Unix/Linux Commands System Info

Date : Shows the current date and Time.
Cal : Shows this month's calendar.
uptime : Show current Uptime.
W : Displays who is online.
whoami : Displays user's information.
uname -a : Show Kernal information.
cat /proc/cpuinfo : Cpu information.
cat /proc/meminfo : Menory information.
df : Show disk usage.
du : Show directory space usage.
free : Show memory and Swap usage 
whereis app : Show possible locatins of app
which app : show which app will be run by default

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