Plank has a hidden settings window for developers/OEMs.
- Hold down Control and right click anywhere on the dock
- Select “Preferences”
- make changes.
Plank has a hidden settings window for developers/OEMs.
1. ls list all the contents of a directory (Display One File Per Line Using ls -1 | Display File Size in Human Readable Format Using ls -lh | Display Hidden Files Using ls -a (or) ls -A | )
2. ll list all the contents of a directory with its permissions, size etc
3. cd / cd .. move in an out of directories
4. mv / cp: Copy file1 to file2 preserving the mode, ownership and timestamp.
$ cp -p file1 file2
Copy file1 to file2. if file2 exists prompt for confirmation before overwritting it.
$ cp -i file1 file2
mv command examples
Rename file1 to file2. if file2 exists prompt for confirmation before overwritting it.
$ mv -i file1 file2
Note: mv -f is just the opposite, which will overwrite file2 without prompting.
mv -v will print what is happening during file rename, which is useful in some cases.
$ mv -v file1 file2
5. man to find documentation about a command
6. mkdir: to make a directory
mkdir command examples Following example creates a directory called temp under your home directory.
$ mkdir ~/temp
Create nested directories using one mkdir command. If any of these directories exist already, it will not display any error. If any of these directories doesn’t exist, it will create them.
$ mkdir -p dir1/dir2/dir3/dir4/
7. rmdir to delete a directory
8. touch to create an empty file
9.rm to remove a file
10. clear (same as cls in winows) clear the clutter from terminal window
11. rm -rf / << the command that we should never use. it will clean the whole system.
12.TAR: Create a new tar archive.
$ tar cvf archive_name.tar dirname/
Extract from an existing tar archive.
$ tar xvf archive_name.tar
View an existing tar archive.
$ tar tvf archive_name.tar
13. grep : to extract data. check example.
nesi@Alpha:~$ ip route default via 192.168.1.1 dev enp7s0 proto static metric 100 default via 192.168.75.3 dev wlp6s0 proto static metric 600 192.168.1.0/24 dev enp7s0 proto kernel scope link src 192.168.1.95 metric 100 192.168.75.0/24 dev wlp6s0 proto kernel scope link src 192.168.75.94 metric 600 192.168.250.0/24 dev anbox0 proto kernel scope link src 192.168.250.1 nesi@Alpha:~$ ip route | grep default default via 192.168.1.1 dev enp7s0 proto static metric 100 default via 192.168.75.3 dev wlp6s0 proto static metric 600
14. sudo / su:
su command examples : Switch to a different user account using su command. Super user can switch to any other user without entering their password. some linux distributions nowadays only allow sudo.
$ su - USERNAME
Execute a single command from a different account name. In the following example, john can execute the ls command as raj username. Once the command is executed, it will come back to john’s account.
[john@dev-server]$ su - raj -c 'ls' [john@dev-server]$
Sudo: is same like “run as administrator” in windows
15. pwd (print working directory) show us the current directory in which the terminal is running on.
16. ps show currently running processes
17. passwd command : Change your password from command line using passwd. This will prompt for the old password followed by the new password.
Super user can use passwd command to reset others password. This will not prompt for current password of the user.
# passwd USERNAME
Remove password for a specific user. Root user can disable password for a specific user. Once the password is disabled, the user can login without entering the password.
# passwd -d USERNAME
18. ifconfig command : Use ifconfig command to view or configure a network interface on the Linux system.View all the interfaces along with status.
$ ifconfig -a
Start or stop a specific interface using up and down command as shown below.
$ ifconfig eth0 up $ ifconfig eth0 down
set IP and SM :
$ ifconfig eth0 192.168.50.5 netmask 255.255.255.0
19. uname command : Uname command displays important information about the system such as — Kernel name, Host name, Kernel release number,
Processor type, etc.,Sample uname output from a Ubuntu laptop is shown below.
$ uname -a Linux Alpha 4.10.0-35-generic #39~16.04.1-Ubuntu SMP Wed Sep 13 09:02:42 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
20. whatis command : Whatis command displays a single line description about a command.
$ whatis ls ls (1) - list directory contents $ whatis ifconfig ifconfig (8) - configure a network interface
21. whereis command : When you want to find out where a specific Unix command exists (for example, where does ls command exists?), you can execute the following command.
$ whereis ls ls: /bin/ls /usr/share/man/man1/ls.1.gz
22. locate command : Using locate command you can quickly search for the location of a specific file (or group of files). Locate command uses the database created by updatedb. The example below shows all files in the system that contains the word crontab in it.
$ locate crontab /etc/anacrontab /etc/crontab /usr/bin/crontab /usr/share/doc/cron/examples/crontab2english.pl.gz /usr/share/man/man1/crontab.1.gz
23. tail command : read a text file on terminal.
usage examples: Print the last 10 lines of a file by default.
$ tail filename.txt
Print N number of lines from the file named filename.txt N refers to the number of lines you want to print
$ tail -n N filename.txt
View the content of the file in real time using tail -f. This is useful to view the log files, that keeps growing. The command can be terminated using CTRL-C.
$ tail -f log-file
24. less command : less is very efficient while viewing huge log files, as it doesn’t need to load the full file while opening.
$ less huge-log-file.log
One you open a file using less command, following two keys are very helpful.
CTRL+F – forward one window CTRL+B – backward one window
25. Kill Command – Kill the process by specifying its PID: to kill conventions by sending the TERM signal to the specified process. For the signals, either the signal name or signal number can be used. You need to lookup the pid (process ID) for the process and give it as an argument to kill. Use PS or Top to find pid
nesi@Alpha:~$ ps PID TTY TIME CMD 11671 pts/1 00:00:00 bash 12194 pts/1 00:00:00 ps nesi@Alpha:~$ top 9658 nesi 20 0 1790380 367880 32344 S 12.5 9.3 1:00.76 chromium-b+ 3604 nesi 9 -11 592688 6124 4160 S 6.2 0.2 3:39.36 pulseaudio 12212 nesi 20 0 59776 3524 2948 R 6.2 0.1 0:00.01 top 1 root 20 0 185312 2104 840 S 0.0 0.1 0:01.52 systemd 2 root 20 0 0 0 0 S 0.0 0.0 0:00.01 kthreadd 4 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:+ 6 root 20 0 0 0 0 S 0.0 0.0 0:00.15 ksoftirqd/0 nesi@Alpha:~$ kill 9658
in this case the kill command will kill the chromium app
26. Xkill Command – kill a client by X resource: xkill is the simplest way to kill a malfunctioning program. When you want to kill a process, initiate xkill which will offer an cross-hair cursor. Click on the window with left cursor which will kill that process. command: xkill
27. top shows information about the top processes in the system (sorted by CPU usage by default): top may not be installed by default. Htop is another app that gives a more detailed approach to this purpose.
28. alias : to assign an alias for a command. for example, to update our package repositories we need to run “ sudo apt-get update” which is a long command. using alias we can make it shorter like may be “update” see the another example below:
we often ping to google to check if our internet is working.
nesi@Alpha:~$ ping 184.108.40.206 PING 220.127.116.11 (18.104.22.168) 56(84) bytes of data. 64 bytes from 22.214.171.124: icmp_seq=1 ttl=58 time=87.8 ms 64 bytes from 126.96.36.199: icmp_seq=2 ttl=58 time=86.4 ms 64 bytes from 188.8.131.52: icmp_seq=3 ttl=58 time=86.6 ms 64 bytes from 184.108.40.206: icmp_seq=4 ttl=58 time=87.2 ms nesi@Alpha:~$ alias g='ping 220.127.116.11' nesi@Alpha:~$ g PING 18.104.22.168 (22.214.171.124) 56(84) bytes of data. 64 bytes from 126.96.36.199: icmp_seq=1 ttl=58 time=87.5 ms 64 bytes from 188.8.131.52: icmp_seq=2 ttl=58 time=86.5 ms 64 bytes from 184.108.40.206: icmp_seq=3 ttl=58 time=86.7 ms
29. apt / apt-get | install, update, dist-upgrade, remove etc : APT-GET How to
30. hostname : display the host name of the system (in case if you want to change the hostname of your laptop, you have to do it inside /etc/hosts file. open it up in gedit or any other text editor and change it. Ex: “sudo gedit /etc/hosts” )
31. uptime – Reports how long the system has been running since last boot. Extremely useful for servers.
32. lsb_release -a or –all: Displays some relevan all of the above information. For instance, if you are running Arch Linux, this will display
LSB Version: 1.4 (lsb_release is part of a software package called the LSB core, which is not necessarily installed on your system by default. to install on ubuntu: sudo apt-get update && sudo apt-get install lsb-core | on CentOS :sudo yum update && sudo yum install redhat-lsb-core)
Distributor ID: Arch
Description: Arch Linux
33. who : shows the list of currently logged in users.
34. shutdown: shuts down your computer. You can use
shutdown -r to restart your computer. (you may have to run it as root, sudo /su)
I read about this error before but never faced it, until today.
I ran a
sudo apt-get update && sudo apt-get upgrade && sudo apt-get dist-upgrade to make my lap up to date. and ended up with to problems. Hopefully I can Fix them. 1. Pantheon-Mail now stretches horizontally across the screen. 2. when I click “network settings” from drop-down menu of network icon on wing panel, it opens “system settings”.
after a brief googling I found solution for the first one.
kill or close pantheon-mail then run the following command on terminal.
dconf reset -f /org/pantheon/mail/
Which will reset the settings of Mail to default. For me after running this it was solved.
(some user said this is not a permanent solution and i may have to run the same when it appears again! )
Create a file name .bash_aliases in home directory
Then when we need to create a alias open that file in text editor(in my case: Gedit) with root privileges.
sudo gedit ~/.bash_aliases
then create whatever alias you want inside the text file
alias update="sudo apt-get update"
and save the text file.
as you may have noticed I assigned “update” to “sudo apt-get update”
now whenever I type in the command ‘Update’ on to the terminal it will run “sudo apt-get update”
In the latest versions of Ubuntu,
~/.bashrc automatically sources
~/.bash_aliases, so permanent aliases are best put into this file instead. previously we used to put permanent aliases on
In my laptop Libinput is used as my touch-pad driver. this solution is for Libinput. you may have Synaptic as your driver. to check this open terminal and run
in mine this will give the following result yours may differ.
nesi@Alpha:~$ xinput --list ⎡ Virtual core pointer id=2 [master pointer (3)] ⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)] ⎜ ↳ DLL0651:00 06CB:2985 id=11 [slave pointer (2)] ⎣ Virtual core keyboard id=3 [master keyboard (2)] ↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)] ↳ Power Button id=6 [slave keyboard (3)] ↳ Video Bus id=7 [slave keyboard (3)] ↳ Power Button id=8 [slave keyboard (3)] ↳ Sleep Button id=9 [slave keyboard (3)] ↳ Integrated_Webcam_HD id=10 [slave keyboard (3)] ↳ AT Translated Set 2 keyboard id=12 [slave keyboard (3)] ↳ Dell WMI hotkeys id=13 [slave keyboard (3)]
Mine is a dell laptop for some reason name of my touch-pad driver is not detected properly. “DLL0651:00 06CB:2985 id=11” this is my touch-pad. if yours is synaptic you’ll see that written here instead.
note the id of the device. mine is 11. then in terminal run the following command to check what options are turned on. [by default a zero = false, and one = true ]
xinput list-props 11
this will list all options of your touchpad
xinput list-props 11 Device 'DLL0651:00 06CB:2985': Device Enabled (140): 1 Coordinate Transformation Matrix (142): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000 libinput Tapping Enabled (275): 1 libinput Tapping Enabled Default (276): 0 libinput Tapping Drag Enabled (277): 1 libinput Tapping Drag Enabled Default (278): 1 libinput Tapping Drag Lock Enabled (279): 0 libinput Tapping Drag Lock Enabled Default (280): 0 libinput Tapping Button Mapping Enabled (281): 1, 0 libinput Tapping Button Mapping Default (282): 1, 0 libinput Accel Speed (283): -0.508333 libinput Accel Speed Default (284): 0.000000 libinput Natural Scrolling Enabled (285): 0 libinput Natural Scrolling Enabled Default (286): 0 libinput Send Events Modes Available (260): 1, 1 libinput Send Events Mode Enabled (261): 0, 0 libinput Send Events Mode Enabled Default (262): 0, 0 libinput Left Handed Enabled (287): 0 libinput Left Handed Enabled Default (288): 0 libinput Scroll Methods Available (289): 1, 1, 0 libinput Scroll Method Enabled (290): 1, 0, 0 libinput Scroll Method Enabled Default (291): 1, 0, 0 libinput Click Methods Available (292): 1, 1 libinput Click Method Enabled (293): 1, 0 libinput Click Method Enabled Default (294): 1, 0 libinput Middle Emulation Enabled (295): 0 libinput Middle Emulation Enabled Default (296): 0 libinput Disable While Typing Enabled (297): 1 libinput Disable While Typing Enabled Default (298): 1 Device Node (263): "/dev/input/event12" Device Product ID (264): 1739, 10629 libinput Drag Lock Buttons (299): libinput Horizontal Scroll Enabled (300): 1
check the last option it reads “libinput Horizontal Scroll Enabled (300): 1 “ which means Horizontal scroll is enabled,(value 1 means true). and ID number of the option is 300 given in bracket. In yours ID may be different.
Disable while typing is the option available for Palm Detection. by default it was enabled on my device. if your is showing value 0. note the ID of this option as well.
to change the value of Horizontal scrolling from 1 to 0, type in the following command
xinput set-prop 11 300 0
set-prop: set property
11 : ID of the device whose property is being changed
300 : ID of the option available.
0 : zero to make the value “false”
[in case you want to turn it back on: xinput set-prop 11 300 1 ]
Doing the above will turn off the horizontal scroll for the current section.
if you want to make this change permanent, add that command to startup
settings >> applications >> startup >> click the + button to add new >> custom command >> type in the command : xinput set-prop 11 300 0
IDs will be different in your system. thats all.
Do the same for any options you need.
[ Update: In case you connect another pointing device later, make sure you connect them after the system has finished loading OS. because otherwise there is a small chance that the ID of your touchpad may change. Today I connected my usb mouse before loading os. and ID of my touchpad changed from 11 to 12, thus my startup command didn’t run. ]
When I boot my laptop, Bluetooth was on by default:
after searching a while I found it is possible to set it to off when I start up my laptop:
To do this we will edit the “rc.local” file and add a command “rfkill block bluetooth”
step 1. Open rc.local as root in a text editor. in my case I used Gedit.
sudo gedit /etc/rc.local
It will open the rc.local file. Just add the following line just before the last line (which is “exit 0”. )
rfkill block bluetooth
Restart your PC to confirm the change.
$ alsactl restore
And that’s that! 🙂
I ran into this problem when I connected an aux cable to headphone jack, nothing works when connected on that jack anymore. Above command fixed the issue asap.
LibreOffice 5.3 comes with plenty of new features. The most awaited ribbon interface which is a immensely popular in Microsoft Office is now available in the latest release.
INSTALL LIBREOFFICE 5.3 IN UBUNTU, LINUX MINT, AND ELEMENTARY OS
LibreOffice 5.3 is not yet propagated into the official repositories. Therefore apt-get command will not fetch the latest version. If you already have LibreOffice installed, you should be having version 5.1 as of today (Feb 8, 2017). You can check your LibreOffice version by opening one of the applications from the suite, then click ‘Help’ > ‘About’.
UNINSTALL OLDER VERSION OF LIBREOFFICE
STEP 1: Launch ‘Terminal’
STEP 2: Run the following command. Elementary OS users first may need to enable PPA before attempting the below command. This command will remove the LibreOffice suite from your PC.
sudo apt-get remove libreoffice-core
STEP 3: Finally, we shall clean the configuration files using purge command:
sudo apt-get remove --purge libreoffice-core
That’s it. Older version of LibreOffice is now uninstalled from your PC. You can go ahead and install LibreOffice 5.3.
STEP 1: Since PPA doesn’t have the 5.3 version yet, you need to download the debian binary package (.deb) from official website.
STEP 2: I will assume that the downloaded file goes to ‘Downloads’ directory. Extract the contents.
STEP 3: Launch ‘Terminal’.
STEP 4: Navigate into the Downloads directory.
STEP 5: Use ls command to see the folder contents:
STEP 6: Copy the folder name which was extracted. You have to select the file name and then right-click ‘Copy’.
STEP 7: In my case, it’s a 64-bit version. So I would go into the LibreOffice_220.127.116.11_Linux_x86-64_deb directory.
STEP 8: Now go into DEBS directory where all the installation files are located.
STEP 9: Finally run the dpkg command. and you have finished installing libre Office 5.3 on your computer. Enjoy.
sudo dpkg -i *.deb