added string search

en

@@ -22,11 +22,12 @@ then
 fi
 
 help="$(printf "Commands:\n\
+/ – display lines containing a string.\n\
+? – displays this help message.\n\
 a – appends a line to the current buffer.\n\
 c – clears the screen.\n\
 d – deletes a line.\n\
 e – evaluates a command in the shell environment.\n\
-? – displays this help message.\n\
 i – inserts a line into the buffer at position line.\n\
 p – prints the current buffer.\n\
 q – terminates editing.\n\
@@ -56,6 +57,13 @@ while test -n "$1"; do
 		read -r command args
 
 		case $command in
+			"/")
+				if test -z "$args"; then
+					printf "%s: %s: Missing argument.\n" "$argv0" "$args"
+				else
+					printf "%s" "$content" | nl | sed -n "/$args/p"
+				fi
+				;;
 			"?")
 				if test -z "$args"; then
 					printf "%s: %s\n" "$argv0" "$help"
@@ -79,8 +87,6 @@ while test -n "$1"; do
 					do
 						content="$(printf "%s\n" "$content" |\
 							awk -v l="$line" 'NR == l {next} {print}')"
-						#del="$(printf "%s\n" "$content" | head -n "$line" | tail -n 1)"
-						#content="$(printf "%s\n" "$content" | sed -n "/$del/!p")"
 					done
 				fi
 				;;
@@ -111,7 +117,7 @@ while test -n "$1"; do
 				fi
 				;;
 			"r")
-				content="$(printf "%s" "$content" | sed "$args")"
+				content="$(printf "%s" "$content" | sed -e "$args")"
 				;;
 			"w")
 				printf "%s\n" "$content" > "$1"