$ CMD>>>PS1='> '
> CMD>>>./sock_ut.py base &
[1] *
> CMD>>>./sock_ut.py srv upper &
[2] *
> srv upper start
CMD>>>./sock_ut.py srv eval &
[3] *
> srv eval start
CMD>>>./sock_ut.py cli upper foo bar hoge
foo --> FOO
bar --> BAR
hoge --> HOGE
> CMD>>>./sock_ut.py cli eval 1+1 2+3
1+1 --> 2
2+3 --> 5
> CMD>>>./sock_ut.py srv bc bc -l &
[4] *
> srv bc start
CMD>>>./sock_ut.py srvs
upper
eval
bc
> CMD>>>./sock_ut.py cli bc
CMD>>>1+1
2
CMD>>>10/3
3.33333333333333333333
CMD>>>^D> CMD>>>./sock_ut.py kill upper
srv upper quit
> CMD>>>
[2]   Done                    ./sock_ut.py srv upper
> CMD>>>./sock_ut.py kill_base
kill_base_srv
base_srv quit
> CMD>>>
[1]   Done                    ./sock_ut.py base
[3]-  Done                    ./sock_ut.py srv eval
[4]+  Done                    ./sock_ut.py srv bc bc -l
> CMD>>>exit
exit