You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

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There is a limit (MAXLINE - 2) on the number of characters
in a line. Se's MAXLINE is currently 512, so this isn't too much
of a problem.
If a filename is absent when invoked, all of the
options are not processed.
To go all the way back to the general help display, type "h".
To go back to the general help directory, type "hdir."