4 ms·

sudo !! runs the previous line as root, in case you forgot to type sudo

jrockway 16y ago
More like "sudo !!" prepends sudo to the last history entry and executes the result. It may not run as root, depending on the complexity of the shell handiwork you did, and depending on /etc/sudoers. I really, really, really hope that the author doesn't think "sudo !!" is some special kind of magic, and that he knows "echo !!" works the same way. Also, there are keyboards with a "Home" key? Most people just press C-a.
- joevandyk 16y ago
  I'd hope that most people just hit "<esc> I sudo !!<CR>".
  - chopsueyar 16y ago
    You said Esc-0, first.
- chopsueyar 16y ago
  Yeah, I first tried... grep ".jpg" ^C ls | !! ...that worked too. Cool command to learn. Thanks for the clarification, though. Original article was lacking.
- hardik988 16y ago
  Hi, I'm the author (admittedly still quite new to Unix). I did play around with the !! and realized it does a lot more. Thanks for clarifying though! Edit: Typos
  - humblest_ever 16y ago
    It's very powerful. There's more than just the !! for history, also. Check out http://www.catonmat.net/blog/the-definitive-guide-to-bash-command-line-history/ http://www.catonmat.net/blog/the-definitive-guide-to-bash-co... .
- xenophanes 16y ago
  Do you know where I can find a list of hotkeys along the lines of C-a? I personally created my own hotkey (shift left arrow) but learning standard ones would probably be good.
  - jrockway 16y ago
    If you use bash, read the "Command Line Editing" section of "info readline".
    - telemachos 16y ago
      You can also tweak the behavior of readline (for Bash and other applications) and custom make your own key combinations by editing your ~/.inputrc file. A random example from mine: # Insert double quotes & set cursor between them "\C-x\"": "\"\"\eb" # # Insert single quotes & set cursor between them "\C-x'": "''\eb" See also the Bash manual: http://www.gnu.org/software/bash/manual/bashref.html#Command-Line-Editing http://www.gnu.org/software/bash/manual/bashref.html#Command...
  - pyre 16y ago
    Most shells default to emacs keybindings: C-a beginning of line C-k kill text from cursor to end of line C-e end of line M-b move cursor backwards by a word M-f move cursor forwards by a word C-w delete backwards by a word C-h backspace (great when real backspace doesn't work) C-r reverse search through command history (C-w works in Vim(insert mode) and Emacs, but kills me when I try to type it in a browser window to delete a word... Good-bye window and/or tab) In zsh I actually have M-w bound to the normal backspace-by-a-word and C-w bound to the vim version which will do things like count '/' as a word separator so that I can easily backspace through sections of a path rather than be required to delete the whole thing (or nothing).
    - xenophanes 16y ago
      Hmm, FYI most of those work in the safari reply box. I think Apple put them for all Cocoa text fields not just terminal :-)

More like "sudo !!" prepends sudo to the last history entry and executes the result. It may not run as root, depending on the complexity of the shell handiwork you did, and depending on /etc/sudoers. I really, really, really hope that the author doesn't think "sudo !!" is some special kind of magic, and that he knows "echo !!" works the same way. Also, there are keyboards with a "Home" key? Most people just press C-a.

joevandyk 16y ago
I'd hope that most people just hit "<esc> I sudo !!<CR>".
- chopsueyar 16y ago
  You said Esc-0, first.
chopsueyar 16y ago
Yeah, I first tried... grep ".jpg" ^C ls | !! ...that worked too. Cool command to learn. Thanks for the clarification, though. Original article was lacking.
hardik988 16y ago
Hi, I'm the author (admittedly still quite new to Unix). I did play around with the !! and realized it does a lot more. Thanks for clarifying though! Edit: Typos
- humblest_ever 16y ago
  It's very powerful. There's more than just the !! for history, also. Check out http://www.catonmat.net/blog/the-definitive-guide-to-bash-command-line-history/ http://www.catonmat.net/blog/the-definitive-guide-to-bash-co... .
xenophanes 16y ago
Do you know where I can find a list of hotkeys along the lines of C-a? I personally created my own hotkey (shift left arrow) but learning standard ones would probably be good.
- jrockway 16y ago
  If you use bash, read the "Command Line Editing" section of "info readline".
  - telemachos 16y ago
    You can also tweak the behavior of readline (for Bash and other applications) and custom make your own key combinations by editing your ~/.inputrc file. A random example from mine: # Insert double quotes & set cursor between them "\C-x\"": "\"\"\eb" # # Insert single quotes & set cursor between them "\C-x'": "''\eb" See also the Bash manual: http://www.gnu.org/software/bash/manual/bashref.html#Command-Line-Editing http://www.gnu.org/software/bash/manual/bashref.html#Command...
- pyre 16y ago
  Most shells default to emacs keybindings: C-a beginning of line C-k kill text from cursor to end of line C-e end of line M-b move cursor backwards by a word M-f move cursor forwards by a word C-w delete backwards by a word C-h backspace (great when real backspace doesn't work) C-r reverse search through command history (C-w works in Vim(insert mode) and Emacs, but kills me when I try to type it in a browser window to delete a word... Good-bye window and/or tab) In zsh I actually have M-w bound to the normal backspace-by-a-word and C-w bound to the vim version which will do things like count '/' as a word separator so that I can easily backspace through sections of a path rather than be required to delete the whole thing (or nothing).
  - xenophanes 16y ago
    Hmm, FYI most of those work in the safari reply box. I think Apple put them for all Cocoa text fields not just terminal :-)