![]() ![]() If ErrResult is not present, the error output from the child shell process goes to the standard error file. Each line of output becomes a single array element. ErrResultĪ named variable in which to place the error output (stderr) from the child process. Note: Result will be an empty string if the NOWAIT keyword is specified (Windows) or if Command ends in an ampersand ( &) (UNIX). If Result is not present, the output from the child shell process goes to the standard output (usually the terminal). The difference between these two is that $ can only be used interactively while SPAWN can be used interactively or in IDL programs ResultĪ named variable in which to place the output from the child process. Note: Using SPAWN in this manner is equivalent to using the IDL $ command. The SH keyword can be used to force use of the Bourne shell ( /bin/sh). UNIX spawn does not create a separate window, but runs on the user’s current tty, using the default shell (as specified by the SHELL environment variable). Under Windows, an interactive command shell window is created for this purpose. While you use the command interpreter process, IDL is suspended. If Command is not present, SPAWN starts an interactive command interpreter process, which you can use to enter one or more operating system commands. If it is a string array, SPAWN glues together each element of the string array, with each element separated by whitespace. On Windows, Command can be a scalar string or string array.On UNIX, Command is expected to be scalar unless used in conjunction with the NOSHELL keyword, in which case Command is expected to be a string array where each element is passed to the child process as a separate argument.If Command is present, it must be specified as follows: Windows-Only Keywords: ArgumentsĪ string containing the commands to be executed. To execute the UNIX ls command and store the result in the IDL string variable listing, enter: SPAWN, 'ls', listing Syntax To execute the UNIX ls command and return to the IDL prompt, enter: SPAWN, 'ls' To spawn a shell process from within IDL, enter the command: SPAWN See Additional Examples for more information on using SPAWN. If a command argument exceeds 8192 characters, the command is ignored. Note: For Windows-7, there is an OS limitation that results in the need to restrict the number of characters on the command argument to SPAWN. Under Windows, specify the NOWAIT keyword to SPAWN.Under UNIX, include an ampersand (&) at the end of your shell command.The syntax for this depends on the operating system on your system: It is possible to have IDL instead continue execution in parallel with the child process. If SPAWN is called without arguments, an interactive command interpreter process is started, in which you can enter one or more operating system commands.īy default, IDL waits for the child process started by SPAWN to finish before it continues. See Execution Directory under Microsoft Windows for a caution regarding Windows network paths. Note: See Using SPAWN Without a Shell Under UNIX for notes on executing commands without using a shell process under UNIX. The NOSHELL keyword can be used to execute the specified command directly without starting an intermediate command interpreter shell. Under Windows, a Command Shell is opened.The NOSHELL keyword can be used to execute a command directly as a child process without starting a shell process. ![]() Under UNIX, the shell used (if any) is obtained from the SHELL environment variable.The result of calling SPAWN depends on the platform on which it is being used: Standard electrical engineering quantities (maximum, minimum, fully-width-at-half-maximum, rise-time, more » mean, standard deviation) are calculated for each waveform and automatically displayed.The SPAWN procedure spawns a child process to execute a command or series of commands. When manipulating images, the spatial dimensions are maintained as important data. Typical operations are: time shifting, truncating before or after a specific time, adding, multiplying, integrating, and averaging. xdamp can manipulate waveforms both in time and in amplitude. A typical single data set from these applications will generate ~ 100 time-dependent waveforms and possibly a few images. time) and images (usually digitized radiographic film or digital camera outputs)that are typical of electrical engineering applications. Xdamp is a graphical user interface (GUI) designed to allow the user to manipulate two-dimensional waveforms (data vs. The original DAMP (DAta Manipulation Program) was written by Mark Hedemann of Sandia National Laboratories and used the CA-DISSPLA versions. ![]()
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