Use extended regular expressions when invoked as egrep (noted and initial

patch by Charles Steinkuehler).

findutils/config.in

@@ -8,6 +8,9 @@ comment 'Finding Utilities'
 
 bool 'find'	    CONFIG_FIND
 bool 'grep'	    CONFIG_GREP
+if [ "$CONFIG_GREP" = "y" ] ; then
+	bool ' egrep alias' CONFIG_FEATURE_GREP_EGREP_ALIAS
+fi
 bool 'which'	    CONFIG_WHICH
 bool 'xargs'	    CONFIG_XARGS
 endmenu

findutils/grep.c

@@ -243,6 +243,11 @@ extern int grep_main(int argc, char **argv)
 		perror_msg_and_die("atexit");
 #endif
 
+#ifdef CONFIG_FEATURE_GREP_EGREP_ALIAS
+	if (strcmp (basename (argv[0]), "egrep") == 0)
+		reflags |= REG_ICASE;
+#endif
+
 	/* do normal option parsing */
 	while ((opt = getopt(argc, argv, "iHhlnqvsce:f:"
 #ifdef CONFIG_FEATURE_GREP_CONTEXT

include/applets.h

@@ -149,7 +149,7 @@
 #ifdef CONFIG_ECHO
 	APPLET(echo, echo_main, _BB_DIR_BIN)
 #endif
-#if defined(CONFIG_FEATURE_GREP_EGREP_ALIAS) && defined(CONFIG_GREP)
+#if defined(CONFIG_FEATURE_GREP_EGREP_ALIAS)
 	APPLET_NOUSAGE("egrep", grep_main, _BB_DIR_BIN)
 #endif
 #ifdef CONFIG_ENV