I/O redirection

### command 1 ###
# put the command here

### command 2 ###
# put the command here

### command 3 ###
# put the command here

### command 4 ###
sort x 2> memyselfandi

### command 5 ###
sort < x 2> memyselfandi

### command 6 ###
<x 2> memyselfandi sort

### command 7 ###
# put the command here

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