Tuesday, October 1, 2013

Important keyboard shortcuts in Linux Shell(BASH)

Following keyboard shortcuts are very useful while working in Bash

  1. Ctrl +u Cut the current line
  2. Ctrl+y Paste the line which has been earlier with Ctrl +u
  3. Ctrl +l clear the screen
  4. Ctrl+G get the new line and abandon the current line
  5. Ctrl+a go to beginning of the line
  6. Ctrl+e go to End of line
  7. Ctrl+k Erase from the cursor to the end of line
  8. Ctrl +r search in the history
  9. Ctrl+w cuts a word backwards
  10. Ctrl+d  Tired of typing 'exit' to close a terminal? Just hit ctrl+d on a blank line and boom!
  11. Ctrl+right - Jump one word to the right.
  12. Ctrl+left - Jump one word to the left.
  13. ALT+DEL Delete word(s) to the left of the cursor
  14. !! Repeat last command 
There are some situation when i want to read the log as well redirect it to some file for later view. 
some_command | tee output.txt 
if you want to redirect both STDERR(2) and STDOUT(1) to the same thing then we can use 2 >&1
some_command >big_blob_of_crap.txt 2>&1
The output of the ‘come_command’ is redirected to a ‘big_blob_of_crap.txt’ and the error channel (that is the ’2′ is redirected to a pointer (?) of the output (‘&1′).
So stderr goes to the stdout and that goes to the file.
some_command &>big_blob_of_crap.txt
If you want to redirect STDERR and STDOUT to a single file and at the same time, you want to view them on the screen then we can use use
some_command |tee big_blob_of_crap.txt 2>&1


4 comments:

Ray said...

I recently discovered the ^R search command. I now use it all the time. Use escape to cancel and enter to execute the command.

Ray said...

Here are some other history commands I use a lot:

!! Repeat last command.
!foo Repeat last command starting with "foo".
!?foo Repeat last command ending with "foo".
!?foo? Repeat last command containing "foo".
^foo^bar Replace "foo" with "bar" in the last command.

Shailesh said...

Thanks Ray. I am updating the doc with your info so that we can find all useful shortcuts in one place.

mahasiswa teladan said...

hi..Im college student, thanks for sharing :)