Print all input lines that are longer than 80 characters.
Remove trailing blanks and tabs from each line of input, and to delete entirely blank lines.
Reverse each line of input at a time.
Replace tabs in the input with the proper number of blanks to space to the next tab stop.
Rewrite the tabSize to make it useful indeed.
Replace strings of blanks by the minimum number of tabs and blanks to achieve the same spacing.
Fold long input lines into two or more shorter lines after the last non-blank character that occurs before the n-th column of input.
ignore tags file