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           source name
           source -h name
                   The shell reads commands from name.  source commands may be
                   nested; if they are nested too deeply the shell may run out
                   of file descriptors.  An error in a source at any level
                   terminates all nested source commands.  Normally input dur‐
                   ing source commands is not placed on the history list; the
                   -h option causes the commands to be placed on the history
                   list without being executed.