Linux/Unix:Generic

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df -P
Report file-system information in parseble format.
df -h
Report file-system information in easy understandable precision (K, M or G when appropriate).
top
List process resource usage. By default having the most CPU-intensive process on top. Press 1 to have usage for each CPU apart.
lscpu
List CPU information
uname -a
Show kernel version
mountpoint -q <directory>
Check if <directory> is in use as mountpoint


RedHat (RHEL)

/etc/redhat-release
Redhat version installed