/usr/src/xtables-addons-2.10/extensions/libxt_condition.man is in xtables-addons-dkms 2.10-1build1.
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This matches if a specific condition variable is (un)set.
.TP
[\fB!\fP] \fB\-\-condition\fP \fIname\fP
Match on boolean value stored in /proc/net/nf_condition/\fIname\fP.
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