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  1. or download this
    devel# ./bar
    Can't exec "./foo": No such file or directory at ./bar line 3.
    ...
    BEGIN failed--compilation aborted at ./bar line 3.
    
    devel#
    
  2. or download this
    devel# ./bar
    I am ./foo ()
    
  3. or download this
    devel# ./bar 123
    I am ./foo (123)
    
    devel#