Fsck
<operating system> file system check.
The
Unix program that checks a
file system for internal consistency and bad blocks etc. and can repair some faults.
fsck is often used after a
crash when the file system has been left in an inconsistent state, e.g. due to incomplete flushing of buffers.
Used on
Usenet newsgroup alt.sysadmin.recovery as substitute for "fuck" and became more main-stream after the
Communications Decency Act.