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TIBCO GridServer® 7.1.0

# Command Execution

To execute a command on a local machine within a PDS script, you can use the `execute` statement. A subshell is spawned for the command, unless specified otherwise with the shell command. The subshell has the path available on the Engine or Driver. The execute statement also enables you to set the stdin, stdout, and stderr used by the command. For example, the following script is a simple PDS script that uses `execute`:

    job simplecommand
    task 1
        execute stdin="input.txt" stdout="output.txt"
        stderr="error.txt"
            "sort"
    end
    end job

This script creates one task, which takes the contents of `input.txt`, sends them to the `sort` command on an Engine, collects the results into the file `output.txt`, and collects any errors in `error.txt`. All three files are located on the Engine in the Engine’s installation directory.

You can also use the “backtick” syntax (such as `‘command‘`) to do the same thing as `execute`, but the input, output, error, and shell cannot be set.

The `shell` statement can be used to specify the shell to be used for commands run by the `execute` command. The default is `/bin/bash` for UNIX and `cmd.exe` for Windows. This can be set to `none`, whereupon no shell is spawned.

You can also change the behavior of a script based on the return code of a command run with the `execute` statement by using the `onerror` statement. For more information about the `onerror` statement, see the TIBCO GridServer® Developer's Guide.

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