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5.7 Exclamation mark as not operator

The exclamation mark ‘!’ (aka “Bang!”) is a negation operator, just like the tilde ‘~’:

     octave:1> if ! strcmp (program_name, "octave"),
     >   "It's an error"
     > else
     >   "It works!"
     > end
     ans = It works!

Note however that Matlab uses the ‘!’ operator for shell escapes, for which Octave requires using the system command.