Solutions to HW 1
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1. touch ./-u

2. There are many solutions, e.g.,
    a) ls [GPR]* [MJC]*[nc]* 
    b) ls [GPR]*
    c) ls [MJC]*[nc]*
    d) ls *.*

3. who | cut -d" " -f1

4. Do a 'man cal' to get the story!

5. du -h --max-depth=1 ( du -sh gives you just the summary, not the whole list
)