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1500 questions
226
votes
8 answers

When does /tmp get cleared?

I'm taking to putting various files in /tmp, and I wondered about the rules on deleting them? I'm imagining it's different for different distributions, and I'm particularly interested in Ubuntu and Fedora desktop versions. But a nice general way of…
John Lawrence Aspden
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226
votes
6 answers

How do I view the details of a digital certificate .cer file?

I am using Windows and have been given a .cer file. How can I view the details of it?
yazz.com
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225
votes
10 answers

How to check if a library is installed?

In Linux, how do I check if a library is installed or not? (from the command line of course). In my specific case now, I want to check whether libjpeg is installed.
hasen
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224
votes
7 answers

How do you add a Windows environment variable without rebooting?

I would like to add an Environment variable to a Windows machine (desktop or server) and be able to use it without rebooting that machine. Say you have a production server which hosts a variety of apps and a new app needs a particular Environment…
Chad Braun-Duin
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223
votes
13 answers

How do I load a sql.gz file to my database? (importing)

I'm trying to import a gzipped SQL file into mysql directly. Is this the right way? mysql -uroot -ppassword mydb > myfile.sql.gz
Alex
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222
votes
14 answers

Shell command to monitor changes in a file

I know there was a command on Unix that I could use to monitor a file and see changes that are getting written to it. This was quite useful especially for checking log files. Do you know what it is called?
Sebastian Hoitz
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222
votes
3 answers

What is the difference between Unix sockets and TCP/IP sockets?

It's from this answer: https://stackoverflow.com/questions/2482411/is-this-pdo-bug-fixed-now/2482424#2482424 When the host is "localhost", MySQL Unix clients use a Unix socket, AKA Unix Domain Socket, rather than a TCP/IP socket for the connection,…
apache
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221
votes
3 answers

How can I override CMD when running a docker image?

I want to inspect a docker image created by someone else with both an entrypoint and cmd specified, for example: ENTRYPOINT ["/usr/sbin/apache2ctl"] CMD ["-D", "FOREGROUND"] I currently do: docker run --interactive --tty --entrypoint=/bin/bash…
warp
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219
votes
13 answers

Any benefit or detriment from removing a pagefile on an 8 GB RAM machine?

I'm running Windows 7 on a dual core, x64 AMD with 8 GB RAM. Do I even need a page file? Will removing it help or hurt performance? Would it make a difference if this is a server or a desktop? Does Windows 7 vs. Windows 2008 make a difference with a…
Jason
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218
votes
11 answers

"Add correct host key in known_hosts" / multiple ssh host keys per hostname?

Trying to ssh into a computer I control, I'm getting the familiar message: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! …
Samuel Edwin Ward
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217
votes
8 answers

Setting the hostname: FQDN or short name?

I've noticed that the "preferred" method of setting the system hostname is fundamentally different between Red Hat/CentOS and Debian/Ubuntu systems. CentOS documentation and the RHEL deployment guide say the hostname should be the…
Cakemox
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213
votes
6 answers

Nginx config reload without downtime

I use nginx as a reverse proxy. Whenever I update the config for it using sudo "cp -r #{nginx_config_path}* /etc/nginx/sites-enabled/" sudo "kill -s HUP `cat /var/run/nginx.pid`" I face a brief downtime. How can I avoid that?
Saurav Shah
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213
votes
11 answers

How to read backward from the end of file in less or more?

I've found one way so far: less +G filename, but it scrolls up line-by-line only with ↑. What's a more powerful less usage which provides scrolling by page, backward pattern search, and so on?
yetanothercoder
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212
votes
16 answers

How do diff over ssh?

How do I diff files/folders across machines provided that the only connectivity available is ssh?
Alexey Timanovsky
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211
votes
18 answers

How to use rsync over FTP

Any unix: I have the following cmd line which works fine. rsync -avr -e ssh /home/dir user@example.com:/home/ But I need to set it up now to rsync to a remote server that only has an FTP server on it. How do I go about that? I looked at the rsync…
bumperbox
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