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1500 questions
340
votes
7 answers

How to run the SSH server on a port other than 22

I have two computers behind the same router. Let's call them A and B. A can SSH to B in the following manner: ssh usr@ B can SSH to A by doing the same, but the external IP must be used. I have forwarded port 22 of my router…
Gary
  • 4,042
339
votes
4 answers

What's the difference between <<, <<< and < < in bash?

What's the difference between <<, <<< and < < in bash?
Searene
  • 4,550
339
votes
5 answers

Give specific user permission to write to a folder using +w notation

I know I can assign the permission to write to an owner/group/others like this: chmod u+w myfolder Can I specify the specific user here? Some like this: chmod username u+w myfolder
Max Koretskyi
  • 3,851
339
votes
9 answers

How do I add SSH Keys to authorized_keys file?

I have an Ubuntu server on Amazon EC2, that I use for development, and today I stupidly cleared everything out of my ~/.ssh/authorized_keys file. Luckily I have an SSH open, so I am still connected, and can fix the file, but when I try to put my…
Dave Long
  • 3,776
339
votes
18 answers

How to restart the networking service?

I tried to use sudo service networking restart and sudo /etc/init.d/network restart but they both crash the window manager and I can no longer use my keyboard for input into X. when I use the /etc/init.d/ method it complains saying that I should…
waspinator
  • 4,942
337
votes
7 answers

How to make partitions mount at startup?

How do you make HDDs and partitions mount at startup on Ubuntu? I always keep my media and data files on separate partitions - one 2tb HDD and a 400 odd gig partition. I have been trying to swap the default folder location for the home directory to…
Harley Baker
  • 3,471
337
votes
7 answers

Is it okay to delete the ~/.cache folder?

When I use disk usage analyzer and scan my home folder, the .cache folder in my home directory always shows up with a decent bit of things in it. Would it be okay for me to delete the contents of this folder or would it damage something?
Aner
  • 3,371
336
votes
8 answers

How can I create a zip archive of a whole directory via terminal without hidden files?

I have a project with lots of hidden folders / files in it. I want to create a zip-archive of it, but in the archive shouldn't be any hidden folders / files. If files in a hidden folder are not hidden, they should also not be included. I know that…
Martin Thoma
  • 20,535
335
votes
23 answers

I have 16GB RAM. Do I need 32GB swap?

I read many places that the rule of thumb for swap space is to double the amount of physical RAM. However, 32 GB does seem a LOT. Do I need that much? Do I need it at all with this high amount of physical RAM?
Tamás Szelei
  • 4,192
334
votes
7 answers

How to access a usb flash drive from the terminal?

I only have access to the command line. I need to backup my data (on the user folder) to a pen (USB DOK). How can I mount a flash drive manually? What should be the copy command?
MEM
  • 11,255
332
votes
12 answers

How to uninstall a .deb package?

Suppose I download a .deb package from a website and install it. (I assume that when I double click the .deb file, the package is installed through a GUI that interfaces with dpkg right?) How can I uninstall it?
Olivier Lalonde
  • 60,581
332
votes
8 answers

Simple image editor?

I want something similar to "preview" in macs. For example: I want an image editor that ONLY does simple adjustments like increase/decrease contrast, saturation, exposure, color tinting.... rotate, flip vertically, flip horizontally, make black and…
mandy
  • 3,341
331
votes
9 answers

Find a file by name using command-line

I would like to determine the location of a file using command-line. I have tried: find . -type f -name "postgis-2.0.0" and locate postgis-2.0.0 to no avail. What is the command to determine the file's directory, provided its name?
Sam007
  • 4,653
329
votes
13 answers

How do you restart Apache?

I switched from SLES to Ubuntu and now I want to restart my local server. In SLES I used: rcapache2 restart but this seems not to work in Ubuntu. How do I restart Apache?
Jai Puri
  • 4,089
328
votes
10 answers

How do I find my internal ip address?

I have Ubuntu server 12.04 installed, so I have no GUI. When I do the command ifconfig, I cannot find my internal IP address. It says: inet addr: 127.0.0.1. Here is the output of ifconfig -a: eth0 link encap:Ethernet HWaddr 00:06:4f:4a:66:f0 …
Cam Jones
  • 3,891
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