Commands tagged cache sorted by votes

Commands tagged cache (13)

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prevent large files from being cached in memory (backups!)

We all know... nice -n19 for low CPU priority. ionice -c3 for low I/O priority. nocache can be useful in related scenarios, when we operate on very large files just a single time, e.g. a backup job. It advises the kernel that no caching is required for the involved files, so our current file cache is not erased, potentially decreasing performance on other, more typical file I/O, e.g. on a desktop. http://askubuntu.com/questions/122857 https://github.com/Feh/nocache http://packages.debian.org/search?keywords=nocache http://packages.ubuntu.com/search?keywords=nocache To undo caching of a single file in hindsight, you can do cachedel <OneSingleFile> To check the cache status of a file, do cachestats <OneSingleFile>
This is sample output - yours may be different.
21

nocache <I/O-heavy-command>

michelsberg · 2013-05-21 15:15:05 10
Load file into RAM (cache) for faster accessing for repeated usage

Best result when file size less than half of RAM size
This is sample output - yours may be different.
9

cat <file> > /dev/null

totti · 2011-11-12 15:45:27 5
Clear filesystem memory cache

Found here: http://ubuntuforums.org/showthread.php?t=589975
This is sample output - yours may be different.
8

sync && echo 3 | sudo tee /proc/sys/vm/drop_caches

mariusbutuc · 2011-10-18 15:22:25 11
Grab a list of MP3s out of Firefox's cache

Ever gone to a site that has an MP3 embedded into a pesky flash player, but no download link? Well, this one-liner will yank the names of those tunes straight out of FF's cache in a nice, easy to read list. What you do with them after that is *ahem* no concern of mine. ;) Show Sample Output
This is sample output - yours may be different.
```
4CF25EB3d01
```
4

for i in `ls ~/.mozilla/firefox/*/Cache`; do file $i | grep -i mpeg | awk '{print $1}' | sed s/.$//; done

BoxingOctopus · 2010-04-11 23:14:18 6
Grab a list of MP3s out of Firefox's cache

Grab a list of MP3s (with full path) out of Firefox's cache Ever gone to a site that has an MP3 embedded into a pesky flash player, but no download link? Well, this one-liner will yank the *full path* of those tunes straight out of FF's cache in a clean list. Shorter and Intuitive version of the command submitted by (TuxOtaku) Show Sample Output
This is sample output - yours may be different.
```
/home/sata/.mozilla/firefox/xmr8lfrq.default/Cache/FD44AC63d01
/home/sata/.mozilla/firefox/xmr8lfrq.default/Cache/C4C20071d01
/home/sata/.mozilla/firefox/xmr8lfrq.default/Cache/CD40802Cd01
```
2

find ~/.mozilla/firefox/*/Cache -exec file {} \; | awk -F ': ' 'tolower($2)~/mpeg/{print $1}'

sata · 2010-04-19 06:59:55 2
Clear filesystem memory cache
This is sample output - yours may be different.
2

sysctl -w vm.drop_caches=3

sanidhya_k · 2011-10-18 18:23:38 6
Empty Bind9 cache

Occasionally, to force zone updating, cache flush is necessary. The use of this command is better than restart the Bind9 process.
This is sample output - yours may be different.
2

rndc flush

ironmarc · 2011-10-21 14:27:05 3
Clean or clean pacman and pamac cache
This is sample output - yours may be different.
2

sudo pacman -Scc && pamac clean -b

bugmenot · 2022-08-24 19:10:38 237
clear MyDNS-ng cache

Occasionally, to force zone updating, cache flush is necessary. This command is better than restart the mydns daemon.
This is sample output - yours may be different.
1

kill -SIGHUP `cat /var/run/mydns.pid`

ironmarc · 2011-10-21 14:29:24 6
Flush DNS in Mac OS X
This is sample output - yours may be different.
0

dscacheutil ?flushcache

edshadi · 2012-07-04 17:04:52 2
To see which software currently open in directory /var/cache
This is sample output - yours may be different.
0

lsof -Pn +D /var/cache/ | awk '{print $1}' | sort | uniq

olto · 2015-11-12 05:30:44 6
Clear Cached Memory on Ubuntu

Clear Cached Memory on Ubuntu based distributions, and also display memory status. Please do not use this on a production machine unless you really really know what you are doing. Echo 3 is a kinder way of purging the memory, you can also use 'echo 2' or 'echo 1' if #1 You know what you are doing, and #2 refer to number 1 :-)
This is sample output - yours may be different.
0

sudo free && sync && sudo echo 3 | sudo tee /proc/sys/vm/drop_caches

tg0000 · 2021-09-13 16:45:20 220
Clear Cached Memory on Ubuntu

"That's it. Not much to see here. The first command writes any cache data that hasn't been written to the disk out to the disk. The second command tells the kernel to drop what's cached. Not much to it. This invalidates the write cache as well as the read cache, which is why we have the sync command first. Supposedly, it is possible to have some cached write data never make it to disk, so use it with caution, and NEVER do it on a production server. You could ... but why take the risk? As long as you are running a post 2.6.16 kernel,..." Source: http://ubuntuforums.org/showpost.php?p=3621283&postcount=1
This is sample output - yours may be different.
-1

sudo sync && sudo echo 3 | sudo tee /proc/sys/vm/drop_caches

StephenJudge · 2012-03-17 08:27:58 11

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Recursively remove 0kb files from a directory

Shows space used by each directory of the root filesystem excluding mountpoints/external filesystems (and sort the output)

Excludes other mountpoints with acavagni's "mountpoint" idea, but with -exec instead of piping to an xargs subshell. Then, calling "du" only once with -exec's "+" option. The first "\! -exec" acts as a test so only those who match are passed to the second "-exec" for du.

mplayer webcam window for screencasts

When recording screencast some people like to have the image from their webcam, so the can show something, that can't be seen on the desktop. So starting mplayer with these parameters you will have a window with no frames, borders whatsoever, and selecting the window a hitting the "F" key you will bring it in fullscreen. if you want to position the frame somewhere else, you could play with the --geomeptry option where 100%:100% mean bottom right corner. The HEIGHT and WIDTH can't be changed as you like, since the most webcams support specified dimensions, so you would have to play with it to see what is supported

Get windows IPv4 and nothing else

May be useful to get user's ip address over the phone, as users struggle to read through a long ipconfig result.

Easily find latex package documentation

If the pdf/dvi/etc documentation for a latex package is already part of your local texmf tree, then texdoc will find and display it for you. If the documentation is not available on your system, it will bring up the package's webpage at CTAN to help you investigate.

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

"at" command w/o the resource usage/competition issues

EXAMPLES jb "next sun 12pm" "/bin/sh ~you/1.sh" & jb "2010-08-29 12:00:00" "~you/1.sh" & jb "29aug2010 gmt" ". ~you/1.sh" & jb 12:00p.m. "nohup ./1.sh" & jb 1min "echo stop!" & SEE ALSO parsedate(3) strftime(3)

sends your internal IP by email

This is useful if you have need to do port forwarding and your router doesn't assign static IPs, you can add it to a script in a cron job that checks if you IP as recently changed or with a trigger script. This was tested on Mac OSX.

Unlock your KDE4 session remotely (for boxes locked by KDE lock utility)

Do the unlock KDE screen saver locked session with lightdm display manager used in Kubuntu 12.10 +

Alias for lazy tmux create/reattach

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Commands tagged cache (13)

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