Linux bash常用命令案例记录

1. scp (if the private key is id_rsa, [-i] can be removed)
   scp -i key -P port localfile user@ip:path

2. back to the beginning of line
   Ctrl + a

3. go to the end of line
   Ctrl + e

4. cut character from current position to the beginning
   Ctrl + u

5. cut character from current position to the end
   Ctrl + k

6. set timezone
   timedatectl set-timezone Asia/Hong_Kong

7. run in background
   nohup command > logfile 2>&1 &

8. use ImageMagick to crop an image file(WIDTHxHEIGHT+X+Y)
   convert input.jpg -crop 100x100+12+34 output.jpg

9. use ImageMagick to concatenate different size image files
   horizontally
   convert +append image1.jpg image2.jpg image3.jpg output.jpg
   vertically
   convert -append image1.jpg image2.jpg image3.jpg output.jpg