GNU Info

(grep.info)Diagnostics

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Enter node , (file) or (file)node

Diagnostics
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   Normally, exit status is 0 if matches were found, and 1 if no matches
were found.
If a single empty file is used as the input, exit status of 1 is returned.
Exit status is >1 if there were syntax errors in the pattern,
inaccessible input files, or other system errors.