-e '/^--- /d; /^+++ /d; /^@@ /d;' \
-e 's/^\(.[0-7][0-7][0-7][0-7][0-7][0-7]\) '"$_x40"' /\1 X /' "$1"
test_cmp expected current
-e '/^--- /d; /^+++ /d; /^@@ /d;' \
-e 's/^\(.[0-7][0-7][0-7][0-7][0-7][0-7]\) '"$_x40"' /\1 X /' "$1"
test_cmp expected current