- Replace all occurrences of a character in a file, and print the result:tr [find_characters] [replace_characters] < [filename]- Map each character of the first set to the corresponding character of the second set:tr 'abcd' 'jkmn' < [filename]- Delete all occurrences of the specified set of characters from the input:tr -d '[input_characters]'- Compress a series of identical characters to a single character:tr -s '[input_characters]'- Translate the contents of the file to upper-case and print result:tr "[:lower:]" "[:upper:]" < [filename]- Strip out non-printable characters from the file and print result:tr -cd "[:print:]" < [filename]
tr [,OPTION/]... ,SET1 /[,SET2/]
Translate, squeeze, and/or delete characters from standard input, writing to standard output.
SETs are specified as strings of characters. Most represent themselves. Interpreted sequences are:
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.
Written by Jim Meyering.
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report tr translation bugs to <http://translationproject.org/team/>
Copyright © 2016 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
Full documentation at: <http://www.gnu.org/software/coreutils/tr> or available locally via: info '(coreutils) tr invocation'