find the files locked by rcs utility Show Sample Output
-T = traceroute -V = verbose --tr-stop = exit when target is reached -n = don't do reverse lookups (faster) -2 = udp -p 53 = destination port 53 (dns), change to your needs Useful when trying to debug a network with complex routing rules and/or multiple gateways.
Requires 'reflector' package from official repository. '5' in the example is the number of mirrors you want in the mirrorlist, could be other numbers of course.
Clears the package cache of all uninstalled packages. Does not remove package configuration files in user's home directory.
Clears the package cache of all packages, installed and uninstalled packages. Do NOT USE if you might want to downgrade a package later.
Removes the package, 'packagename' in the example ,from your system. '-R' is the actual removal option, 'n' is for removing backup configuration files saved by pacman, and 's' is for removing the dependencies of the given package which are not required by other packages. pacman does not remove configuration files, etc. created by the package.
Extracting .gz files and placing the output in another directory in one command line is convenient thing. I just followed some how-to to install Nagios on Ubuntu Lucid Lynx but they give the method to install from archives. I wished to install from the repository. If you do so some files are missing. I've not tested yet but this is an example command line I did to extract sudo sh -c 'gunzip -c /usr/share/doc/nagios3-common/examples/template-object/templates.cfg.gz > /etc/nagios3/objects/templates.cfg' We need privilege to write the destination file. Show Sample Output
Usage: VBoxBlockBoot [Virtual_Machine] [Block_device]
Eg: VBoxBlockBoot WinXP /dev/sdc
In another words
vm=usb; usb=sdc;sudo umount /dev/$usb* ; sudo chmod 777 /dev/$usb ; VBoxManage storageattach $vm --medium ~/raw-HD-4-VB/$usb.vmdk --type hdd --storagectl "IDE Controller" --device 0 --port 0 ; VBoxManage startvm $vm
Where
vm --> Name of the virtual machine to start
usb --> Block device to use. (/dev/sdc)
This can used after setup up a boot loader on to my USB pen drive or HDD (After creating Live USB). Here root privilege is needed but not granted to Virtual Box. Thus we can access all our VM.( If we run VBox as root we can't access our VMs). Root privilege is used to
- Unmount the storage device
- Chmod to full access (777)
Requirements:-
1. Device information file (rawvmdk file) created by the following command. Need to run only once. Not bad to run many.
VBoxCreateRawDisk() { VBoxManage internalcommands createrawvmdk -filename ~/.rawHD4VB_`basename "$1"`.vmdk -rawdisk "$1"; }
2. Root privilege to umount & chmod
3. Real storage medium (ie /dev/*) (Non-virtual such as USB HD, pen drive, a partition)
4. A virtual m/c already available (here "usb")
vm=usb; usb=sdc;sudo umount /dev/$usb* ; sudo chmod 777 /dev/$usb ; VBoxManage storageattach $vm --medium ~/raw-HD-4-VB/$usb.vmdk --type hdd --storagectl "IDE Controller" --device 0 --port 0 ; VBoxManage startvm $vm
VBoxBlockBoot() { sudo umount "$2"*; sudo chmod 777 "$2"; VBoxManage storageattach "$1" --medium ~/.rawHD4VB_`basename "$2"`.vmdk --type hdd --storagectl "IDE Controller" --device 0 --port 0 ; VBoxManage startvm "$1"; }
Show Sample Output
Removes all kernels and corresponding packages except of the one you're currently using.
Find which directories on your system contain a lot of files. Edit: much shorter and betterer with -n switch. Show Sample Output
after kernel build with make deb-pkg, I like to install the 4 newest packages that exist in the directory. Beware: might be fewer for you....
Unmounts all CIFS-based network drives. Very nice for shutting down network mounts on a Linux laptop just prior to going to sleep. Show Sample Output
Starts the Nessus daemon, downloads and processes the plugins.
This short snippet outputs the state of all containers available on your system. It is quite helpful to see which ones are running and which are stopped. Please notice that the "sort -u" is needed, otherwise running containers will be reported twice (see output of "lxc-ls" on its own for why) Show Sample Output
Check to see if a port is open or closed on a given host. Show Sample Output
Lets you change/set a governor to handle the frequency of your CPU. Available governors are: "powersave", "conservative", "ondemand", "performance", and "userspace".
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. e.g. sudo cpupower frequency-set -f 1100MHz
commandlinefu.com is the place to record those command-line gems that you return to again and again. 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.
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.
» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10
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: