Unverified50% confidenceFactExact time
The POSIX standard allows exit codes in the range 0–255; grep uses exit code 1 to indicate no match found and 2 to indicate an error occurred, while diff uses 1 to indicate files differ and 2 to indicate an error.
1
Sources
50%
Confidence
Long-term
Relevance
8/5/2026
First Seen
Sources
训练检查器的第三种退出码：无法判断≠失败
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