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find out true (according to xrandr) monitor DPI

see summary. if you want to set dpi right away try this: xrandr --query | sed -n 's@$[A-Z0-1-]*$.* $.*$x$.*$+.*+.* $[0-9]\+$mm x $[0-9]\+$mm@"--output \1 --dpi ";(\2/\4+\3/\5)*12.7@p;'|bc -l|xargs -L1 xrandr all syntax should be POSIX compliant. Show Sample Output
This is sample output - yours may be different.
```
LVDS-1: 100.96760151825521147108
HDMI-1: 92.60728755320785681297
```
0

xrandr --query | sed -n 's@$[A-Z0-1-]*$.* $.*$x$.*$+.*+.* $[0-9]\+$mm x $[0-9]\+$mm@"\1: ";(\2/\4+\3/\5)*12.7@p;'|bc -l

hydrogenization · 2017-06-23 03:44:40 16
Download audio from youtube video
This is sample output - yours may be different.
0

yt-dlp -f 'ba' -x --audio-format mp3 https://www.youtube.com/watch?v=1La4QzGeaaQ -o '%(id)s.%(ext)s'

swarzynski · 2022-06-19 20:52:35 434
Extract an audio track from a multilingual video file, for a specific language.
This is sample output - yours may be different.
0

mencoder -aid 2 -oac copy file.avi -o english.mp3

prayer · 2009-05-19 19:24:43 7
remove unnecessary architecture code from Mac OS X Universal binaries

ditto can be used to "thinnify" Mach-O Universal binaries to separate unncessary code from your machine. For example, doubleTwist.app shaved off around 10 MB while Google Earth went from 112 MB to 62 MB after extracting only the i386 code from them.
This is sample output - yours may be different.
0

ditto --arch i386 doubleTwist.app doubleTwist_i386.app

thebillywayne · 2009-06-22 23:59:14 12
Get a url, preview it, and save as text - with prompts

Thanks th John_W for suggesting the fix allowing ~/ to be used when saving a directory. directions: Type in a url, it will show a preview of what the file will look like when saved, then asks if you want to save the preview and where you want to save it. Great for grabbing the latest commandlinefu commands without a full web browser or even a GUI. Requires: w3m Show Sample Output
This is sample output - yours may be different.
```
*(me)*@ubuntu:~$ read -p "enter url:" a ; w3m -dump $a > /dev/shm/e1q ; less /dev/shm/e1q ; read -p "save file as text (y/n)?" b ; if [ $b = "y" ] ; then read -p "enter path with filename:" c && touch $(eval echo "$c")  ; mv /dev/shm/e1q $(eval echo "$c") ; fi ; echo DONE
enter url:www.google.com
save file as text (y/n)?y
enter path with filename:~/this
DONE
*(me)*@ubuntu:~$ 
```
0

read -p "enter url:" a ; w3m -dump $a > /dev/shm/e1q ; less /dev/shm/e1q ; read -p "save file as text (y/n)?" b ; if [ $b = "y" ] ; then read -p "enter path with filename:" c && touch $(eval echo "$c") ; mv /dev/shm/e1q $(eval echo "$c") ; fi ; echo DONE

LinuxMan · 2010-07-13 22:36:38 5
Find the package a command belongs to on Gentoo
This is sample output - yours may be different.
0

equery belongs $( which mv )

mrwill · 2011-02-11 22:50:15 3
Find all files over 20MB and print their names and size in human readable format
This is sample output - yours may be different.
0

find / -type f -size +20000k -exec ls -lh {} \; | awk '{printf $9} {for (i=10;i<=NF;i++) {printf " "$i}} {print ": "$5}'

loicb · 2011-03-17 10:26:48 3
Overcome Bash's expansion order

In order to create, let's say, 10 directories with a single process we can use the command: mkdir test{1,2,3,4,5,6,7,8,9,10} something extremely boring to type! Why not use seq? seq -s, 1 10 and use its output inside the curly braces? The obvious solution mkdir test{$(seq -s, 1 10)} is, unfortunately, too naive and doesn't work. The answer is the order of the shell expansions (feature of Bourne Shell, actually), where brace expansion happens before command substitution (according to Bash's manual). The solution is to put another level of substitution, using the powerful and mystic command eval. I found the trick in a similar problem in the post at http://stackoverflow.com/questions/6549037/bash-brace-expansion-in-scripts-not-working-due-to-unwanted-escaping
This is sample output - yours may be different.
0

eval "mkdir test{$(seq -s, 1 10)}"

xakon · 2011-07-23 17:09:01 9
Read/Write output/input from sed to a file

Can't print correctly in the command field. There is a new line before } as follows seq 20 | sed -n '5,6 { w out.txt }' Show Sample Output
This is sample output - yours may be different.
```
$ seq 20 | sed  -n '5,6 { w out.txt 
}'

$ cat out.txt
5
6
```
0

seq 20 | sed '5,6 { w out.txt }' #Can't print correctly. See sample output

totti · 2011-08-29 10:17:47 3
fomat/encode/escape xml
This is sample output - yours may be different.
0

xml fo -e utf-8 file.xml | xml esc

kev · 2011-11-08 07:51:40 3
ll for mac
This is sample output - yours may be different.
0

alias ll='ls -lisaG'

stecrv · 2012-12-29 23:08:16 4
Delete all files in folder without affecting load

While `echo rm * | batch` might seem to work, it might still raise the load of the system since `rm` will be _started_ when the load is low, but run for a long time. My proposed command executes a new `rm` execution once every minute when the load is small. Obviously, load could also be lower using `ionice`, but I still think this is a useful example for sequential batch jobs. Show Sample Output
This is sample output - yours may be different.
```
warning: commands will be executed using /bin/sh
job 40 at Fri Mar  1 16:07:00 2013
warning: commands will be executed using /bin/sh
job 41 at Fri Mar  1 16:07:00 2013
warning: commands will be executed using /bin/sh
job 42 at Fri Mar  1 16:07:00 2013
warning: commands will be executed using /bin/sh
job 43 at Fri Mar  1 16:07:00 2013
```
0

find . -type f -exec echo echo rm {} '|' batch ';'|bash

Ztyx · 2013-03-01 15:14:08 5
Show OSX Login Screen

This keeps the user logged in but shows the login screen. Very useful when connecting remotely to an OSX-Server via VNC
This is sample output - yours may be different.
0

/System/Library/CoreServices/Menu\ Extras/User.menu/Contents/Resources/CGSession -suspend

zagdul · 2013-04-23 14:27:10 7
Space used by files listed by ls -lt

Use awk to sum and print the space used by a group of files. It works well as long as the space used is not bigger than 79094548.80... I found that upper limit when trying to find out what was the total amount of recoverable space from a set of directories: user@servername:/home/user/scripts>for dirName in aleph_bin aleph_sh aleph_work dailycheck INTERFAZ ; do echo "${dirName} = $(cat /tmp/purge_ocfs_dir.*.log | awk '{sum+=$5} END {printf "%4.2f", sum}') "; done aleph_bin = 79094548.80 aleph_sh = 79094548.80 aleph_work = 79094548.80 dailycheck = 79094548.80 INTERFAZ = 79094548.80 In the worst case scenario, the total number might be almost 137G. user@servername:/home/user/scripts>df -h /ocfs/* Filesystem Size Used Avail Use% Mounted on //argalephfsprod/aleph_bin$ 137G 38G 99G 28% /ocfs/aleph_bin //argalephfsprod/aleph_sh$ 137G 38G 99G 28% /ocfs/aleph_sh //argalephfsprod/aleph_work$ 280G 135G 146G 49% /ocfs/aleph_work //argalephfsprod/dailycheck$ 137G 38G 99G 28% /ocfs/dailycheck //argalephfsprod/INTERFAZ/ 137G 38G 99G 28% /ocfs/INTERFAZ Any suggestion about how to get the correct amount of space for total over 80 Mbytes? Show Sample Output
This is sample output - yours may be different.
```
user@servername:/home/user/scripts>ls -lt | awk '{sum+=$5} END {print sum}'
2065293
```
0

ls -lt | awk '{sum+=$5} END {print sum}'

martinmorono · 2013-07-03 20:12:54 7
Add members of one group to another
This is sample output - yours may be different.
0

dsquery group -samid "group_name" | dsmod group "cn=group_name",dc=example,dc=com" -addmbr

shawn_abdushakur · 2014-03-06 19:19:04 8
BOFH Excuse using curl

Sure, it's dirty, but it's quick, it only displays the excuse, and it works. Show Sample Output
This is sample output - yours may be different.
```
Rhythmic variations in the voltage reaching the power supply.
```
0

curl -s http://pages.cs.wisc.edu/~ballard/bofh/bofhserver.pl |grep 'is:' |awk 'BEGIN { FS=">"; } { print $10; }'

toj · 2014-10-10 21:17:33 7

List all font names installed in the system. Useful for TeX. Show Sample Output

fc-list | cut -d':' -f2 | sort -u

smarx · 2015-12-29 12:23:11 11

docker stats --no-stream $( docker ps -q ) | sed -e "$( docker ps --format "{{.ID}} {{.Names}}" | sed -e "s/$.*$ $.*$/s\/\1\/\2\t\/g;/" )"

gtron · 2016-04-14 15:20:13 12

Parsing URL
This is sample output - yours may be different.
0

perl -MURI::Split=uri_split,uri_join -nle '($s,$a,$p,$q,$f)=uri_split($_);print "$s\t$a\t$p\t$q\t$f"'

akanehara · 2017-02-10 06:05:37 20
Execute md5sum and sha in the same files in a single command.

Stat -c %n #list files. A find command is also useful Tee #use stdout, but reseend to next comand. Can be other Tee ad infinitum xargs #use de name of files to execute md5 and sha diggest.
This is sample output - yours may be different.
0

stat -c %n * |tee >(xargs md5sum >estedir.md5) >(xargs sha512sum >estedir.sha)

Wallebot · 2017-02-27 18:43:28 15
ssh key generate

generates two file id_rsa (private) and id_rsa.pub
This is sample output - yours may be different.
0

ssh-keygen -t rsa -b 4096 -C "your_email@example.com"

aysadk · 2017-03-24 23:37:01 18
check web server port 80 response header

check web server port 80 response header Show Sample Output
This is sample output - yours may be different.
```
HTTP/1.1 200 OK
Server: Apache 2.4.1
Date: Wed, 17 Apr 2019 17:56:50 GMT
Content-Type: text/html
Content-Length: 307
Last-Modified: Sat, 14 Jan 2017 22:01:22 GMT
Connection: close
ETag: "587a9fb2-133"
X-Frame-Options: SAMEORIGIN
Accept-Ranges: bytes
```
0

(echo -e 'GET / HTTP/1.0\r\n\r\n';) | ncat <IPaddress> 80

aysadk · 2019-04-17 18:09:28 34
Update the working tree to the latest git commit
This is sample output - yours may be different.
0

git log -g --pretty=oneline | grep '}: commit' | awk '{print $1}' | head -1 | xargs git checkout -f

jimthunderbird · 2010-03-09 16:56:39 3
fix nvidia-settings display error

When nvidia-settings gets itself into a funk and displays the error "Unable to load X Server Display Configuration page", then use this script to make it reset itself. reference: http://ubuntuforums.org/archive/index.php/t-1047029.html Show Sample Output
This is sample output - yours may be different.
```
Attribute 'AssociatedDisplays' (legerdemain:0.0) assigned value 65536.
```
0

nvidia-settings -a AssociatedDisplays=0x00010000

sharkyo · 2011-02-11 22:56:37 69
Which files/dirs waste my disk space
This is sample output - yours may be different.
0

du -h / | grep -w "[0-9]*G"

pashutinsky · 2011-07-23 19:02:11 3
‹ First < 407 408 409 410 411 > Last ›

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list files recursively by size

Convert embedded spaces in filenames to "_" (underscore)

This command converts filenames with embedded spaces in the current directory replacing spaces with the underscore ("_") character.

Regenerate the /etc/mtab file

Colorized JSON pretty printing

Uses pygmentize and python to create indented and colorized JSON output

Resize a Terminal Window

Replace 70 with the desired height. Replace 180 with the desired width. I put it in my bashrc, because by default my terminal is too small.

Regenerate the /etc/mtab file

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

Moving large number of files

if you want to move with command mv large list of files than you would get following error /bin/mv: Argument list too long alternavite with exec: find /source/directory -mindepth 1 -maxdepth 1 -name '*' -exec mv {} /target/directory \;

easily strace all your apache *child* processes

Like the original version except it does not include the parent apache process or the grep process and adds "sudo" so it can be run by user.

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

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