tr man page

tr — translate or delete characters

TL;DR

tr {{find_characters}} {{replace_characters}} < {{filename}}

tr 'abcd' 'jkmn' < {{filename}}

tr -d '{{input_characters}}'

tr -s '\n'

tr "[:lower:]" "[:upper:]" < {{filename}}

tr -cd "[:print:]" < {{filename}}

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
\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 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: <http://www.gnu.org/software/coreutils/>
Report tr translation bugs to <http://translationproject.org/team/>

See Also

Full documentation at: <http://www.gnu.org/software/coreutils/tr>
or available locally via: info '(coreutils) tr invocation'

Referenced By

perlop(1), petcat(1), proc(5), rumakeindex(1), sed(1), shtool-table(1).

November 2016 GNU coreutils 8.26 User Commands