sysctl: add -e: supress warnings about invalid key (Jeremy Kerr <jk@ozlabs.org>)

code shrink:

   text    data     bss     dec     hex filename
 775565     929    9100  785594   bfcba busybox_old
 775296     929    9100  785325   bfbad busybox_unstripped

1 files changed, 6 insertions, 5 deletions

diff --git a/include/usage.h b/include/usage.h
index d910e2bf6..0ae819a1a 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -3505,16 +3505,17 @@ USE_FEATURE_RUN_PARTS_FANCY("\n	-l	Prints names of all matching files even when
        "Configure kernel parameters at runtime" \
        "\n\nOptions:\n" \
        "        -n      Disable printing of key names\n" \
+       "        -e      Don't warn about unknown keys\n" \
        "        -w      Change sysctl setting\n" \
        "        -p FILE Load sysctl settings from FILE (default /etc/sysctl.conf)\n" \
        "        -a      Display all values\n" \
        "        -A      Display all values in table form"
 #define sysctl_example_usage \
-       "sysctl [-n] variable...\n" \
-       "sysctl [-n] -w variable=value...\n" \
-       "sysctl [-n] -a\n" \
-       "sysctl [-n] -p file     (default /etc/sysctl.conf)\n" \
-       "sysctl [-n] -A\n"
+       "sysctl [-n] [-e] variable...\n" \
+       "sysctl [-n] [-e] -w variable=value...\n" \
+       "sysctl [-n] [-e] -a\n" \
+       "sysctl [-n] [-e] -p file        (default /etc/sysctl.conf)\n" \
+       "sysctl [-n] [-e] -A\n"
 
 #define syslogd_trivial_usage \
        "[OPTION]..."