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> List and change kernel runtime variables.
Show all available variables and their values:
sysctl -a
Set a changeable kernel state variable:
sysctl -w {section.tunable}={value}
Get currently open file handlers:
sysctl fs.file-nr
Get limit for simultaneous open files:
sysctl fs.file-max
Apply changes from `/etc/sysctl.conf`:
sysctl -p
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