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Next: 8.14 posixfile Up: 8.13 pipes Previous: 8.13 pipes

8.13.1 Template Objects

Template objects following methods:

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 'r', 'w' may be given.

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