source(1)                                                     source(1)

  source

  NAME

    source - executes commands in a file without adding them to history

  SYNOPSIS

    source [-h] name [arg ...]

  DESCRIPTION

    This command is a C-shell built-in command.

    The shell reads and executes commands from name. The commands are not
    placed on the history list. If arguments (arg) are given, they are placed
    in argv. You can nest source commands; if they are nested too deeply,
    however, the shell might run out of file descriptors. An error in a source
    at any level terminates all nested source commands. With -h, commands are
    placed on the history list instead of being executed, much like history -
    L.