How-To

A quick reference for backing up and restoring full ACL permissions across an entire directory tree using getfacl and setfacl.

A quick reference for understanding the key qualifiers that appear in RAID controller error codes, so you can pinpoint the exact failure condition instead of guessing from a generic error message.

A practical cheat sheet covering common regex patterns, Perl-compatible lookarounds, and character classes for everyday text processing in bash and grep.

A quick MySQL command to check the peak number of simultaneous connections your server has handled, useful for capacity planning and diagnosing connection bottlenecks.

A practical breakdown of how Linux file permissions work, including the symbolic and numeric chmod methods, special bits like setuid and sticky, and how permissions differ between files and directories.

A practical guide to resetting the krbtgt account password in Active Directory, including considerations for external trusts and the Microsoft-provided reset script.