tr - translate or delete characters
[OPTION]... SET1 [SET2]
Translate, squeeze, and/or delete characters from standard input,
writing to standard output.
- -c, --complement
- first complement SET1
- -d, --delete
- delete characters in SET1, do not translate
- -s, --squeeze-repeats
- replace each input sequence of a repeated character
that is listed in SET1 with a single occurrence
of that character
- -t, --truncate-set1
- first truncate SET1 to length of SET2
- display this help and exit
- output version information and exit
SETs are specified as strings of characters. Most represent themselves.
Interpreted sequences are:
- character with octal value NNN (1 to 3 octal digits)
- audible BEL
- form feed
- new line
- horizontal tab
- vertical tab
- all characters from CHAR1 to CHAR2 in ascending order
- in SET2, copies of CHAR until length of SET1
- REPEAT copies of CHAR, REPEAT octal if starting with 0
- all letters and digits
- all letters
- all horizontal whitespace
- all control characters
- all digits
- all printable characters, not including space
- all lower case letters
- all printable characters, including space
- all punctuation characters
- all horizontal or vertical whitespace
- all upper case letters
- all hexadecimal digits
- all characters which are equivalent to CHAR
Translation occurs if -d is not given and both SET1 and SET2 appear.
-t may be used only when translating. SET2 is extended to length of
SET1 by repeating its last character as necessary. Excess characters
of SET2 are ignored. Only [:lower:] and [:upper:] are guaranteed to
expand in ascending order; used in SET2 while translating, they may
only be used in pairs to specify case conversion. -s uses SET1 if not
translating nor deleting; else squeezing uses SET2 and occurs after
translation or deletion.
Report bugs to <firstname.lastname@example.org>.
Copyright © 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.