This is how you query the package database to see if a package is installed or not. root@neo homer# yum list installed | grep xterm xterm.x86_64 293-1.fc19 @anacondaroot@neo homer# yum list installed | grep xterm xterm.x86_64 293-1.fc19 @anaconda This is a more verbose way of doing this. root@neo homer# yum…
Read MoreUptime. this is a useful command for finding out how long a Linux system has been running for. it also displays the load average over 1.5 and 15 minute intervals. deep-thought ~ # uptime 21:45:32 up 32 min, 3 users, load average: 1.88, 1.45, 1.08deep-thought ~ # uptime 21:45:32 up…
Read MoreMounting an ISO image to a folder and accessing the contents of the image is very simple. Firstly we need to create a directory to mount the image to. |{/mnt/Elements/Files/ISOs}-{Fri Mar 22 23:52:17} -{john@adeptus-mechanicus } $ sudo mkdir /root/img [sudo] password for john:|{/mnt/Elements/Files/ISOs}-{Fri Mar 22 23:52:17} -{john@adeptus-mechanicus } $ sudo…
Read MoreHow to create an ISO image of a DVD or CDR disk easily with the command-line. dd if=/dev/sr0 of=/home/$LOGNAME/mydisk.iso bs=2kdd if=/dev/sr0 of=/home/$LOGNAME/mydisk.iso bs=2k This will rip a copy of the disk to the hard drive. To write this image to a blank DVD disk; use this command. sudo wodim -dev=/dev/sr0…
Read MoreDebian GNU/Linux FAQ. The Debian GNU/Linux FAQ. powered by GetBookee.org. This is the Debian GNU/Linux FAQ, this is a very important resource for any Debian user. Any question you may have can be answered in this resource.
Read MoreI need to correct what I said in this posting: http://www.securitronlinux.com/bejiitaswrath/bash-shell-is-better-than-powershell-and-discussion-of-the-linux-desktop-versus-windows/ and also this one. regarding the Powershell and its handling of certain constructs that I mentioned in this posting: http://www.securitronlinux.com/bejiitaswrath/windows-powershell-not-as-good-as-bash-shell-and-other-thoughts/. It turns out that the Powershell does support this after all as shown in this sample below. PS C:\Users\Homer\Documents>…
Read MoreThis command used with grep will return information about your computers memory. jason@jason-desktop:~/Documents$ cat /proc/meminfo | grep Total MemTotal: 12219468 kB SwapTotal: 70311928 kB VmallocTotal: 34359738367 kB CmaTotal: 0 kB HugePages_Total: 0jason@jason-desktop:~/Documents$ cat /proc/meminfo | grep Total MemTotal: 12219468 kB SwapTotal: 70311928 kB VmallocTotal: 34359738367 kB CmaTotal: 0 kB HugePages_Total:…
Read MoreThe zsh shell is a nice alternative to the bash shell when you are using Linux and want a nice command shell for your day-to-day use. Below is my ~/.zshrc files that I am using now. Type sudo apt-get install zsh to install this in Ubuntu. If you want to…
Read MoreThere are many Linux commands that are available on Android devices when you are using the terminal emulator app. Firstly the ls command. This is used to list files in a directory. Then the cat command; this is used to view the contents of a text file. The mv command…
Read MoreTo get simple information about a Linux command, or to refresh your memory, use the info pages to learn more about the commands. Type info ls for example to get information about the ls command. Type help and then a bash scripting command like ‘echo’, and the help will be…
Read MoreUsing the Linux command-line allows a lot of flexibility when running commands and how they are run. Take the example below for instance. rm `find ./ -name "*~"`rm `find ./ -name "*~"` This command runs a command within backticks and outputs the result as an argument to the rm command….
Read MoreUsing the install-mbr command to install a main boot record (MBR) onto a disk. [flynn@flynn-grid-runner media]$ sudo install-mbr –force –partition 1 /dev/sdi [sudo] password for flynn: [flynn@flynn-grid-runner media]$[flynn@flynn-grid-runner media]$ sudo install-mbr –force –partition 1 /dev/sdi [sudo] password for flynn: [flynn@flynn-grid-runner media]$ This command would be useful if you are building…
Read MoreThis command shows the filesize of an ISO image. -21:19:07– flynn@flynn-grid-runner [/media/Elements/Files/ISOs]$ isosize -d 1024 en_windows_7_ultimate_x64_dvd_x15-65922.iso 3149108-21:19:07– flynn@flynn-grid-runner [/media/Elements/Files/ISOs]$ isosize -d 1024 en_windows_7_ultimate_x64_dvd_x15-65922.iso 3149108 This may also be achieved with the ls command. -21:19:06– flynn@flynn-grid-runner [/media/Elements/Files/ISOs]$ ls -Hula en_windows_7_ultimate_x64_dvd_x15-65922.iso -rw——- 1 flynn flynn 3.1G 17-03-12 10:48 pm en_windows_7_ultimate_x64_dvd_x15-65922.iso-21:19:06– flynn@flynn-grid-runner [/media/Elements/Files/ISOs]$…
Read MoreUsing the Linux last command to view re-boot history. C:\HOME\FLYNN\DOCUMENTS> last reboot reboot system boot 3.4.0-rc2-bejiit Sat Aug 4 12:50 – 14:29 (01:39) reboot system boot 3.4.0-rc2-bejiit Fri Aug 3 21:11 – 21:16 (00:05) reboot system boot 3.4.0-rc2-bejiit Fri Aug 3 20:21 – 20:57 (00:36) reboot system boot 3.4.0-rc2-bejiit Fri…
Read MoreTo view the contents of an ISO image, the isoinfo command for Linux will come in very useful indeed. Just type isoinfo -f -i myiso.iso to view the contents of the ISO image as shown in this example. C:\MEDIA\ELEMENTS\FILES\ISOS> isoinfo -f -i linuxmint-11-gnome-dvd-64bit.iso /BOOT /CASPER /EFI /ISOLINUX /MD5SUM.TXT;1 /PRESEED /_DISK…
Read MoreThe rename command for the Linux shell allows you to rename a directory full of files en-mass. This first example, based on the examples in the rename manual page. Firstly renaming a directory full of xhtml files to the html extension. rename ‘s/\.xhtml$/.html/’ *.xhtmlrename ‘s/\.xhtml$/.html/’ *.xhtml And renaming a folder…
Read MoreFlynn using the UNIX machine in the TRON legacy movie. He is logging in with a user that does not have a home directory defined so the / folder is used instead. This is what happens with a Linux system as well. The second screen-shot shows the /bin/history command being…
Read MoreThe Linux command-line has many powerful tools for viewing and managing running processes on your UNIX/Linux machine. The lsof command is a very useful command, it will display a list of all open files owned by active processes running on your system. Below is an excerpt from the output this…
Read MoreChanging permissions of a file. To add executable permissions for all categories of a file, you would use chmod a+x foo. To add executable permissions for only the current user, you would use: chmod go-wx foochmod go-wx foo Or you could use chmod +x: chmod +x foochmod +x foo That…
Read Morehttp://www.securitronlinux.com/uncategorized/tron-legacy-unix-operating-system/. As seen in this posting above, the Tron Legacy movie used computers with a variant of the Solaris UNIX operating system. The ps -ef command works in the FreeBSD UNIX distribution, you need to mount procfs with this command: mount -t procfs proc /proc this will enable the proc…
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