diff --git a/zshrc b/zshrc
index 6b50f24..170f11d 100644
--- a/zshrc
+++ b/zshrc
@@ -5,10 +5,10 @@ AUDIO_PLAYER_FORMATS=(aac flac it m4a mod mp3 mpc ogg sid spc wma wv xm)
 VIDEO_PLAYER_FORMATS=(avi divx flv mkv mov mpeg mp4 mpg ogm wmv)
 EDITOR="vim"
 PAGER="less"
-GREP="ggrep"
+GREP=""
 GREP_COLOUR="auto"
 FGREP=""
-LS="gls"
+LS=""
 LS_COLOUR="auto"
 LS_ON_CD="yes"
 LS_ON_INIT="no"
@@ -43,21 +43,39 @@ compinit -C
 zstyle ':completion:*' matcher-list 'm:{A-Z}={a-z} m:{a-z}={A-Z}'
 
 if [ "$GREP" -o "$GREP_COLOUR" ]; then
-	[ -z "$GREP" ] && GREP="grep"
+	if [ -z "$GREP" ]; then
+		if which ggrep &>/dev/null; then
+			GREP="ggrep"
+		else
+			GREP="grep"
+		fi
+	fi
 	[ ! -z "$GREP_COLOUR" -a "$GREP_COLOUR[1]" != "-" ] && \
 		GREP_COLOUR="--colour=$GREP_COLOUR"
 	alias grep="$GREP $GREP_COLOUR"
 fi
 
 if [ "$FGREP" -o "$GREP_COLOUR" ]; then
-	[ -z "$FGREP" ] && FGREP="fgrep"
+	if [ -z "$FGREP" ]; then
+		if which ggrep &>/dev/null; then
+			FGREP="ggrep -F"
+		else
+			FGREP="fgrep"
+		fi
+	fi
 	[ ! -z "$GREP_COLOUR" -a "$GREP_COLOUR[1]" != "-" ] && \
 		GREP_COLOUR="--colour=$GREP_COLOUR"
 	alias fgrep="$FGREP $GREP_COLOUR"
 fi
 
 if [ "$LS" -o "$LS_COLOUR" ]; then
-	[ -z "$LS" ] && LS="ls"
+	if [ -z "$LS" ]; then
+		if which gls &>/dev/null; then
+			LS="gls"
+		else
+			LS="ls"
+		fi
+	fi
 	[ ! -z "$LS_COLOUR" -a "$LS_COLOUR[1]" != "-" ] && \
 		LS_COLOUR="--color=$LS_COLOUR"
 	alias ls="$LS $LS_COLOUR"