Show CPU info linux
CPU model, socket/core/thread topology, and clock speed
lscpu | grep -E 'Model|Socket|Core|Thread|MHz'
more linux
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Show memory slots (DIMM)
dmidecode -t memory | grep -E 'Size|Speed|Locator|Type:'
List PCI devices
lspci -v | grep -A5 'VGA\|Ethernet\|NVMe'
Set immutable file attribute
chattr +i /etc/resolv.conf && lsattr /etc/resolv.conf
Show extended file attributes
lsattr -R /etc/ 2>/dev/null | grep -v '^\-\-\-\-'
ACL: show permissions
getfacl /srv/shared