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Linux

Create zip archive

add -e flag to encrypt

zip -r /tmp/ziparchive.zip ~/Documents/

Create bootable USB

sudo dd bs=4M if=~/Downloads/linux-2016.09.03.iso of=/dev/sdb && sync

Find examples

    
    # find files or directories:
    find /usr -name gcc
    # find files
    find /usr -type f -name test1
    # find directories
    find /usr -type d -name gcc
    # find by modified date (3 days)
    find / -ctime 3
    # find files (case insensitive)
    find / -iname gcc 
    # find files with size
    find /etc -size +10M
    # find and remove found files using -exec
    find -name "*.swp" -ok rm {} ’;’

GPG/SSH setup - encrypt/decrypt files

General instructions for creating an idendity and encrypt/decrypt files with it.

Check for existing keys with gpg --list-keys
Create new with gpg --full-generate-key
if timeout: create ~/.gnupg/gpg.conf and add line: pinentry-mode loopback
you can backup the whole .gnupg dir and transfer it (if using same versions). Otherwise use --export
decrypt: gpg --output outputfile.txt --decrypt inputfile.gpg
encrypt: gpg -r -e
also editing the gpg-agent.conf you can set how many days the password is kept in cache and other options, like which pinentry program to use.

SSH keys

The SSH keys are used for secure connections using the SSH protocol. Instructions for creating can be found on github help pages

They can be copied to another computer using the scp command from one ~/.ssh folder to another but afterwards you still need to create an identity with ssh-add (although it's not considered a good practice)

Image Magick

Resize images to another folder

mogrify -path "new" -resize 50% -format jpg *.jpg

Crop images to another folder

mogrify -path "new" -crop 320x320+0+0 -format jpg *.jpg

HD monitor resolution on Linux

copy this to /etc/X11/xorg.conf.d/10-monitor.conf

Section "Monitor"
    Identifier "VGA-1"
    Modeline "1920x1080R"  138.50  1920 1968 2000 2080  1080 1083 1088 1111 +hsync -vsync
    Option "PreferredMode" "1920x1080R"
EndSection

Correct time when dual booting Windows

Linux part commands

	   sudo ntpdate pool.ntp.org
	   sudo hwclock --systohc --utc
	   sudo timedatectl set-local-rtc 1

Windows part Regedit .reg file

	       Windows Registry Editor Version 5.00
	       [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation]
	       "RealTimeIsUniversal"=dword:00000001