TR("1") manual page

Table of Contents

## Name

tr - translate or delete characters

## Synopsis

tr [OPTION]... SET1 [SET2]

## Description

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 sequence of characters with one
-t, --truncate-set1
  first truncate SET1 to length of SET2
--help
  display this help and exit
--version
  output version information and exit

SETs are specified as strings of characters. Most represent themselves. Interpreted sequences are:

NNN
  character with octal value NNN (1 to 3 octal digits)
\
  backslash
a
  audible BEL
b
  backspace
form feed
  - new line
r
  return
t
  horizontal tab
vertical tab
CHAR1-CHAR2
  all characters from CHAR1 to CHAR2 in ascending order
[CHAR1-CHAR2]
  same as CHAR1-CHAR2, if both SET1 and SET2 use this
[CHAR*]
  in SET2, copies of CHAR until length of SET1
[CHAR*REPEAT]
  REPEAT copies of CHAR, REPEAT octal if starting with 0
[:alnum:]
  all letters and digits
[:alpha:]
  all letters
[:blank:]
  all horizontal whitespace
[:cntrl:]
  all control characters
[:digit:]
  all digits
[:graph:]
  all printable characters, not including space
[:lower:]
  all lower case letters
[:print:]
  all printable characters, including space
[:punct:]
  all punctuation characters
[:space:]
  all horizontal or vertical whitespace
[:upper:]
  all upper case letters
[:xdigit:]
  all hexadecimal digits
[=CHAR=]
  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.

## Reporting Bugs

Report bugs to <bug-textutils@gnu.org>.

## See Also

The full documentation for tr is maintained as a Texinfo manual. If the info and tr programs are properly installed at your site, the command

info tr

should give you access to the complete manual.

## Copyright

Copyright © 1999 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.

Table of Contents

- Name
- Synopsis
- Description
- Reporting Bugs
- See Also
- Copyright