Everything you need to level up your coding skills.
Regular expressions in shell tools explained: BRE, ERE and PCRE in grep, sed, awk and Bash, with real output, quoting rules, pitfalls and performance limits.
Test shell scripts with Bats and ShellCheck: write tests, mock commands, test functions, run in CI and containers, and catch quoting bugs before they ship.
Debug shell scripts from set -x and ShellCheck to traps, caller, PIPESTATUS and strace, with a real buggy script traced down to its root cause.
A practical shell script security guide: quoting, option injection, eval, temp files, PATH, secrets, sudo and least privilege, with attacks run and fixed.
An SSH guide from first login to a hardened, scripted setup: keys, config files, agents, tunnels, jump hosts, sshd hardening, automation and troubleshooting.
Automate tasks with cron and systemd timers: crontab syntax, timer units, locking, logging, missed runs, time zones and how to move from one to the other.
A grep sed awk guide with real, run examples: search, replace, extract and summarize text from logs, config files and CSV, and know which tool to pick.
A working Linux command line guide for developers: files, permissions, processes, text tools, find, archives, disks, networking and the habits that save time.
Write portable shell scripts that run on dash, BusyBox and Bash: what POSIX sh allows, which Bashisms to drop, and how to test on each shell.
A complete Bash scripting tutorial: variables, quoting, tests, loops, functions, arrays, exit codes, traps and a finished backup script you can trust.
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