Linux man pages

Section (1) tr

Linux manual pages	Section 1

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, −C, −−complement: use the complement of SET1
−d, −−delete: delete characters in SET1, do not translate
−s, −−squeeze−repeats: replace each sequence of a repeated character that is listed in the last specified SET, 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
: backspace
f: form feed
: new line
: return
: 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 the last specified SET, and occurs after translation or deletion.

AUTHOR

Written by Jim Meyering.

REPORTING BUGS

GNU coreutils online help: <https://www.gnu.org/software/coreutils/>

Report any translation bugs to <https://translationproject.org/team/>