Convert tabs in given files (or standard input, if the file is named -) to appropriate number of spaces; write results to standard output.
tabs is a comma-separated list of integers that specify the placement of tab stops. If exactly one integer is provided, the tab stops are set to every integer spaces. By default, tab stops are 8 spaces apart. With -t and --tabs, the list may be separated by whitespace instead of commas.
Convert tabs only at the beginning of lines.
Print help message and then exit.
Print version information and then exit.