- pidof(8): make -s optional and optional -o; closes #168

  first cut.

1 files changed, 24 insertions, 3 deletions

diff --git a/include/usage.h b/include/usage.h
index fad50efdc..bef6a4dd2 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -2160,16 +2160,37 @@
         "$ patch -p1 <example.diff\n" \
         "$ patch -p0 -i example.diff"
 
+#if ENABLE_FEATURE_PIDOF_SINGLE
+#define USAGE_FEATURE_PIDOF_SINGLE(a) a
+#else
+#define USAGE_FEATURE_PIDOF_SINGLE(a)
+#endif
+#if ENABLE_FEATURE_PIDOF_OMIT
+#define USAGE_FEATURE_PIDOF_OMIT(a) a
+#else
+#define USAGE_FEATURE_PIDOF_OMIT(a)
+#endif
+#if (ENABLE_FEATURE_PIDOF_SINGLE || ENABLE_FEATURE_PIDOF_OMIT)
+#define USAGE_PIDOF "Options:"
+#else
+#define USAGE_PIDOF "\n\tThis version of pidof accepts no options."
+#endif
+
 #define pidof_trivial_usage \
         "process-name [OPTION] [process-name ...]"
+
 #define pidof_full_usage \
         "Lists the PIDs of all processes with names that match the\n" \
         "names on the command line.\n" \
-        "Options:\n" \
-        "\t-s\t\tdisplay only a single PID"
+        USAGE_PIDOF \
+        USAGE_FEATURE_PIDOF_SINGLE("\n\t-s\t\tdisplay only a single PID") \
+        USAGE_FEATURE_PIDOF_OMIT("\n\t-o\t\tomit given pid.") \
+        USAGE_FEATURE_PIDOF_OMIT("\n\t\t\tUse %PPID to omit the parent pid of pidof itself")
 #define pidof_example_usage \
         "$ pidof init\n" \
-        "1\n"
+        "1\n" \
+        USAGE_FEATURE_PIDOF_OMIT("$ pidof /bin/sh\n20351 5973 5950\n") \
+        USAGE_FEATURE_PIDOF_OMIT("$ pidof /bin/sh -o %PPID\n20351 5950")
 
 #ifndef CONFIG_FEATURE_FANCY_PING
 #define ping_trivial_usage "host"