Any of three characters can be placed in front of a command to modify how the command is run:

• dash)
  Turns off error checking for the command
  @ (at sign)
  Suppresses display of the command
  ! (exclamation point)
  Executes the command for each dependent file

  Note:

  Spaces can separate the modifying character from the command. Any command on a separate line - whether modified or not - must be indented by one or more spaces or tabs.

  You can use more than one character to modify a single command.

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