Opened one too many panes in tmux? You can kill one by selecting it and doing the following:
[prefix] x
By default the prefix is ctrl+b – so in this case you would enter ctrl+b then x.
Pane killed!
Tag: ubuntu
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Ubuntu: Killing a tmux pane
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Ubuntu: Bringing a detached tmux session back
If you’re just starting out with tmux you may have installed it, set up a session, detached and then… what?
To re-join your detached session, simply run:
tmux attach
and you’re back in business.
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Ubuntu: How to change tmux’s ctrl+b binding to ctrl+a
If you’re used to screen you’ll be in the habit of using ctrl+a, for example detaching a session with ctrl+a then d – if you make the move to tmux it’s ctrl+b then d, which can take some getting used to. Often it’s easier to make tmux get used to you! To change tmux from ctrl+b to ctrl+a, make sure tmux isn’t running and create the following file:
vi ~/.tmux.conf
Here we have used the text editor vi to create the file. Now add the following:
unbind C-b
set -g prefix C-a
Save the file. Now the next time you start tmux it should have changed to what you’re used to!
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How to erase a tape in Ubuntu
This is another nice and easy one, though it may take a while depending on the size/speed of the tape:
sudo mt -f [/path/to/tape] erase
e.g.:
sudo mt -f /dev/st0 erase
That’s /dev/st(zero) not /dev/st(letter o), in case it’s not clear from the font. This will likely take some time as the tape is erased from end-to-end – once it is done you will be returned to a prompt.
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How to rewind a tape drive in Ubuntu
This again uses the mt command, and is nice and easy:
sudo mt -f [path/to/tape/drive] rewind
A common example would be:
sudo mt -f /dev/st0 rewind
Easy done! In the above example it’s st (zero) not st (letter o) – in case it’s not clear from the font.
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Changing or Updating the time zone in Ubuntu Server
There are quite a few reasons you may find that you need to change your time zone – for example, if you’re using a pre-made image for a virtual machine you may find that the default timezone is not set to your country. You can change the time manually, though there is a quick and easy way:
sudo dpkg-reconfigure tzdata
This reconfigures the tzdata (timezone data) package and runs you through a series of prompts asking which country/city you live in, and updates the time accordingly.
You can check the current system time with:
date
to verify that it worked!
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Installing Xen on Ubuntu: Error “makeinfo is missing on your system”
This is another error that seems to crop up when making Xen on Ubuntu – you can fix it by installing the texinfo package:
sudo apt-get install texinfo
The error message should now no longer appear.
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Installing Xen on Ubuntu: Error bits/predefs.h: No such file or directory
This error cropped up when we were building Xen on a system running Ubuntu 12.04 Server:
/usr/include/features.h:324:26: fatal error: bits/predefs.h: No such file or directory
To get past this point, install gcc-multilib.
sudo apt-get install gcc-multilib
The required files are around 20MB and should allow you to get past that point of “make”.
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Ubuntu: How to delete a user
In Ubuntu 12.04 and 12.10, to delete an additional user you have created, use the following:
sudo deluser [username]
By example, if we wanted to delete a user we created called “test”, we would run:
sudo deluser test
Which gives:
Removing user `test’ …
Warning: group `test’ has no more members.
Done.
Be careful with this – don’t delete your admin account 🙂
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Ubuntu: How to add a existing user to an existing group
To add an existing user to a second group, use the following command:
sudo usermod -a -G [group] [user]
e.g.:
sudo usermod -a -G geeks bob
This will add the user bob to the group geeks.