TLDR
Enter a command. For example: pbcopy, valet, nettop, security.

fsck

 
Check the integrity of a filesystem or repair it. The filesystem should be unmounted at the time the command is run. It is a wrapper that calls fsck_hfs, fsck_apfs, fsck_msdos, fsck_exfat, and fsck_udf as needed. More information: https://ss64.com/osx/fsck.html.
 
  • Check filesystem /dev/sdX, reporting any damaged blocks:
     
    fsck {{/dev/sdX}}
     
  • Check filesystem /dev/sdX only if it is clean, reporting any damaged blocks and interactively letting the user choose to repair each one:
     
    fsck -f {{/dev/sdX}}
     
  • Check filesystem /dev/sdX only if it is clean, reporting any damaged blocks and automatically repairing them:
     
    fsck -fy {{/dev/sdX}}
     
  • Check filesystem /dev/sdX, reporting whether it has been cleanly unmounted:
     
    fsck -q {{/dev/sdX}}

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