BASIC-DOS

TR

TR [/C] [/D] [/S] set1 [set2]

A filter that copies input to output, replacing each character in set1 with the matching character in set2; if set2 is shorter, its last character repeats. TR doesn’t accept file names, so its input must come from a pipe or a redirected file (eg, TR a-z A-Z < NAMES.TXT).

• /C uses every character not in set1 (in ascending order)
• /D deletes the characters in set1, instead of replacing them
• /S squeezes each run of a character in the last set given into a single character

A set can contain ranges (eg, a-z) and these escapes:

• \t for TAB
• \n for LF
• \r for CR
• \ before any other character for that character (eg, \- or \\)

A set that contains spaces, or starts with the switch character and a letter, must be quoted.

DIR | TR a-z A-Z
TYPE README.TXT | TR /D \r
DIR | TR /S " "

ERRORLEVEL is set to 0, or 2 if a switch isn’t valid or a set is missing (or only set1 is given, without /D or /S), which TR reports (Syntax error).

Source: tr.asm

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