Key Bindings

Grep

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 KeyBoard ShortCuts
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: Grep :
grep 'text' /folder/file.log            Regular search (-c adds count, -n adds line no., --color options add color)
grep -i 'text' /folder/file.log         Ignore case
grep -r 'text' /folder/                 search recursively (-h will hide file names)
grep -w 'word' /folder/file.log         search for word only
grep -v 'text' /folder/file.log            Invert search
grep -l 'main' *.c -l option to list file name whose contents mention
egrep -w 'word1|word2' /folder/file.log            search for words only

Nano

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 KeyBoard ShortCuts
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 : Nano :

^A  move to beginning of line
^E  move to end of line
^V  move down a page
^Y  move up a page
^_  move to a specific line 
^_^V moves to the bottom of the file
^_^Y to the top
^C  find out what line the cursor is currently on
^W  search for some text.
^D  delete character currently under the cursor
BackSpace delete character currently in front of the cursor
^K  delete entire line
^\  search for (and replace) a string of characters
^U paste

^O  save contents without exiting (you will be prompted for a file to save to)
^X  exit nano (you will be prompted to save your file if you haven't)
^T  when saving a file, opens a browser that allows you to select a file name from a list of files and directories

Sublime Text

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 KeyBoard ShortCuts
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: Sublime Text :

Command + Shift + V  Paste with indentation
Ctrl + Shift + K Delete line
Command + K K Delete from cursor to end of line
Command + K Backspace Delete from cursor to beginning of line
Command + Shift + D Duplicate line / selection
Command + Shift + Enter Insert line before 
Command + Enter Insert line after 
Command + L Select line
Command + J Join next line end of the current line  
Command + ] Indent line(s)
Command + [ UnIndent line(s)
Command + Shift + L Split selection into lines
Command + D Add next occurence to selection
Ctrl + Command + G  Add all occurences to selection
Ctrl + M Go to closing / opening parenthesis
Ctrl + Shift + M Select contents inside parenthesis
Command + Shift + J Expand selection to indentation
Command + R Goto symbol

Terminal

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 KeyBoard ShortCuts
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: Terminal :
Ctrl + a   Go to the beginning of the line (Home) (Command + Left Arrow)
Ctrl + e   Go to the End of the line (End) (Command + Right Arrow)
Alt  + Right-Arrow  Back (left) one word
Alt  + Leftt-Arrow  Forward (right) one word
Ctrl + xx  Toggle between the start of line and current cursor position
Ctrl + L   Clear the Screen, similar to the clear command
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.
ctrl + y   Paste the last thing to be cut (yank)
Ctrl + r   Recall the last command including the specified character(s)
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)
Ctrl + g   Escape from history searching mode