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18/05/2016

17/02/2016

Ctrl + c
Kill the current process.
Ctrl + z
Send the current process to background. This is useful if you have a program running, and you need the terminal for awhile but don't want to exit the program completely. Then just send it to background with Ctrl+z, do whatever you want, and type the command fg to get the process back
Ctrl + d
Log out from the current terminal. If you use this in a terminal emulator under X, this usually shuts down the terminal emulator after logging you out.

17/02/2016

1. Vim Line Navigation
Following are the four navigation that can be done line by line.
k – navigate upwards
j – navigate downwards
l – navigate right side
h – navigate left side
By using the repeat factor in VIM we can do this operation for N times. For example, when you want to
go down by 10 lines, then type “10j”.
Within a line if you want to navigate to different position, you have 4 other options.
0 – go to the starting of the current line.
^ – go to the first non blank character of the line.
$ – go to the end of the current line.
g_ – go to the last non blank character of the line.
2. Vim Screen Navigation
Following are the three navigation which can be done in relation to text shown in the screen.
H – Go to the first line of current screen.
M – Go to the middle line of current screen.
L – Go to the last line of current screen.
ctrl+f – Jump forward one full screen.
ctrl+b – Jump backwards one full screen
ctrl+d – Jump forward (down) a half screen
ctrl+u – Jump back (up) one half screen
3. Vim Special Navigation
You may want to do some special navigation inside a file, which are:
N% – Go to the Nth percentage line of the file.
NG – Go to the Nth line of the file.
G – Go to the end of the file.
`” – Go to the position where you were in NORMAL MODE while last closing the file.
`^ – Go to the position where you were in INSERT MODE while last closing the file.
g – Go to the beginning of the file.

17/02/2016

vim command examples
Go to the 143rd line of file
$ vim +143 filename.txt
Go to the first match of the specified
$ vim +/search-term filename.txt
Open the file in read only mode.
$ vim -R /etc/passwd

17/02/2016

shutdown command examples
Shutdown the system and turn the power off immediately.
# shutdown -h now
Shutdown the system after 10 minutes.
# shutdown -h +10
Reboot the system using shutdown command.
# shutdown -r now
Force the filesystem check during reboot.
# shutdown -Fr now

17/02/2016

rm command examples
Get confirmation before removing the file.
$ rm -i filename.txt
It is very useful while giving shell metacharacters in the file name argument.
Print the filename and get confirmation before removing the file.
$ rm -i file*
Following example recursively removes all files and directories under the example directory. This also removes the example directory itself.
$ rm -r example