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TR(1) User Commands TR(1)
NAME
tr - translate or delete characters
SYNOPSIS
tr [OPTION]... SET1 [SET2]
DESCRIPTION
Translate, squeeze, and/or delete characters from stan-
dard input, writing to standard output.
-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 charac-
ter that is listed in SET1 with a single occur-
rence 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 rep-
resent themselves. Interpreted sequences are:
\NNN character with octal value NNN (1 to 3 octal dig-
its)
\\ 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 translat-
ing, they may only be used in pairs to specify case con-
version. -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 (C) 2004 Free Software Foundation, Inc.
This is free software; see the source for copying condi-
tions. There is NO warranty; not even for MERCHANTABIL-
ITY or FITNESS FOR A PARTICULAR PURPOSE.
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.
tr 5.3.0 November 2004 TR(1)
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