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Get python major.minor version in shell oneliner

Useful in shell scripts to dynamically detect python version, eg. in library paths etc: /usr/lib/python3.4 Show Sample Output
This is sample output - yours may be different.
```
3.4
```
0

python -c 'import sys; print(str(sys.version_info[0])+"."+str(sys.version_info[1]))'

yukoff · 2017-06-01 05:59:45 18
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 20:52:35 427
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
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Updates your no-ip.org account with curl

Search recursively to find a word or phrase in certain file types, such as C code

ack search recursively by default

function to compute what percentage of X is Y? Where percent/100 = X/Y => percent=100*X/Y

This function make it easy to compute X/Y as a percentage. The name "wpoxiy" is an acronym of "what percentage of X is Y"

Get a facebook likes quantity from CLI

Replace the with your URL, for example http://rublacklist.net/12348/ and it will show likes number

Empty a file

The downside of output redirection is that you need permissions. So something like $ > file won't play nicely w/ sudo. You'd need to do something like $ bash -c '> file' instead, you could go w/ $ sudo truncate -s0 file

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"

Read and write to TCP or UDP sockets with common bash tools

Ever needed to test firewalls but didn't have netcat, telnet or even FTP? Enter /dev/tcp, your new best friend. /dev/tcp/(hostname)/(port) is a bash builtin that bash can use to open connections to TCP and UDP ports. This one-liner opens a connection on a port to a server and lets you read and write to it from the terminal. How it works: First, exec sets up a redirect for /dev/tcp/$server/$port to file descriptor 5. Then, as per some excellent feedback from @flatcap, we launch a redirect from file descriptor 5 to STDOUT and send that to the background (which is what causes the PID to be printed when the commands are run), and then redirect STDIN to file descriptor 5 with the second cat. Finally, when the second cat dies (the connection is closed), we clean up the file descriptor with 'exec 5>&-'. It can be used to test FTP, HTTP, NTP, or can connect to netcat listening on a port (makes for a simple chat client!) Replace /tcp/ with /udp/ to use UDP instead.

burn an ISO image to writable CD

Does life get much easier? Read up about wodim for an understanding of its origins in relation to the older `cdrecord` utility

watch process stack, sampled at 1s intervals

This command repeatedly gets the specified process' stack using pstack (which is an insanely clever and tiny wrapper for gdb) and displays it fullscreen. Since it updates every second, you rapidly get an idea of where your program is stuck or spending time. The 'tac' is used to make the output grow down, which makes it less jumpy. If the output is too big for your screen, you can always leave the 'tac' off to see the inner calls. (Or, better yet--get a bigger screen.) Caveats: Won't work with stripped binaries and probably not well with threads, but you don't want to strip your binaries or use threads anyway.

Remove blank lines from a file using grep and save output to new file

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