commandlinefu.com is the place to record those command-line gems that you return to again and again.
Delete that bloated snippets file you've been using and share your personal repository with the world. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.
You can sign-in using OpenID credentials, or register a traditional username and password.
First-time OpenID users will be automatically assigned a username which can be changed after signing in.
Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):
Subscribe to the feed for:
Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:
Gives the DNS listed IP for the host you're on... or replace `hostname` with any other host
It's somewhat common ISPs to intercept DNS queries at port 53 and resolve them at their own.
To check if your ISP is intercepting your DNS queries just type this command in the terminal.
"#.abc" it's an OK answer.
But if you get something like "I am not an OpenDNS resolver.", yep, you are beign cheated by your ISP.
This removes the enclosing quotation marks ("), and sticthes the different packets together, e.g. '
Occasionally, to force zone updating, cache flush is necessary. This command is better than restart the mydns daemon.
Occasionally, to force zone updating, cache flush is necessary. Use this command is better than restart the Bind9 process.
Change the $domain variable to whichever domain you wish to query.
Works with the majority of whois info; for some that won't, you may have to compromise:
domain=google.com; for a in $(whois $domain | grep "Domain servers in listed order:" --after 3 | grep -v "Domain servers in listed order:"); do echo ">>> Nameservers for $domain from $a
Note that this doesn't work as well as the first one; if they have more than 3 nameservers, it won't hit them all.
As the summary states, this can be useful for making sure the whois nameservers for a domain match the nameserver records (NS records) from the nameservers themselves.
Simple command to trace a DNS query from the root all the way to the authoritative servers.
Instead of opening your browser, googling "whatismyip"...
Also useful for scripts.
dig can be found in the dnsutils package.
Shorter version, works with multiple words.
Will edit *.db files in the same directory with todays date. Useful for doing a mass update to domains on a nameserver, adding spf records, etc.
Looks for a string starting with 200 or 201 followed by 7 numbers, and replaces with todays date. This won't overwrite Ip's but i would still do some double checking after running this.
Make sure your server's date is correct, otherwise insert your own serial number.
should usually follow this command.
The +short option should make dig less chatty.