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More linux commands

• Read/write kernel parameters
  sysctl -a | grep vm.swappinesscopy

  List all kernel parameters; filter by name

• Apply sysctl parameter
  sysctl -w net.ipv4.ip_forward=1copy

  Enable IP forwarding at runtime (also add to /etc/sysctl.d/)

• Show kernel boot parameters
  cat /proc/cmdlinecopy

  Parameters passed to the kernel at boot time

• Count open file descriptors system-wide
  cat /proc/sys/fs/file-nrcopy

  Allocated FDs, free FDs, and system-wide max (file-max)

• IO wait and throughput
  iostat -xz 2 5copy

  Extended disk IO stats every 2s, 5 iterations; look for %iowait, await

all 133 linux commands →