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31May/100

How to speed up the boot time in Ubuntu by profiling the boot process

There is way to improve the speed of boot process in Ubuntu Linux by profiling your boot. Profiling lets Ubuntu make a list of all the files that are accessed during bootup, it then sorts the files according to how they are stored on your hard-disk. So the next time the system is booted, the files would be read faster.

To profile boot you need to follow these steps:

  • At the grub menu highlight the kernel
  • Press e for edit
  • Choose the line starting with kernel and press e again. Now add the word profile to the end of this line. Hit Enter and then press b to boot

NOTE: The system will boot slower this one time, the next time however you should see an improvement. Also keep in mind that all this is machine-dependent and also depends on the arrangement of files on your hard-disk, so the difference you see might not be huge, or even nil in some cases.

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31May/100

Linux Tips: Keyboard shortcuts and command line tricks

In this article I will show you some keyboard shortcuts and other command line tricks to make entering commands easier and faster. Learning them can make your life a lot easier!

Here are some keyboard shortcuts you can use within terminal:

Alt-r              Undo all changes to the line.
Alt-Ctrl-e        Expand command line.
Alt-p              Non-incremental reverse search of history.
Alt-] x            Moves the cursor forward to the next occurrence of x.
Alt-Ctrl-] x      Moves the cursor backwards to the previous occurrence of x.
Ctrl-a             Move to the start of the line.
Ctrl-e             Move to the end of the line.
Ctrl-u             Delete from the cursor to the beginning of the line.
Ctrl-k             Delete from the cursor to the end of the line.
Ctrl-w            Delete from the cursor to the start of the word.
Ctrl-y             Pastes text from the clipboard.
Ctrl-l              Clear the screen leaving the current line at the top of the screen.
Ctrl-x Ctrl-u    Undo the last changes. Ctrl-_
Ctrl-r              Incremental reverse search of history.
!!                   Execute last command in history
!abc               Execute last command in history beginning with abc
!n                  Execute nth command in history
^abc^xyz       Replace first occurrence of abc with xyz in last command and execute it

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