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.
If you have a new feature suggestion or find a bug, please get in touch via http://commandlinefu.uservoice.com/
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:
"That's it. Not much to see here. The first command writes any cache data that hasn't been written to the disk out to the disk. The second command tells the kernel to drop what's cached. Not much to it. This invalidates the write cache as well as the read cache, which is why we have the sync command first. Supposedly, it is possible to have some cached write data never make it to disk, so use it with caution, and NEVER do it on a production server. You could ... but why take the risk?
As long as you are running a post 2.6.16 kernel,..."
Mac install ssh-copy-id
From there on out, you would upload keys to a server like this:
(make sure to double quote the full path to your key)
ssh-copy-id -i "/PATH/TO/YOUR/PRIVATE/KEY" username@server
or, if your SSH server uses a different port (often, they will require that the port be '2222' or some other nonsense:
(note the double quotes on *both* the "/path/to/key" and "user@server -pXXXX"):
ssh-copy-id -i "/PATH/TO/YOUR/PRIVATE/KEY" "username@server -pXXXX"
...where XXXX is the ssh port on that server
similar to previous except this exports to a temporary file, opens that file with your default web browser, then deletes it.
first need to Edit the configuration file
and under the [tunnels] add this line
ciccio_diverso = /usr/bin/ssh -p 12345
Allows for manual set of the CPU's frequency. First look at "cpupower frequency-info" for all the available frequency steps your processor can be set at.
sudo cpupower frequency-set -f 1100MHz
Lets you change/set a governor to handle the frequency of your CPU.
Available governors are: "powersave", "conservative", "ondemand", "performance", and "userspace".
commandline for mac os x
echo '127.0.0.1 facebook.com' | sudo tee -a /etc/hosts
Do not execute this command if you don't know what you are doing.
This command will open tcp port 3000 in your machine
run `sudo update-rc.d gdm defaults` to get it back
Check to see if a port is open or closed on a given host.
Queries the specified ethernet device for associated driver information
i'm using gawk, you may get varying mileage with other varieties. You might want to change the / after du to say, /home/ or /var or something, otherwise this command might take quite some time to complete. Sorry it's so obsfucated, I had to turn a script into a one-liner under 255 characters for commandlinefu. Note: the bar ratio is relative, so the highest ratio of the total disk, "anchors" the rest of the graph. EDIT: the math was slightly wrong, fixed it. Also, made it compliant with older versions of df.
This will limit the average amount of CPU it consumes.
This script will run each time you boot up.The script must be in /etc/init.d directory.