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1500 questions
141
votes
8 answers

How can I monitor all outgoing requests/connections from my machine?

My machine is a server so I want to ignore connections being made to my server (e.g. when someone visits my website). I want to see only connections/requests being made by my server to other places. How do I see only those outgoing…
trusktr
  • 4,165
141
votes
7 answers

What is /usr/local/bin?

Before today, I've used the terminal to a limited extent of moving in and out of directories and changing the dates of files using the touch command. I had realised the full extent of the terminal after installing a fun script on Mac and having to…
JFW
  • 2,187
141
votes
6 answers

How to pass parameters to an alias?

For bash script, I can use "$@" to access arguments. What's the equivalent when I use an alias?
prosseek
  • 8,558
141
votes
9 answers

The myths about malware in Unix / Linux

Is it possible for my Linux box to become infected with a malware? I haven't heard of it happening to anyone I know, and I've heard quite a few times that it isn't possible. Is that true? If so, what's up with Linux Anti-Virus (security) software?
Stefan
  • 25,300
141
votes
12 answers

How can I fix "cannot find a valid baseurl for repo" errors on CentOS?

I finished installing CentOS 6, but when I tried running yum update I got: [root@centos6test ~]# yum update Loaded plugins: fastestmirror, refresh-packagekit Determining fastest mirrors Could not retrieve mirrorlist…
shivshankar
  • 1,538
140
votes
5 answers

last time file opened

Is it possible to get the time when file was opened last time and sort all files in a directory by those times?
student
  • 18,305
140
votes
10 answers

File permission issues with shared folders under Virtual Box (Ubuntu Guest, Windows Host)

I am using Ubuntu on Virtual Box and I have a folder which is shared between the host (Windows) and the VM (Ubuntu). When I open any file in the share folder in Ubuntu, I can not change it as its owner is set to root. How can I change the ownership…
user654019
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140
votes
4 answers

What is the difference between ~/.profile and ~/.bash_profile?

What is the difference between ~/.profile and ~/.bash_profile?
lakshmen
  • 6,241
140
votes
18 answers

Quickly calculate date differences

I often want to make some quick date calculations, such as: What is the difference between these two dates? What is the date n weeks after this other date? I usually open a calendar and count the days, but I think there should be a program/script…
daniel kullmann
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140
votes
4 answers

Copy the contents of a file into the clipboard without displaying its contents

How to copy the contents of a file in UNIX without displaying the file contents. I don't want to cat or vi to see the contents. I want to copy them to clipboard so that I can paste it back on my windows notepad. I can't copy the file from that…
Web Nash
  • 2,283
140
votes
11 answers

How to follow links in linux man pages?

Is there a way to follow the links mentioned in a man page? For example, here's the man page for ps; how do I access the underlined link circled in red in the screenshot: top(1)?
its_me
  • 13,959
140
votes
12 answers

List packages on an apt based system by installation date

How can I list installed packages by installation date? I need to do this on debian/ubuntu. Answers for other distributions would be nice as well. I installed a lot of stuff to compile a certain piece of code, and I want to get a list of the…
Elazar Leibovich
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139
votes
10 answers

How to unzip a multipart (spanned) ZIP on Linux?

I need to upload a 400mb file to my web server, but I'm limited to 200mb uploads. My host suggested I use a spanned archive, which I've never done on Linux. I created a test in its own folder, zipping up a PDF into test.zip.001, .002, and .003. How…
Tim
  • 1,493
139
votes
16 answers

How to connect to a serial port as simple as using SSH?

Is there a way to connect to a serial terminal just as you would do with SSH? There must be a simpler way than tools such as Minicom, like this $ serial /dev/ttyS0 I know I can cat the output from /dev/ttyS0 but only one way communication is…
norq
  • 4,081
139
votes
7 answers

Redirecting stdout to a file you don't have write permission on

When you attempt to modify a file without having write permissions on it, you get an error: > touch /tmp/foo && sudo chown root /tmp/foo > echo test > /tmp/foo zsh: permission denied: /tmp/foo Sudoing doesn't help, because it runs the command as…
Michael Mrozek
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