How to do a DNS lookup from the command line
You push a DNS change, then sit there wondering if it actually took. Don't wonder, ask: nslookup example.com works on any OS, Windows included, and confirms a name resolves or ...
Tag: cli
How to show your IP address from the command line
Someone on the phone asks for your IP, and you blank on which command your OS wants. Windows takes ipconfig; Linux wants ip addr, or just ip a if you're ...
How to change file permissions with chmod
So the script won't run, or a web folder throws a 403 you can't explain. That's permissions, and the fix is usually chmod 644 for a plain file or chmod ...
How to find files with find on Linux
A disk fills up, or a config file vanishes, and suddenly we need one file out of fifty thousand. find is the tool for that, and its shape never changes: ...
How to search text in files with grep
Somewhere in this project sits the line that sets that value, and we have no idea which file. grep 'pattern' file searches one file, and grep -r 'pattern' . walks ...
How to download a file and test an API with curl
Some CDN link just handed you a 200-byte HTML file instead of the zip. We've been there, and the fix is one letter: curl -LO follows the redirect to the ...