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UNIX in a Nutshell: System V Edition

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The Awk Scripting Language
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Function that executes the specified command and returns its status. The status of the command that is executed typically indicates its success (1), completion (0) or unexpected error (-1). The output of the command is not available for processing within the awk script. Use " command | getline " to read the output of the command into the script. {N}

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