8.13.1 Template Objects
Template objects following methods:
- reset ()
Restore a pipeline template to its initial state.
- clone ()
Return a new, equivalent, pipeline template.
- debug (flag)
If flag is true, turn debugging on. Otherwise, turn debugging
off. When debugging is on, commands to be executed are printed, and
the shell is given
set -x command to be more verbose.
- append (cmd, kind)
Append a new action at the end. The cmd variable must be a valid
bourne shell command. The kind variable consists of two letters.
The first letter can be either of
'-' (which means the command
reads its standard input),
'f' (which means the commands reads
a given file on the command line) or
'.' (which means the commands
reads no input, and hence must be first.)
Similarily, the second letter can be either of
'-' (which means
the command writes to standard output),
'f' (which means the
command writes a file on the command line) or
'.' (which means
the command does not write anything, and hence must be last.)
- prepend (cmd, kind)
Add a new action at the beginning. See append() for explanations
of the arguments.
- open (file, mode)
Return a file-like object, open to file, but read from or
written to by the pipeline. Note that only one of
'w' may be given.
- copy (infile, outfile)
Copy infile to outfile through the pipe.
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