commandlinefu.com is the place to record those command-line gems that you return to again and again.
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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.
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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:
You'll need to install proctools. MacPorts and Fink have this if you're running Mac OS X, check your Linux distribution's repositories if it isn't installed by default.
This is to get the latest version of phpMyAdmin to support scripts to download the latest version of the software if they want to automatically update.
list what applications using what ports
Will print the host associated with the current stdin.
This is useful to set the DOIT_SERVER for the doit remote execution agent ( http://www.chiark.greenend.org.uk/~sgtatham/doit/ )
export DOIT_HOST=$(who -m | sed 's/.*(\(.*\)).*/\1/')
Note that SSH_CLIENT variable can be lost if you use su or sudo (if set to reset vars)
Telnet will make a tcp connection to a remote ip/port to test connectivity. If it times out, it's not reaching the host (maybe the firewall is blocking it). If connection is refused, it's reaching the host, but either the service is not listening on that port, or it's locked.
If you need to create a profile and are already running Firefox, you don't need to close it to do it. Also, if you don't know the exact name of the profile, this would allow you to pick from a list.
Use this command to see logs update in real time
I think this is the cleanest way of getting the current working directory of a script. It also works on osx, Linux, and probably bsd as well..
Probably posted previously, I use this all the time to find and kill a process for "APP". Simply replace "APP" with the name of the process you're looking to kill.
This is like `cd -` but doesn't echo the new directory name, which is preferable (to me) for an alias, e.g.
alias cdo="cd $OLDPWD"
Be careful when issuing this command, it may kill unwanted processes!
To only search on the process name don't use the argument -f, pkill foo
We normally get tasks in which one has to sort a data file according to some column. For a single file say foo, we would use
sort -k 3 foo >tmp && tmp foo
The for loop is useful when we have to do it on a number of files.
This command deletes all but the first occurrence of a duplicate file in one or more folders.
Consider this file :
I can use awk substring to laminate words :