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Forgetting Linux commands is common, but Linux has built-in tools like `apropos` and `man -k` to help you find the right command quickly. These tools search the manual page descriptions for keywords, making them invaluable for sysadmins, developers, and cybersecurity professionals.
You Should Know:
1. Using `apropos` to Find Commands
The `apropos` command searches manual pages for a given keyword. For example:
apropos "search keyword"
Example:
apropos "network"
This lists all commands related to “network,” such as ifconfig, netstat, and ip.
2. Using `man -k` (Equivalent to `apropos`)
`man -k` does the same thing as `apropos`:
man -k "keyword"
Example:
man -k "process"
Output may include `ps`, `top`, and `kill`.
3. Updating the Manual Database
If a command isn’t found, update the manual database with:
sudo mandb
4. Combining with `grep` for Filtered Results
Narrow down results using `grep`:
apropos "file" | grep "copy"
5. Viewing Full Manual Pages
Once you find a command, read its full manual:
man <command>
Example:
man grep
6. Practical Cybersecurity & IT Use Cases
- Finding Password-Related Commands:
apropos "password"
- Locating Encryption Tools:
apropos "encrypt"
- Network Troubleshooting:
apropos "network scan"
7. Windows Equivalent (for Reference)
Windows users can use `Find-Command` in PowerShell:
Find-Command -Name "network"
What Undercode Say:
Forgetting commands is normal, but Linux provides powerful tools like `apropos` and `man -k` to rediscover them efficiently. These commands are especially useful in penetration testing, system administration, and debugging.
Expected Output:
$ apropos "archive" tar (1) - an archiving utility gzip (1) - compress or expand files
Keep exploring, and automate your workflow with these essential Linux tools!
References:
Reported By: Chuckkeith Cant – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
