tr - translate or delete characters
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:
all letters and digits
all horizontal whitespace
all control characters
all printable characters, not including space
all lower case letters
all printable characters, including space
all punctuation characters
all horizontal or vertical whitespace
all upper case letters
all hexadecimal digits
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.
Written by Jim Meyering.
Report bugs to <firstname.lastname@example.org>.
Copyright (C) 2006 Free Software Foundation, Inc. This is free software. You may redistribute copies of it under the terms of the GNU General Public License <http://www.gnu.org/licenses/gpl.html>. There is NO WARRANTY, to the extent permitted by law.
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
should give you access to the complete manual.
Table of Contents