CPU performance counters linux
Hardware CPU counters during a 5-second window
perf stat -e cycles,instructions,cache-misses -- sleep 5
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Show CPU info
lscpu | grep -E 'Model|Socket|Core|Thread|MHz'
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 '^\-\-\-\-'