A collection of links to useful cheat sheets.
Only what's properly printable can get in. It should also be small enough to fit on a few pages.
Pleae contribute any you remember you've seen and liked. It would be wonderful if we can get these to be something more commonly made.
https://www.alienvault.com/blog-content/GoogleHackingCheatSheet.pdf (nicely put together!)
http://bhami.com/unix-rosetta.pdf (printable on big printers)
http://www.tablespace.net/quicksheet/aix-quicksheet.pdf
http://www.cheat-sheets.org/saved-copy/linux_quickref.pdf https://www.loggly.com/wp-content/uploads/2015/05/Linux-Cheat-Sheet-Sponsored-By-Loggly.pdf (Linux and its GNUisms)
http://www.oracle.com/technetwork/solaris-11-cheat-sheet-1556378.pdf (printable, great)
https://cs.indstate.edu/~sbaker/faq/QuickRefCard.pdf
https://www.sans.org/security-resources/sec560/windows_command_line_sheet_v1.pdf (printable, old)
http://www.roesen.org/files/cp_cli_ref_card.pdf
https://forums.juniper.net/jnet/attachments/jnet/ConfigLib/147/1/Juniper-SRX-CheatSheet.pdf (printable, old) http://netfixpro.com/wp-content/uploads/2016/09/Juniper-Commands-Cheat-Sheet-1.pdf (printable, looks good)
https://mystajones.files.wordpress.com/2016/06/cisco-ios-quick-reference-cheat-sheet-2-1.pdf (printable)
https://havel.mojeservery.cz/wp-content/uploads/2015/10/routeros-cheat-sheet-v1.1.pdf (printable)
http://eval.veritas.com/downloads/van/vm_quickref.pdf (printable)
http://hamwaves.com/zfs/en/zfs.a4.pdf (good manual, but not 2 pages)
https://gist.github.com/jctosta/af918e1618682638aa82 (Markdown but small enough to print) https://catonmat.net/ftp/screen.cheat.sheet.pdf (PDF, a bit ugly) http://www.guckes.net/Screen/doc/GNU_Screen_Quick_Reference_Card.pdf (perfect!)
http://atkinsam.com/documents/tmux.pdf (wow, so tmux is more complex than screen? wtf people)
https://en.opensuse.org/images/1/17/Zypper-cheat-sheet-1.pdf (printable, front) https://en.opensuse.org/images/3/30/Zypper-cheat-sheet-2.pdf (printable, back)
http://www.arduino.org/learning/getting-started/download/21_924abaed4958b5b40713907d1099b82c (printable)
http://www.postgresonline.com/downloads/special_feature/postgresql90_cheatsheet_A4.pdf
http://www.dusun-think.net/dosya/czyayin/mysqlcheatsheet.pdf https://havel.mojeservery.cz/wp-content/uploads/2015/10/mysql-ref-card.pdf (better looks)
https://www.docker.com/sites/default/files/Docker_CheatSheet_08.09.2016_0.pdf (printable)
https://sematext.com/wp-content/uploads/2017/04/kubernetes-cheatsheet.pdf (printable)
https://www.cheatography.com/davbfr/cheat-sheets/vagrant-cheat-sheet/
WHY is there none for VBoxManage?
http://public.diversetips.se/XenServer%206.0%20XE-Command%20Reference%20(1.1).pdf (WOW!) http://360is.blogspot.de/2009/03/xenserver-administration-poster.html (~2009, asking for email, good intro anyway)
https://www.adldata.org/wp-content/uploads/2015/07/VMware-vSphere-Performance-Resolution-Cheat-Sheet.pdf (performance debugging) http://www.4d-dc.com/sites/default/files/4D_CHEAT_SHEET%20VM_WARE%201%206.pdf (only Ports and Logs)
https://vmware.github.io/photon-controller/assets/files/command-line-cheat-sheet.pdf
https://azeria-labs.com/assembly-basics-cheatsheet/
http://blog.nanard.org/post/2013/05/23/CFEngine-3-%3A%3A-PCRE-cheatsheet (PCRE Cheatsheet)
..
..
(I remember one for knife)
..
https://www.cheatography.com/dlicudi/cheat-sheets/guidelines-for-writing-checks-for-check-mk/
http://www.cheat-sheets.org/saved-copy/2675288-Veritas-Cluster-Cheat-Sheet.pdf (printable) http://eval.veritas.com/downloads/van/vcs_quickref.pdf (printable, better)
https://services.github.com/on-demand/downloads/github-git-cheat-sheet.pdf (printable) https://www.atlassian.com/dms/wac/images/landing/git/atlassian_git_cheatsheet.pdf (printable, better)
https://www.mercurial-scm.org/wiki/QuickReferenceCardsAndCheatSheets?action=AttachFile&do=view&target=Mercurial-Cheatsheet-Adrian-v1.0.pdf (once you know it, this is beneficial) http://www.cheatography.com/codeshane/cheat-sheets/mercurial-hg/pdf/ (printable)
http://orgmode.org/orgcard.pdf (printable, org mode only?)
https://www.ibm.com/developerworks/community/files/form/anonymous/api/library/0e088c99-9f24-4c5c-a79a-a65ab8323565/document/ea62f503-ceaa-403f-8142-26a946e0723a/media (printable, good explanations I've not seen before)
http://www.glump.net/files/2012/08/vi-vim-cheat-sheet-and-tutorial.pdf (printable, information density: flight sim users)
https://learncodethehardway.org/unix/bash_cheat_sheet.pdf http://www.asfa.k12.al.us/ourpages/auto/2016/8/10/55689107/reference_bash-cheat.pdf (not too specific) https://www.cheatography.com/citguy/cheat-sheets/bash-shortcuts/ (emacs mode movement only) http://www.catonmat.net/download/bash-vi-editing-mode-cheat-sheet.pdf (vi mode movement only, highly recommended if you want to actually USE your shell)
http://st23.org/misc/sysadmin/downloads/reference.card-ksh.programming.pdf (printable, 1994)
https://download.microsoft.com/download/2/1/2/2122F0B9-0EE6-4E6D-BFD6-F9DCD27C07F9/WS12_QuickRef_Download_Files/PowerShell_ISE_v3.pdf https://static1.squarespace.com/static/552092d5e4b0661088167e5c/t/5760096ecf80a129e0b17634/1465911664070/Windows+PowerShell+Logging+Cheat+Sheet+ver+June+2016+v2.pdf (about logging)
Win: https://code.visualstudio.com/shortcuts/keyboard-shortcuts-windows.pdf Mac: https://code.visualstudio.com/shortcuts/keyboard-shortcuts-macos.pdf Linux: https://code.visualstudio.com/shortcuts/keyboard-shortcuts-linux.pdf
http://packetlife.net/media/library/16/Markdown.pdf (printable) https://www.rstudio.com/wp-content/uploads/2015/02/rmarkdown-cheatsheet.pdf (printable, for R users)
http://www.digilife.be/quickreferences/QRC/Doxygen%20Quick%20Reference.pdf (printable, ftw)
http://pentestmonkey.net/cheat-sheet/shells/reverse-shell-cheat-sheet (not pdf, but useable)
... nothing yet
... didnt find anything good
(For the record, anything that is not purely PDF should be down here)
https://www.cyberciti.biz/howto/question/linux/apt-get-cheat-sheet.php
https://devhints.io/bash.html (really nice)
http://www.cyberfella.co.uk/2012/08/28/emc-networker/
http://lzone.de/cheat-sheet/OpenNebula
https://sabaini.at/pages/ceph-cheatsheet.html
http://www.datadisk.co.uk/html_docs/sun/sun_zfs_cs.htm
https://workaround.org/bacula-cheatsheet/
https://www.cambus.net/freebsd-cheatsheet/ https://gist.github.com/steakknife/77619edfa67c501c8aa0
http://linux-iscsi.org/wiki/ISCSI#Cheat_sheet
http://www.ducea.com/2009/03/08/mdadm-cheat-sheet/
https://github.com/bertvv/cheat-sheets/blob/master/print/VyOS.pdf
http://blogofsysadmins.com/xenserver-commands-cheat-sheet (text, not pdf :)
http://richgoldstein.net/KB/esx_cheatsheet.html https://ervikrant06.wordpress.com/2014/07/16/esx-5-5-cheat-sheet-part-1/
http://www.pica8.com/document/v2.3/pdf/ovs-commands-reference.pdf (pica8 is only good docs, pdf, but not a cheat sheet)
There is a well-maintained cheatsheet, it just would need someone who gives it proper formatting. (The author explains the nice markdown pandoc interface but it seems this is also the exact reason why this doesn't have a nice format) https://github.com/Jeeppler/qubes-cheatsheet/raw/master/qubes-cheatsheet.pdf
https://github.com/neilhwatson/nustuff/blob/master/perl/cheatsheet.pod