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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.

-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.


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