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-rw-r--r--gnu/usr.bin/diff/diff.15
1 files changed, 5 insertions, 0 deletions
diff --git a/gnu/usr.bin/diff/diff.1 b/gnu/usr.bin/diff/diff.1
index 0164f23..f04d90f 100644
--- a/gnu/usr.bin/diff/diff.1
+++ b/gnu/usr.bin/diff/diff.1
@@ -474,6 +474,11 @@ match any pattern contained in
.TP
.B \-y
Use the side by side output format.
+.SH RETURN VALUE
+.I diff
+returns 0 if the files are identical or 1 if the files differ.
+If one or both of the files cannot be opened,
+then the return value is set to 2.
.SH ENVIRONMENT
The environment variable
.B DIFF_OPTIONS
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