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Words can be no longer than 1024 characters.

The system limits argument lists to 10240 characters.

The number of arguments to a command which involves filename expansion is limited to 1/6th the number of characters allowed in an argument list.

Command substitutions may substitute no more characters than are allowed in an argument list.

To detect looping, the shell restricts the number of alias substitutions on a single line to 20.

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