tr – translate characters
copies the standard input to the standard output with
substitution or deletion of selected characters (runes).
Input characters found in
are mapped into the corresponding characters of
is short it is padded to the length of
by duplicating its last character.
Any combination of the options
may be used:
replace it with a lexicographically ordered
list of all other characters.
Delete from input all characters in
Squeeze repeated output characters that occur in
to single characters.
In either string a noninitial sequence
is any character (possibly quoted), stands for
a range of characters:
a possibly empty sequence of codes running from
the successor of the previous code up through
the code for
followed by 1, 2 or 3 octal digits stands for the
value is given by those digits.
The character sequence
followed by 1, 2, 3, or 4 hexadecimal digits stands
for the character whose
16-bit value is given by those digits.
followed by any other character stands
for that character.
Replace all upper-case
letters by lower-case.
tr A-Z a-z <mixed >lower
Create a list of all
the words in
one per line in
where a word is taken to be a maximal string of alphabetics.
is given as a quoted newline.
tr -cs A-Za-z '
' <file1 >file2