Most Popular
1500 questions
78
votes
1 answer
Linux LXC vs FreeBSD jail
Are there any notable differences between LXC (Linux containers) and FreeBSD's jails in terms of security, stability & performance?
On first look, both approaches look very similar.
Philipp Claßen
- 4,829
78
votes
5 answers
Pass shell variable as a /pattern/ to awk
Having the following in one of my shell functions:
function _process () {
awk -v l="$line" '
BEGIN {p=0}
/'"$1"'/ {p=1}
END{ if(p) print l >> "outfile.txt" }
'
}
, so when called as _process $arg, $arg gets passed as $1, and used as a…
branquito
- 1,027
78
votes
4 answers
wget with wildcards in http downloads
I need to download a file using wget, however I don't know exactly what the file name will be.
https://foo/bar.1234.tar.gz
According to the man page, wget lets you turn off and on globbing when dealing with a ftp site, however I have a http url.…
spuder
- 18,053
77
votes
1 answer
What does 2>&1 in this command mean?
I understand that this command attempts to write to nowhere or a null device but what does 2>&1 mean here?
wget -q -O - http://yourwebsite.com/wp-cron.php?doing_wp_cron > /dev/null 2>&1
codecowboy
- 3,442
77
votes
9 answers
How do I choose a graphics card for Linux?
I'm building or buying a new Linux system, and I'm trying to select the best graphics card for my needs. How do I go about making this decision?
There's dozens of computer-gear review sites which drool over every detail of new graphics hardware and…
mattdm
- 40,245
77
votes
5 answers
Show PATH in a human-readable way
I want to show my PATH environment variable in a more human-readable way.
$ echo…
Arturo Herrero
- 2,426
77
votes
8 answers
How to make bidirectional pipe between two programs?
Everyone knows how to make unidirectional pipe between two programs (bind stdout of first one and stdin of second one): first | second.
But how to make bidirectional pipe, i.e. cross-bind stdin and stdout of two programs? Is there easy way to do it…
user14284
77
votes
4 answers
Reply on same interface as incoming?
I have a system with two interfaces. Both interfaces are connected to the internet. One of them is set as the default route; a side effect of this is that if a packet comes in on the non-default-route interface, the reply is sent back through the…
Shawn J. Goff
- 46,081
77
votes
11 answers
Backspace, Tab not working in terminal (using ssh)
When I ssh into another machine with Debian with my account(with sudo permissions), my backspace key generates some awkward symbols on pressing. Also Tab & del keys don't work too.
On the other hand, I also have another account on the same machine &…
gopi1410
- 879
77
votes
11 answers
Terminating an infinite loop
I have a command that I want to have run again automatically each time it terminates, so I ran something like this:
while [ 1 ]; do COMMAND; done;
but if I can't stop the loop with Ctrl-c as that just kills COMMAND and not the entire loop.
How…
howard
- 1,342
- 1
- 11
- 16
77
votes
3 answers
What is the difference between ~/.profile, ~/.bashrc, ~/.bash_profile, ~/.gnomerc, /etc/bash_bashrc, /etc/screenrc ...?
Answers to the questions on SO and askubuntu, along with poking through (and reading headers of) $HOME and /etc/, indicate a number of files that can be used to set environment variables, including:
~/.profile
~/.bashrc
~/.bash_profile…
Abe
- 1,681
77
votes
6 answers
Is there ever a reason to use scp instead of rsync?
Is there a reason to use scp instead of rsync? I can see no reason for using scp ever again, rsync does everything that scp does, with more safety (can preserve symlinks etc).
mikebloch
- 889
77
votes
5 answers
How portable are /dev/stdin, /dev/stdout and /dev/stderr?
Occasionally I need to specify a "path-equivalent" of one of the standard IO streams (stdin, stdout, stderr). Since 99% of the time I work with Linux, I just prepend /dev/ to get /dev/stdin, etc., and this "seems to do the right thing". But, for…
kjo
- 15,339
- 25
- 73
- 114
77
votes
4 answers
What's the difference of dmesg output and /var/log/messages?
AFAIK dmesg shows information about kernel and kernel modules, and /var/log/messages also shows information produced by kernel and modules.
So what's the difference? Does /var/log/messages ⊂ output of dmesg?
More Info that may be helpful:
- There…
xanpeng
- 5,725
77
votes
8 answers
Converting relative path to absolute path without symbolic link
Is there a Unix command to get the absolute (and canonicalized) path from a relative path which may contain symbolic links?
Benjamin
- 1,515