Software & Apps Linux source - Linux / Unix Command Pass a file to the Tcl interpreter as a text script by Juergen Haas Writer Former Lifewire writer Juergen Haas is a software developer, data scientist, and a fan of the Linux operating system. our editorial process Juergen Haas Updated on November 11, 2019 die-phalanx / Getty Images Linux Switching from Windows Tweet Share Email The source command takes the contents of the specified file or resource and passes it to the Tcl interpreter as a text script. The return value from source is the return value of the last command executed in the script. If an error occurs in evaluating the contents of the script, then the source command will return that error. If a return command is invoked from within the script, then the remainder of the file will be skipped and the source command will return normally with the result from the return command. Synopsis The command takes one of the three following forms: source fileNamesource -rsrc resourceName ?fileName?source -rsrcid resourceId ?fileName? The '-rsrc' Option is for Mac The -rsrc and -rsrcid forms of this command are only available on Mac computers. These versions of the command allow you to source a script from a text resource. You may specify what text resource to source by either name or id. By default, Tcl searches all open resource files, which include the current application and any loaded C extensions. Alternatively, you may specify the fileName where the text resource can be found. Use the man command (% man) to see how a command is used on your particular computer.