Commands tagged cache sorted by votes

Commands tagged cache (12)

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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 3
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 3
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 0
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

TuxOtaku · 2010-04-11 23:14:18 4
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 0
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 0
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 0
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 0
Flush DNS in Mac OS X
This is sample output - yours may be different.
0

dscacheutil ?flushcache

edshadi · 2012-07-04 17:04:52 0
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 1
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 2
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 2

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Password Generation

Produces secure passwords that satisfy most rules for secure passwords and can be customized for correct output as needed. See "man pwgen" for details.

check open ports without netstat or lsof

Unite pdf files

pdfunite is a part of the poppler-utils. poppler-utils package is only 150KB. The alternative - pdftk package is 14MB! Install poppler-utils if you need simple pdf operation commands like unite, separate, info, text/html conversions

Find all active ip's in a subnet

Generate an XKCD #936 style 4 word passphrase (fast)

Some snippets posted are slow on big dictionaries, this one is fast.

Know which modules are loaded on an Apache server

This let you know which modules has loaded the Apache server, very useful to know if the mod_rewrite is ready to use.

exclude a column with cut

Show all columns except 5th. This might help you save some typing if you are trying to exclude some columns from the output.

shutdown pc in a 4 hours

you may as well use shutdown -h 18:32 to shutdown your machine at 18:32.

send DD a signal to print its progress

every 1sec sends DD the USR1 signal which causes DD to print its progress.

run php code inline from the command line

Most people know that you can run a PHP script from the command line like so: $php ./my_script.php But sometimes I just want to run a quick bit of code, the PHP Command Line Interface allows me to do so with the -r option. Requires package php5-cli

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Commands tagged cache (12)

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