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Writing Deskshell commands

Redirections

A redirection causes a UNIX file descriptor to be redirected to a different file. The following options are available:


< filename
the file is opened on descriptor 0, standard input, for reading only; it must already exist

> filename
the file is opened on descriptor 1, standard output, for writing, and is truncated; it is created if necessary

>> filename
the file is opened on descriptor 1, standard output, for append only; it is created if necessary
The following variants are available for each redirection. In each case ``<'' can be replaced by ``>'' or ``>>''.

< filename
read from filename

<[number] filename
read from filename on descriptor number

<[new=number]
make new a duplicate of number

<[number=]
close descriptor number

For example:
   for_info < $static_arg
displays the text from file $static_arg in a dialog box, and:
   gti 'Enter name:' > name
saves the user's name in a file name.

See also:


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