This is a nice way to improve efficiency of all shell scripts.
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Bash shell programmers can improve the efficiency of their scripts by using the shell’s dynamically loadable built-in commands. Chris F.A. Johnson shows us how to use them.
FTA “…If you use the shell for serious programming, as I do, speed of execution is a serious issue. A script should not appear sluggish; it should not be noticeably slower than a program written in Perl or Python  or even C. One of the major contributors to slowdown of scripts is starting a new process, whether it is an external command or command substitution. (All shells except Korn Shell 93 create a new process for command substitution.)…”
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| Category | List of Unix and Linux commands |
|---|---|
| File Management | cat |
| Firewall | CentOS 8 • OpenSUSE • RHEL 8 • Ubuntu 16.04 • Ubuntu 18.04 • Ubuntu 20.04 |
| Network Utilities | dig • host • ip • nmap |
| OpenVPN | CentOS 7 • CentOS 8 • Debian 10 • Debian 8/9 • Ubuntu 18.04 • Ubuntu 20.04 |
| Package Manager | apk • apt |
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| Searching | grep • whereis • which |
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| WireGuard VPN | CentOS 8 • Debian 10 • Firewall • Ubuntu 20.04 |