# Command: sysexec

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Name:

    sysexec - Transfer control to a UNIX-command

Synopsis:

    CommandArray  sysexec ->	-
      CommandString sysexec ->	-

Examples:

    These two calls are equivalent:
      1. [ (ls) (-l) (/home/kupper) ] sysexec
      2. (ls -l /home/kupper) sysexec

      This call is NOT equivalent to the above (see remarks below):
      3. [ (ls) (-l /home/kupper) ] sysexec

      4. {(ls -l /home/kupper) sysexec} spoon

      Look at the program environment of the new command:
      5. {(printenv) sysexec} spoon
      It was inherited from the SLI process.

Description:

    Transfer control to a UNIX-Command. The command may be
      executed in a specified program environment. The command
      may be given either as a string containing the command
      name and all options, or as an array of strings,
      specifying the command name and every single option.

      Alternatives: Functions sysexec_a for arrays, sysexec_s
      for strings (both undocumented) -> behaviour and synopsis
      are the same.

Parameters:

    In : CommandArray
      (array of strings): An array containing the command to execute.
      The first element is interpreted as the
      command, the remaining elements as it's
      parameters.
      CommandString
      (string)	 : A standard UNIX command string, containing
      the command name and it's parameters to
      execute.

      Out: -whatever will be will be-

Bugs:

    Will break down if given an array containing non-strings.

      This call is NOT quivalent to example 3, as one should expect:
      (ls "-l /home/kupper") sysexec.
      The reason is the breakup-command not recognizing ".

Remarks:

    A call to sysexec WILL NOT RETURN, as control is literally transfered to
      the UNIX command.

      Given an array of strings, each element is treated as -one- parameter.
      That's why example 3. is equivalent to the UNIX-call
      ls "-l /home/kupper".

Author:

    R Kupper

FirstVersion:

    Mar 18 1999

SeeAlso:

- spoon
- breakup
- environment

Source:

    /opt/conda/conda-bld/nest_1512421404550/work/nest-2.12.0/lib/sli/processes.sli

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