CosmOS
> load Edit.sbx
loaded, starting at 5000
> run poem.txt
poem.txt, new file
> a
: alpha
: beta
: gamma
: .
> i 2
: INSERTED
: .
> l
1: alpha
2: INSERTED
3: beta
4: gamma
> c 1
: CHANGED
> d 4
> l
1: CHANGED
2: INSERTED
3: beta
> w
written, 22 bytes
> q
> run poem.txt
poem.txt, 3 lines
> l
1: CHANGED
2: INSERTED
3: beta
> d 99
there is no such line
> q
> exit
halted
Execution halted.
[exit 0]