Intel XENIX 286 Programmers Guide (86) - Tenox.tc

Programming Commands XENIX Programming
csh (continued)
Input/Output
The standard input and standard output of a command may be redirected with the
following syntax:
&name
>&!name
The file name is used as standard output. If the file does not exist, then it is
created; if the file exists, it is truncated, and its previous contents are lost.
>>name
>>&name
>>!name
>>&!name
B-42
If the variable noclobber is set, then the file must not already exist, or it must
be a character special file (for example, a terminal or /dev/null); otherwise, an
error results. This provision helps prevent accidental destruction of files. In
this case the ! forms can be used to suppress a check. The forms involving &
route the diagnostic output into the specified file as well as the standard output.
name is expanded in the same way as < input file names are.
Uses the file name as standard output like > but places output at the end of the
file. If the variable noclobber is set, then it is an error for the file not to exist
unless one of the ! forms is given. Otherwise similar to >.