tr1
Translate or delete characters
Usage
tr [OPTION] ...
STRING1
[STRING2]
Overview
Translate, squeeze, and/or delete characters from standard input, writing to standard output. STRING1 and STRING2 specify arrays of characters ARRAY1 and ARRAY2 that control the action.
-
-c, -C, --complement -
use the complement of ARRAY1
-
-d, --delete -
delete characters in ARRAY1, do not translate
-
-s, --squeeze-repeats -
replace each sequence of a repeated character that is listed in the last specified ARRAY, with a single occurrence of that character
-
-t, --truncate-set1 -
first truncate ARRAY1 to length of ARRAY2
-
--help -
display this help and exit
-
--version -
output version information and exit
ARRAYs 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 ARRAY2, copies of CHAR until length of ARRAY1 |
[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 STRING1 and STRING2 appear. -t is only significant when translating. ARRAY2 is extended to length of ARRAY1 by repeating its last character as necessary. Excess characters of ARRAY2 are ignored. Character classes expand in unspecified order; while translating, '[:lower:]' and '[:upper:]' may be used in pairs to specify case conversion. Squeezing occurs after translation or deletion. Arguments like '[...]' should be quoted, to avoid potential shell globbing.
Releases
19 releases since Debian 1.1 (Buzz); the text changed 15 times.
--complement since Debian 2.2 (Potato);
--delete since Debian 2.2 (Potato);
--squeeze-repeats since Debian 2.2 (Potato);
--truncate-set1 since Debian 2.2 (Potato);
-C since Debian 4.0 (Etch);
-c since Debian 2.2 (Potato);
-d since Debian 2.2 (Potato);
-s since Debian 2.2 (Potato);
-t since Debian 2.2 (Potato).