in where a word is taken to be a maximal
string of alphabetics. String2 is given as a quoted newline.

tr -cs A-Za-z '
' <file1 >file2

SOURCE


/src/cmd/tr.c

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