There are still some very useful tips for using Linux in 2021. Just like this.
Getting the size on the disk of a folder. The du -ack -h | tail -n 1 command will do this.
┌──[jason@192.168.1.3]─[~/Music] └──╼ ╼ $ du -ack -h | tail -n 1 8.2G total |
This shows how much disk space the ~/Music folder takes up.
This interesting command will put line numbers on text, output, but only if it is not a blank line.
┌──[jason@192.168.1.3]─[~/Desktop] └──╼ ╼ $ sed '/./=' root.desktop | sed '/./N; s/\n/ /' 1 [Desktop Entry] 2 Type=Link 3 Name=Root 4 Name[ca]=Arrel 5 Name[de]=Basisordner 6 Name[eo]=Radiko 7 Name[fi]=Juuri 8 Name[fr]=Dossier racine 9 Name[gl]=Raíz 10 Name[ja]=Root 11 Name[ms]=Root 12 Name[pl]=Katalog główny 13 Name[ru]=Корневой каталог 14 Name[sr]=Корен 15 Name[tr]=Kök Dizin 16 Comment=The Root Filesystem base 17 Comment[ca]=Directori arrel fitxers 18 Comment[de]=Die Basis des Wurzeldateisystems 19 Comment[eo]=La radika dosiersistemo 20 Comment[es]=El sistema de archivos root 21 Comment[fi]=Tiedostojärjestelmäpuun juuri 22 Comment[fr]=Le système de fichiers à la base 23 Comment[gl]=O sistema de ficheiros root |
Reverse every line in a text file. This could be useful I guess…
┌──[jason@192.168.1.3]─[~/Desktop] └──╼ ╼ $ sed '/\n/!G;s/\(.\)\(.*\n\)/&\2\1/;//D;s/.//' tmp.desktop ]yrtnE potkseD[ kniL=epyT pmeT=emaN .pmeT=]ac[emaN netaD eräropmeT=]ed[emaN japmetmuD=]oe[emaN tesiakiailäV=]if[emaN seriaropmeT=]rf[emaN siaropmeT=]lg[emaN 温気=]aj[emaN aratnemeS=]sm[emaN arutarepmeT=]lp[emaN soiráropmeT=]tp[emaN голатак йыннемерВ=]ur[emaN oнемервирП=]rs[emaN pöÇ=]rt[emaN selif yraropmeT=tnemmoC slaropmet srextiF=]ac[tnemmoC neietaD eräropmeT=]ed[tnemmoC joreisod japmetmuD=]oe[tnemmoC |
This example will print the file sizes in a directory listing in bytes and add commas to the output.
┌──[jason@192.168.1.3]─[~/Desktop] └──╼ ╼ $ stat --format="%s %n" * | sed -e :a -e 's/\(.*[0-9]\)\([0-9]\{3\}\)/\1,\2/;ta' | head -n 25 1,314,524 100_0,273.jpg 1,303,195 100_0,283.jpg 1,307,745 100_0,284.jpg 1,320,254 100_0,330.jpg 1,282,582 100_0,357.jpg 133,110 1,381,036,356,449-960x540.jpg 54,602 1,381,036,356,449-960x540.webp 1,703,445 1,403,880,531,199.jpg 433,715 1,516,736,709,532.jpg 259,287 1,615,955,828,431.webm 20,791 account_activities_201,308.pdf 80,075 anti.png 549,997 Australian_Raven_by_lozzalee.jpg |
This is another example, of the same trick.
┌──[jason@192.168.1.3]─[~/Desktop] └──╼ ╼ $ ls -s --block-size=1 | sed -e :a -e 's/\(.*[0-9]\)\([0-9]\{3\}\)/\1,\2/;ta' | head -n -1 total 71,581,696 1,314,816 100_0,273.jpg 1,306,624 100_0,283.jpg 1,310,720 100_0,284.jpg 1,323,008 100_0,330.jpg 1,286,144 100_0,357.jpg 135,168 1,381,036,356,449-960x540.jpg 57,344 1,381,036,356,449-960x540.webp 1,703,936 1,403,880,531,199.jpg 438,272 1,516,736,709,532.jpg 262,144 1,615,955,828,431.webm 24,576 account_activities_201,308.pdf 81,920 anti.png 552,960 Australian_Raven_by_lozzalee.jpg 90,112 back.png 32,768 backupsettings.conf 4,096 bandcamp-dl-master 4,096 Boomsrc |
Remove the last line of each paragraph in a text file.
┌──[jason@192.168.1.3]─[~/Documents/bdoom] └──╼ ╼ $ sed -n '/^$/{p;h;};/./{x;/./p;}' FAQ.txt Compatibility/Demos: Q: I'm trying to play a demo, but it gets out of sync, what's wrong? A: Read README.compatibility if you don't have already. A: If everything failes report us which demo got out of sync and where we can get it. Don't send it to us directly. Now hope the best that it gets fixed. Linux: Q: I get wrong colors when using SVGALib, can't you do your job right? A: The SDL Library is broken, bug the SDL people about it. OpenGL: Q: I'm trying to get PrBoom with OpenGL working on my 3dfx Voodoo card on Windows, but it doesn't work or is very slow. A: Use Mesa3D (http://www.mesa3d.org) with 3dfx support. Q: The sky looks wrong in OpenGL, WTF? A: It seems like you are using Mesa3D. Try a newer version and if it's still not fixed bug them about it. A: Are you using Windows? Try using another glu32.dll. |
Print the last 10 lines of a file (emulates “tail”).
┌──[jason@192.168.1.3]─[~/Documents/bdoom] └──╼ ╼ $ sed -e :a -e '$q;N;11,$D;ba' FAQ.txt A: Use Mesa3D (http://www.mesa3d.org) with 3dfx support. Q: The sky looks wrong in OpenGL, WTF? A: It seems like you are using Mesa3D. Try a newer version and if it's still not fixed bug them about it. A: Are you using Windows? Try using another glu32.dll. Q: I get a compile error saying PFNGLCOLORTABLEEXTPROC isn't defined A: Get a newer version of your OpenGL headers/drivers. This problem occured on nvidia cards. If you still can't get it working, the please tell us. |