Open System Services Shell and Utilities Reference Manual (G06.27+, H06.04+)

User Commands (d - f) diff(1)
Block, character, or FIFO special files cannot be used with the diff command because they cause
the command to exit.
Because /G and /E both appear in your local root directory, you should be very careful when
using OSS shell commands on or from the root directory. OSS shell commands that perform
recursive actions make no destinction between Guardian and OSS files or between local and
remote files.
EXIT VALUES
An exit value of 0 (zero) indicates no differences; a value of 1 indicates differences were found,
and value greater than 1 indicates an error.
RELATED INFORMATION
Commands: comm(1), ed(1), pr(1).
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