netstat -tupl :List internet services on a system
netstat -tup :List active connections to/from system
# lsof -p $$ :List paths that process id has open
# lsof ~ :List processes that have specified path open
# last reboot :Show system reboot history.
# ls -lSr :Show files, biggest last
# du -s * | sort -k1,1rn | head :Show top disk users in current dir. See also dutop
# cat /proc/partitions :Show all partitions registered on the system
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