TLDR
Enter a command. For example: paccache, xbacklight, fuser, whatis.

sysctl

 
List and change kernel runtime variables. More information: https://manned.org/sysctl.8.
 
  • 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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