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# DP: document deprecated syntax for arithmetic evaluation.
--- a/doc/bash.1
+++ b/doc/bash.1
@@ -3580,6 +3580,9 @@ and the substitution of the result. The
\fB$((\fP\fIexpression\fP\fB))\fP
.RE
.PP
+The old format \fB$[\fP\fIexpression\fP\fB]\fP is deprecated and will
+be removed in upcoming versions of bash.
+.PP
The
.I expression
undergoes the same expansions
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