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tr - Unix, Linux Command


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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.

TagDescription
-c, -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
--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
\f form feed
\n new line
\r return
\t horizontal tab
\v vertical tab
CHAR1-CHAR2
  all characters from CHAR1 to CHAR2 in ascending order
[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.

AUTHOR

Written by Jim Meyering.

REPORTING BUGS

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

COPYRIGHT

Copyright © 2006 Free Software Foundation, Inc.
This is free software. You may redistribute copies of it under the terms of the GNU General Public License <http://www.gnu.org/licenses/gpl.html>. There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

tr is maintained as a Texinfo manual. If the info and tr programs are properly installed at your site, the command
TagDescription
info tr
should give you access to the complete manual.

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