Hi,
Support for decrementing a variable using the '-=' operator with
wsconsctl was added in r1.11 of wsconsctl.c. It never ended up being
documented. One might deduce that '-=' works since '+=' does.
However, I think adding documentation would be helpful.
Index: wsconsctl.8
===================================================================
RCS file: /cvs/src/sbin/wsconsctl/wsconsctl.8,v
retrieving revision 1.23
diff -u -p -r1.23 wsconsctl.8
--- wsconsctl.8 4 Aug 2008 07:32:51 -0000 1.23
+++ wsconsctl.8 3 Apr 2017 18:33:08 -0000
@@ -49,6 +49,10 @@
.Op Fl n
.Op Fl f Ar file
.Ar name Ns += Ns Ar value ...
+.Nm wsconsctl
+.Op Fl n
+.Op Fl f Ar file
+.Ar name Ns -= Ns Ar value ...
.Sh DESCRIPTION
The
.Nm
@@ -77,6 +81,8 @@ The value can be specified as either an
symbol,
or as a relative value, by using the
.Ql +=
+or
+.Ql -=
symbol.
See the
.Sx EXAMPLES
Index: wsconsctl.c
===================================================================
RCS file: /cvs/src/sbin/wsconsctl/wsconsctl.c,v
retrieving revision 1.29
diff -u -p -r1.29 wsconsctl.c
--- wsconsctl.c 8 May 2015 19:12:51 -0000 1.29
+++ wsconsctl.c 3 Apr 2017 18:33:08 -0000
@@ -72,8 +72,9 @@ usage(void)
"usage: %s [-an]\n"
" %s [-n] [-f file] name ...\n"
" %s [-n] [-f file] name=value ...\n"
- " %s [-n] [-f file] name+=value ...\n",
- __progname, __progname, __progname, __progname);
+ " %s [-n] [-f file] name+=value ...\n"
+ " %s [-n] [-f file] name-=value ...\n",
+ __progname, __progname, __progname, __progname, __progname);
exit(1);
}
