H

g/./m0

g//a\

hello world

# lines beginning with a `#' should be ignored

g/hello /# including in global commands \

s/lo/p!/\

a\

order\

.\

# and in the command list \

i\

caos\

.\

-1s/l/L

u

u

17,33g/[A-I]/-1d\

+1c\

hello world\

.\

47

;d

# don't change current address if no match

g/xxx/1d

;j

g/heLp! world//caos/d\

-;/order/;d

# to be undone

g/./s//x/g

u

w out.o