Applied patch from Christophe Boyanique to add an egrep alias for grep.

Config.h

@@ -329,6 +329,9 @@
 // Support for the -A -B and -C context flags in grep
 //#define BB_FEATURE_GREP_CONTEXT
 //
+// Support for the EGREP applet (alias to the grep applet)
+//#define BB_FEATURE_GREP_EGREP_ALIAS
+//
 // Tell tftp what commands that should be supported.
 #define BB_FEATURE_TFTP_PUT
 #define BB_FEATURE_TFTP_GET

applets.h

@@ -125,6 +125,9 @@
 #ifdef BB_ECHO
 	APPLET(echo, echo_main, _BB_DIR_BIN)
 #endif
+#if defined(BB_FEATURE_GREP_EGREP_ALIAS) && defined(BB_GREP)
+	APPLET(egrep, grep_main, _BB_DIR_BIN)
+#endif
 #ifdef BB_EXPR
 	APPLET(expr, expr_main, _BB_DIR_USR_BIN)
 #endif

applets/usage.h

@@ -344,6 +344,9 @@
 	"\t-v\tselect non-matching lines\n" \
 	"\t-s\tsuppress file open/read error messages"
 
+#define egrep_trivial_usage grep_trivial_usage
+#define egrep_full_usage grep_full_usage
+
 #define gunzip_trivial_usage \
 	"[OPTION]... FILE"
 #define gunzip_full_usage \

include/applets.h

@@ -125,6 +125,9 @@
 #ifdef BB_ECHO
 	APPLET(echo, echo_main, _BB_DIR_BIN)
 #endif
+#if defined(BB_FEATURE_GREP_EGREP_ALIAS) && defined(BB_GREP)
+	APPLET(egrep, grep_main, _BB_DIR_BIN)
+#endif
 #ifdef BB_EXPR
 	APPLET(expr, expr_main, _BB_DIR_USR_BIN)
 #endif

include/usage.h

@@ -344,6 +344,9 @@
 	"\t-v\tselect non-matching lines\n" \
 	"\t-s\tsuppress file open/read error messages"
 
+#define egrep_trivial_usage grep_trivial_usage
+#define egrep_full_usage grep_full_usage
+
 #define gunzip_trivial_usage \
 	"[OPTION]... FILE"
 #define gunzip_full_usage \

usage.h

@@ -344,6 +344,9 @@
 	"\t-v\tselect non-matching lines\n" \
 	"\t-s\tsuppress file open/read error messages"
 
+#define egrep_trivial_usage grep_trivial_usage
+#define egrep_full_usage grep_full_usage
+
 #define gunzip_trivial_usage \
 	"[OPTION]... FILE"
 #define gunzip_full_usage \