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better parsing of sh commands (copied from jos sh)
cat: read from 1 if no args
sbrk system call, but untested
getpid system call
moved locks in keyboard intr, but why do we get intr w. null characters from keyboard?
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cd in shell
nits in mkdir, ls, etc.
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shell parses arguments (very simplistic)
readme version of README (sh doesn't deal with capital characters)
printf recognizes %c
nicer output format for ls
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mkdir
ls shows stat info for each dir entry
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stat
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primitive ls
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