TR(1)TR(1)NAMEtr - translate character codes
SYNOPSIStr [-cds] [string1] [string2]
OPTIONS-c # Complement the set of characters in string1
-d # Delete all characters specified in string1
-s # Squeeze all runs of characters in string1 to one character
EXAMPLEStr ′A-Z′ ′a-z′ <x >y
# Convert upper case to lower case
tr-d ′0123456789′ <f1 >f2
# Delete all digits from f1
DESCRIPTION
Tr performs simple character translation. When no flag is specified,
each character in string1 is mapped onto the corresponding character in
string2 .
There are two types of tr out there, one that requires [ and ] for
character classes, and one that does not. Here is what the example
above would look like for a tr that needs the brackets:
tr ′[A-Z]′ ′[a-z]′ <x >y
Use [ and ] if you want to be portable, because a tr that doesn't need
them will still accept the syntax and mindlessly translate [ into [ and
] into ].
MINIX tr supports the following character classes: alnum, alpha, digit,
lower, upper and xdigit. If any of these keywords is encountered
between backets and colons, it is replaced by respectively alphanumeric
characters, alphabetic characters, decimal digits, lowercase letters,
uppercase letters and hexadecimal digits. The following are equivalent
with the given examples:
tr ′[:upper:]′ ′[:lower:]′ <x >y
# Convert upper case to lower case
tr-d ′[:digit:]′ <f1 >f2
# Delete all digits from f1
TR(1)
