1 files changed, 26 insertions, 4 deletions

diff --git a/include/usage.h b/include/usage.h
index 8b1a8d785..c4516e0eb 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -849,9 +849,21 @@
         "\t-I initstring\tSets the init string to send before anything else\n" \
         "\t-H login_host\tLog login_host into the utmp file as the hostname"
 
-
+#if ENABLE_FEATURE_GREP_EGREP_ALIAS
+#define USAGE_GREP_E(a) a
+#else
+#define USAGE_GREP_E(a)
+#endif
+#if ENABLE_FEATURE_GREP_CONTEXT
+#define USAGE_GREP_CTX(a) a
+#else
+#define USAGE_GREP_CTX(a)
+#endif
 #define grep_trivial_usage \
-        "[-ihHnqvs] PATTERN [FILEs...]"
+        "[-ihHnqvs" \
+        USAGE_GREP_E("E") \
+        USAGE_GREP_CTX("ABC") \
+        "] PATTERN [FILEs...]"
 #define grep_full_usage \
         "Search for PATTERN in each FILE or standard input.\n\n" \
         "Options:\n" \
@@ -859,10 +871,20 @@
         "\t-h\tsuppress the prefixing filename on output\n" \
         "\t-i\tignore case distinctions\n" \
         "\t-l\tlist names of files that match\n" \
+        "\t-L\tlist names of files that do not match\n" \
         "\t-n\tprint line number with output lines\n" \
-        "\t-q\tbe quiet. Returns 0 if result was found, 1 otherwise\n" \
+        "\t-q\tbe quiet. Returns 0 if PATTERN was found, 1 otherwise\n" \
         "\t-v\tselect non-matching lines\n" \
-        "\t-s\tsuppress file open/read error messages"
+        "\t-s\tsuppress file open/read error messages\n" \
+        "\t-c\tonly print count of matching lines\n" \
+        "\t-f\tread PATTERN from file\n" \
+        "\t-e\tPATTERN is a regular expression\n" \
+        "\t-F\tPATTERN is a set of newline-separated strings" \
+        USAGE_GREP_E("\n\t-E\tPATTERN is an extended regular expression") \
+        USAGE_GREP_CTX("\n\t-A\tprint NUM lines of trailing context") \
+        USAGE_GREP_CTX("\n\t-B\tprint NUM lines of leading context") \
+        USAGE_GREP_CTX("\n\t-C\tprint NUM lines of output context")
+
 #define grep_example_usage \
         "$ grep root /etc/passwd\n" \
         "root:x:0:0:root:/root:/bin/bash\n" \