--- a/keychain.sh
+++ b/keychain.sh
@@ -14,7 +14,7 @@
 }
 
 version=##VERSION##
-PATH="${PATH}${PATH:+:}/usr/bin:/bin:/sbin:/usr/sbin:/usr/ucb"
+PATH=@TERMUX_PREFIX@/bin
 unset pidfile_out
 unset myaction
 havelock=false
@@ -158,16 +158,14 @@
 	tmpfile="$lockf.$$"
 
 	echo $$ >"$tmpfile" 2>/dev/null || exit
-	if ln "$tmpfile" "$lockf" 2>/dev/null; then
-		rm -f "$tmpfile"
+	if mv --update=none-fail "$tmpfile" "$lockf" 2>/dev/null; then
 		havelock=true && return 0
 	fi
 	if kill -0 "$(cat "$lockf" 2>/dev/null)" 2>/dev/null; then
 		rm -f "$tmpfile"
 		return 1
 	fi
-	if ln "$tmpfile" "$lockf" 2>/dev/null; then
-		rm -f "$tmpfile"
+	if mv --update=none-fail "$tmpfile" "$lockf" 2>/dev/null; then
 		havelock=true && return 0
 	fi
 	rm -f "$tmpfile" "$lockf" && return 1