Databases, Systems & Networks

Open directory in finder

open .

Pbcopy and pbpaste

grep 'searching for' hugeFile.txt | pbcopy
pbpaste | sed 's/ / /g'

mdfind command is the spotlight search from command line

say "Hello there"

The say command invokes the system text-to-speech capabilities.

cd -

Will restore the previous directory you were in. Very handy if you accidentally type cd and flip to home.

And some usefull aliases

alias ..="cd .." alias ...="cd .. ; cd .."
alias ls="ls -G" # list alias la="ls -Ga" # list all, includes dot files alias ll="ls -Gl" # long list, excludes dot files alias lla="ls -Gla" # long list all, includes dot files
alias stfu="osascript -e 'set volume output muted true'" alias pumpit="osascript -e 'set volume 10'"
alias ips="ifconfig -a | perl -nle'/(d .d .d .d )/ && print $1'" alias myip="dig  short myip.opendns.com @resolver1.opendns.com"

Bash Keyboard Shortcuts

Moving the cursor:

  Ctrl   a   Go to the beginning of the line (Home)
  Ctrl   e   Go to the End of the line (End)
  Hold the Option key  and click on the current line = Jump Backwards

  Ctrl   p   Previous command (Up arrow)
  Ctrl   n   Next command (Down arrow)
  Hold the Option key  and click on a previous line = Jump upwards

  Ctrl   f   Forward one character
  Ctrl   b   Backward one character
   Alt   b   Back (left) one word      or use Option Right-Arrow
   Alt   f   Forward (right) one word  or use Option Left-Arrow

  Ctrl   xx  Toggle between the start of line and current cursor position

Editing:

 Ctrl   L   Clear the Screen, similar to the clear command

  Alt   Del Delete the Word before the cursor.
  Alt   d   Delete the Word after the cursor.
 Ctrl   d   Delete character under the cursor
 Ctrl   h   Delete character before the cursor (backspace)

 Ctrl   w   Cut the Word before the cursor to the clipboard.
 Ctrl   k   Cut the Line after the cursor to the clipboard.
 Ctrl   u   Cut/delete the Line before the cursor position.

  Alt   t   Swap current word with previous
 Ctrl   t   Swap the last two characters before the cursor (typo).
 Esc    t   Swap the last two words before the cursor.

 ctrl   y   Paste the last thing to be cut (yank)
  Alt   u   UPPER capitalize every character from the cursor to the end of the current word.
  Alt   l   Lower the case of every character from the cursor to the end of the current word.
  Alt   c   Capitalize the character under the cursor and move to the end of the word.
  Alt   r   Cancel the changes and put back the line as it was in the history (revert).
 ctrl   _   Undo
 
  TAB       Tab completion for file/directory names

For example, to move to a directory ‘sample1’; Type cd sam ; then press TAB and ENTER.
type just enough characters to uniquely identify the directory you wish to open.

Special keys: Tab, Backspace, Enter, Esc

Text Terminals send characters (bytes), not key strokes.
Special keys such as Tab, Backspace, Enter and Esc are encoded as control characters.
Control characters are not printable, they display in the terminal as ^ and are intended to have an effect on applications.

Ctrl I = Tab
Ctrl J = Newline
Ctrl M = Enter
Ctrl [ = Escape

Many terminals will also send control characters for keys in the digit row:

Ctrl 2 → ^@
Ctrl 3 → ^[ Escape
Ctrl 4 → ^
Ctrl 5 → ^]
Ctrl 6 → ^^
Ctrl 7 → ^_ Undo
Ctrl 8 → ^? Backward-delete-char

Ctrl v tells the terminal to not interpret the following character, so Ctrl v Ctrl-I will display a tab character,
similarly Ctrl v ENTER will display the escape sequence for the Enter key: ^M

History:

  Ctrl   r   Recall the last command including the specified character(s)
             searches the command history as you type.
             Equivalent to : vim ~/.bash_history. 
  Ctrl   p   Previous command in history (i.e. walk back through the command history)
  Ctrl   n   Next command in history (i.e. walk forward through the command history)
   Alt   .   Use the last word of the previous command
  Ctrl   s   Go back to the next most recent command.
            (beware to not execute it from a terminal because this will also launch its XOFF).
  Ctrl   o   Execute the command found via Ctrl r or Ctrl s
  Ctrl   g   Escape from history searching mode

Process control:

 Ctrl   C   Interrupt/Kill whatever you are running (SIGINT)
 Ctrl   l   Clear the screen
 Ctrl   s   Stop output to the screen (for long running verbose commands)
 Ctrl   q   Allow output to the screen (if previously stopped using command above)
 Ctrl   D   Send an EOF marker, unless disabled by an option, this will close the current shell (EXIT)
 Ctrl   Z   Send the signal SIGTSTP to the current task, which suspends it.
            To return to it later enter fg 'process name' (foreground).

To use the Alt Key Shortcuts in OS X – Open Terminal Preferences | Settings Tab | Keyboard | Tick “Use option as meta key”

Emacs mode vs Vi Mode

All the above assume that bash is running in the default Emacs setting, if you prefer this can be switched to Vi shortcuts instead.

Set Vi Mode in bash:

$ set -o vi

Set Emacs Mode in bash:

$ set -o emacs

Source: @coderwall and ss64.com