Table of Contents
tr - translate or delete characters
tr [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
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.
Report bugs to <bug-textutils@gnu.org>.
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 © 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