Index of /links/

Commands

• awk(1) cheatsheet by Ypnose
• GNU BRE and ERE cheatsheet
• nftables quick reference
• SQL commands cheatsheet by Ypnose

Linux

• Linux Kernel Explorer

POSIX

• sh(1)
• Utilities

Shell

• Bash FAQ
• Learning the Korn Shell (1rst edition)
• Learning the Korn Shell (2nd edition)
• Pure bash bible
• Pure sh bible

systemd

• systemd.exec(5)
• systemd.service(5)
• systemd.timer(5)
• systemd.unit(5)