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