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'''cat /proc/meminfo''': Show Memory Information.
<pre>[root@localhost ~]# cat /proc/meminfo
MemTotal: 1012292 kB
MemFree: 95564 kB
DirectMap4k: 75648 kB
DirectMap2M: 972800 kB
</pre>'''cat /proc/swaps''': Show swap files.
'''cat /proc/net/dev''': Show Network adapters and statistics.
'''cat /proc/mounts''': Show mounted volumes in the system.
'''lspci -tv''': Show PCI devices.
'''lsusb -tv''': Show USB devices.
'''date''': Show the system date.
'''cal 2014''': Show calendar <cal + year>
'''cal 07 2014''': Show month.
'''date 041217002011.00''': set date (set, adjust) date y hour.