Run application with full features without sudo command in ubuntu

Harshad
Member • Nov 18, 2013

Run application with full features without sudo command in ubuntu

Hello Friends,

I have just started working with Linux platform and I am using ubuntu.
I have installed application KCalc and if I run this application directly it runs with some limited features. If I need to access full features then I need to run this application from terminal by sudo command.

My question is that Is there any way so I can run this application directly with full features?

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Abhishek Rawal

Member • Nov 18, 2013

@#-Link-Snipped-#
You use sudo kcalc to switch modes right ?
Why to use Kcalc, when Calculator is already available by default in Ubuntu ?

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Abhishek Rawal

Member • Nov 18, 2013

BTW some information that might help you in future.

- Ubuntu is using Gnome shell, hence it is Gnome fork. Gnome is based on GTK+ toolkit ;While KDE is based on QT toolkit.
(What is QT & GTK ? They are GUI toolkits, libraries that developers use to design GUI interface, which runs atop Xorg display server)
Note : You might've noticed the difference in looks in Calculator that comes by default in Ubuntu (GTK based) & Kcalc (QT based,comes by default in KDE)

- From above you understood that Gnome uses GIMP toolkit (GTK+) while KDE uses (QT toolkit), Now Kcalc which you downloaded is written in QT, so when you download KDE apps in Gnome, it will work obviously (GTK apps works in QT too) but it pulls lot of dependencies with it, this won't break anything but it can consume lot of resource in background, eventually slowing down your computer, which you don't want.
What I mean is, as long as application using GTK is available, there is no need in downloading QT based app. It's just waste of resources.

- Ubuntu have huge repository, it includes almost all DEs : KDE, Gnome, LXDE, XFCE, Mate,etc. so sometimes there are chance that you install a app which pull in entire DE into the system, eventually making your system a bloat. (Just think about an OS running with 4-5 DEs!)
My suggestion is, use 'synaptic' it's wonderful tool, which will help you to keep an eye on dependencies too while installing it.

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Harshad Italiya

Member • Nov 18, 2013

Abhishek Rawal
@#-Link-Snipped-#
You use sudo kcalc to switch modes right ?
Why to use Kcalc, when Calculator is already available by default in Ubuntu ?

Agree but that default calculator is also running with less features. There are no option for mode change.
Have a look at this.

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Abhishek Rawal

Member • Nov 18, 2013

Open terminal & type
sudo apt-get install gcalctool

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Harshad Italiya

Member • Nov 19, 2013

Abhishek Rawal
Open terminal & type
sudo apt-get install gcalctool
Here is the response on terminal.

Reading package lists... Done
Building dependency tree
Reading state information... Done
gcalctool is already the newest version.
The following packages were automatically installed and are no longer required:
gir1.2-ubuntuoneui-3.0 language-pack-kde-en kde-l10n-engb libubuntuoneui-3.0-1 thunderbird-globalmenu language-pack-kde-en-base
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

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Abhishek Rawal

Member • Nov 19, 2013

@#-Link-Snipped-#

Which means already installed.Which version of gcalctool are you using ? Is it 6.4.1.1 ?

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Abhishek Rawal

Member • Nov 19, 2013

@#-Link-Snipped-# Which means it's already installed.
Open 'Calculator', Select Calculator option -> Preferances

Another dialogue box will open, In 'Number Format' option : Select the option which you need.

It will work now.

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Harshad Italiya

Member • Nov 19, 2013

Abhishek Rawal
@#-Link-Snipped-# Which means it's already installed.
Open 'Calculator', Select Calculator option -> Preferances

Another dialogue box will open, In 'Number Format' option : Select the option which you need.

It will work now.
Oh ! I was not looking at main menu bar. Options are there. Thanks @#-Link-Snipped-#
Please be ready for such threads in upcoming days. 😉

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Abhishek Rawal

Member • Nov 19, 2013

Anytime, Harshad bhai.
Linux have steep learning curve, but once you understand it. Linux is fun to use.
Just don't quit on it. Good luck 👍

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Harshad Italiya

Member • Nov 20, 2013

@#-Link-Snipped-# :- I am using Cutecom and I am not able to open com port without application running via sudo command. Any Solution?

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Abhishek Rawal

Member • Nov 20, 2013

Harshad Italiya
@#-Link-Snipped-# :- I am using Cutecom and I am not able to open com port without application running via sudo command. Any Solution?
You won't be able to access ports w/o sudo unless you set permission. (or you might've to set udev rules)

sudo chmod 755 <port_location>
( eg: sudo chmod 755 /dev/tty0 )

Tell me the port & I will give you exact command.
------------------------------------------------------------------------------------
Even that doesn't work then add your user to tty & dialout.

sudo usermod -a -G tty YOUR_USERNAME
sudo usermod -a -G dialout YOUR_USERNAME

Edit : Post Merged.

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Kaustubh Katdare

Administrator • Nov 20, 2013

^ is why Linux isn't popular with non-techie computer users. 👎

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Anand Tamariya

Member • Nov 21, 2013

Kaustubh Katdare
^ is why Linux isn't popular with non-techie computer users. 👎
Really??? Normal users like to play with serial port??

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Harshad Italiya

Member • Nov 21, 2013

Abhishek Rawal
You won't be able to access ports w/o sudo unless you set permission. (or you might've to set udev rules)

sudo chmod 755 <port_location>
( eg: sudo chmod 755 /dev/tty0 )

Tell me the port & I will give you exact command.
------------------------------------------------------------------------------------
Even that doesn't work then add your user to tty & dialout.

sudo usermod -a -G tty YOUR_USERNAME
sudo usermod -a -G dialout YOUR_USERNAME

Edit : Post Merged.
Ok. I will try this and update you about the result. BTW I am using serial port as well as USB to Serial Converter both.

Kaustubh Katdare
^ is why Linux isn't popular with non-techie computer users. 👎
😏

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Harshad Italiya

Member • Nov 21, 2013

I tried with this command:- sudo chmod 755 /dev/ttys1
response:- chmod: cannot access `/dev/ttys1': No such file or directory

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Anand Tamariya

Member • Nov 22, 2013

You should be looking at /dev/ttyUSB0 since you are using USB to serial convertor.

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Harshad Italiya

Member • Nov 22, 2013

Anand Tamariya
You should be looking at /dev/ttyUSB0 since you are using USB to serial convertor.
I am also using S0 and S1

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Anand Tamariya

Member • Nov 22, 2013

The command for listing directory contents in linux is "ls". All the devices in linux are enlisted under /dev. IO devices are typically named with suffix "tty". And filenames are case sensitive in linux. This info. should help you find the file you are interested in.

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Abhishek Rawal

Member • Nov 22, 2013

@#-Link-Snipped-# as device is usually attached with 'dialout' usergroup, you need to add your user in dialout.
sudo usermod -a -G dialout 'your_username'

or,
sudo adduser <your_username> dialout
Reboot.

----------------------------------------

I would like to know the o/p of
ls -l /dev/ttyUSB0

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Harshad Italiya

Member • Nov 22, 2013

Abhishek Rawal
I would like to know the o/p of
ls -l /dev/ttyUSB0
crw-rw---- 1 root dialout 188, 0 Nov 23 13:38 /dev/ttyUSB0

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Abhishek Rawal

Member • Nov 23, 2013

Harshad Italiya
crw-rw---- 1 root dialout 188, 0 Nov 23 13:38 /dev/ttyUSB0
I have mentioned two times in my above posts, it seems like you've missed it.So, I will repeat again.

Open terminal & type :
sudo usermod -a -G dialout <username>

Or,Open terminal & type :
sudo adduser <username> dialout
Reboot PC.

One other way is,
- Connect hardware (usb)
- Open terminal & type : sudo chmod 666 <port_location>
{you can use 775 or 777 any permission as per your will}
- You'll be able to access now.
Note : One thing I noted that once you remove hardware, the permission is set back to default i.e root permission.Hence I suggest you to add your user by usermod as i mentioned.

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Harshad Italiya

Member • Nov 24, 2013

Abhishek Rawal
I have mentioned two times in my above posts, it seems like you've missed it.So, I will repeat again.

Open terminal & type :
sudo usermod -a -G dialout <username>

Or,Open terminal & type :
sudo adduser <username> dialout
Reboot PC.

One other way is,
- Connect hardware (usb)
- Open terminal & type : sudo chmod 666 <port_location>
{you can use 775 or 777 any permission as per your will}
- You'll be able to access now.
Note : One thing I noted that once you remove hardware, the permission is set back to default i.e root permission.Hence I suggest you to add your user by usermod as i mentioned.
Perfect !

Now I can open COM port without running application by sudo command.
I follow this step.
sudo usermod -a -G dialout <username>
Reboot PC
And it's working like charm. 😀

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