Tcl/Tk in a Nutshell

Name

exec

exec [options] arg [tag...]

Execute arguments as one or more shell commands. Return standard output from the last command in the pipeline.

Options

-keepnewline

Keep trailing newline at end of command pipeline’s output.

- -

Marks end of options (useful for commands that may start with a dash).

Command arguments can include these special symbols:

|	Separate commands in pipeline.
|&	Pipe standard out and standard error.
> filename	Use filename as standard input for command.
<@ fileId	Use fileId (from open command) as standard input.
<< value	Pass immediate value as standard input.
> filename	Redirect standard output to file.
2> filename	Redirect standard error to file.
>& filename	Redirect standard error and standard output to file.
>> filename	Append standard output to file.
2>> filename	Append standard error to file.
>>& filename	Append standard error and standard output to file.
>@ fileId	Redirect standard output to fileId.
2>@ fileId	Redirect standard error to fileId.
>&@ fileId	Redirect standard error and standard output to fileId.