cat >editor <<\EOF
#!/bin/sh
-sed -e "s/a file/an amend commit/g" < $1 > $1-
-mv $1- $1
+sed -e "s/a file/an amend commit/g" < "$1" > "$1-"
+mv "$1-" "$1"
EOF
chmod 755 editor
cat >editor <<\EOF
#!/bin/sh
-sed -e "s/amend/older/g" < $1 > $1-
-mv $1- $1
+sed -e "s/amend/older/g" < "$1" > "$1-"
+mv "$1-" "$1"
EOF
chmod 755 editor