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Sh exercise
I/O redirection
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### command 1 ###
# put the command here
### command 2 ###
# put the command here
### command 3 ###
# put the command here
### command 4 ###
# put the command here
### command 5 ###
sort xxx 2> userinfo
### command 6 ###
sort < xxx 2> userinfo
### command 7 ###
< xxx 2> userinfo sort