Show memory slots (DIMM) linux
Physical DIMM slots: size, speed, type (requires root)
dmidecode -t memory | grep -E 'Size|Speed|Locator|Type:'
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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
ACL: grant user access
setfacl -m u:alice:rwx /srv/shared