NAME

expand, unexpand − expand tabs to spaces, and vice versa

SYNTAX

expand [−tabstop] [−tabn...] [file...]
unexpand [−a] [file...]

DESCRIPTION

The expand command processes the named files or the standard input writing the standard output with tabs changed into blanks. Backspace characters are preserved into the output and decrement the column count for tab calculations. The expand command is useful for pre-processing character files (before sorting, looking at specific columns, and so forth) that contain tabs.

If a single tabstop argument is given then tabs are set tabstop spaces apart instead of the default 8.  If multiple tabstops are given then the tabs are set at those specific columns. 

The unexpand command puts tabs back into the data from the standard input or the named files and writes the result on the standard output. By default only leading blanks and tabs are reconverted to maximal strings of tabs.  If the −a option is given, then tabs are inserted whenever they would compress the resultant file by replacing two or more characters. 

OPTIONS

−#Sets tabstops the specified number of spaces (#) apart. 

−aWhen used with unexpand, compresses file by inserting tabs for two or more spaces. 

Commands