Read file fileName and pass the contents to the Tcl interpreter as a script to evaluate in the normal fashion. The return value from source is the return value of the last command executed from the file. If an error occurs in evaluating the contents of the file then the source command will return that error. If a return command is invoked from within the file then the remainder of the file will be skipped and the source command will return normally with the result from the return command. If fileName starts with a tilde, then it is tilde-substituted as described in the Tcl_TildeSubst manual entry.
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