Patch from Colin Watson (mangled slightly by Rob Landley):

This patch implements the 'T' command in sed. This is a GNU extension,
but one of the udev hotplug scripts uses it, so I need it in busybox
anyway.

Includes a test; 'svn add testsuite/sed/sed-branch-conditional-inverted'
after applying.

testsuite/sed/sed-branch-conditional-inverted

@@ -0,0 +1,14 @@
+busybox sed 's/a/1/;T notone;p;: notone;p'>output <<EOF
+a
+b
+c
+EOF
+cmp -s output - <<EOF
+1
+1
+1
+b
+b
+c
+c
+EOF