Cut a straight line with Knife tool

`Option` +drag

All hotkeys for Adobe Illustrator CS5 (MacOS)

Panel Shortcuts - Actions panel Expand/Collapse entire hierarchy for action set	`Option` +click expansion triangle
Panel Shortcuts - Actions panel Set options for action set	Double-click folder icon
Panel Shortcuts - Actions panel Play a single command	`⌘` +click Play Current Selection button
Panel Shortcuts - Actions panel Begin recording actions without confirmation	`Option` +click New Action button
Panel Shortcuts - Brushes Panel Open Brush Options dialog box	Double-click brush
Panel Shortcuts - Brushes Panel Duplicate brush	Drag brush to New Brush button
Panel Shortcuts - Character and Paragraph panels Increase/decrease the selected value by a small increment	`Up Arrow` / `Down Arrow`
Panel Shortcuts - Character and Paragraph panels Increase/decreases the selected value by a large increment	`Shift` + `Up Arrow` / `Down Arrow`
Panel Shortcuts - Character and Paragraph panels Highlight the font name field in the Character panel	`⌘` + `Option` + `Shift` + `f`
Panel Shortcuts - Color Panel Select the complement for the current color fill/stroke	`⌘` +click color bar
Panel Shortcuts - Color Panel Change the nonactive fill/stroke	`Option` +click color bar
Panel Shortcuts - Color Panel Select the complement for the nonactive fill/stroke	`⌘` + `Option` +click color bar
Panel Shortcuts - Color Panel Select the inverse for the current fill/stroke	`⌘` + `Shift` +click color bar
Panel Shortcuts - Color Panel Select the inverse for the nonactive fill/stroke	`⌘` + `Shift` + `Option` +click color bar
Panel Shortcuts - Color Panel Change the color mode	`Shift` +click color bar
Panel Shortcuts - Color Panel Move color sliders in tandem	`Shift` +drag color slider
Panel Shortcuts - Color Panel Switch between percentage and 0-255 values for RGB	Double-click to right of a numerical field
Panel Shortcuts - Layers Panel Select all objects on the layer	Alt-click layer name
Panel Shortcuts - Layers Panel Show/hide all layers but the selected one	Alt-click eye icon
Panel Shortcuts - Layers Panel Select Outline/Preview view for the selected layer	⌘-click eye icon
Panel Shortcuts - Layers Panel Selects Outline/Preview view for all other layers	`⌘` + Alt-click eye icon
Panel Shortcuts - Layers Panel Lock/unlock all other layers	`Option` +click lock icon
Panel Shortcuts - Layers Panel Expand all sublayers to display entire hierarchy	`Option` +click expansion triangle
Panel Shortcuts - Layers Panel Set options as you create new layer	`Option` +click New Layer button
Panel Shortcuts - Layers Panel Set options as you create new sublayer	`Option` +click New Sublayer button
Panel Shortcuts - Layers Panel Place new sublayer at bottom of layer list	`⌘` + `Option` +click New Sublayer button
Panel Shortcuts - Layers Panel Place layer at top of layer list	`⌘` +click New Layer button
Panel Shortcuts - Layers Panel Place layer below selected layer	`⌘` + `Option` +click New Layer button
Panel Shortcuts - Layers Panel Copy the selection to a layer, sublayer, or group	`Option` +drag selection
Panel Shortcuts - Swatches Panel Select all objects on the layer	`Option` +click layer name
Panel Shortcuts - Swatches Panel Show/hide all layers but the selected one	`Option` +click eye icon
Panel Shortcuts - Swatches Panel Select Outline/Preview view for the selected layer	`⌘` +click eye icon
Panel Shortcuts - Swatches Panel Selects Outline/Preview view for all other layers	`⌘` + `Option` +click eye icon
Panel Shortcuts - Swatches Panel Lock/unlock all other layers	`Option` +click lock icon
Panel Shortcuts - Swatches Panel Expand all sublayers to display entire hierarchy	`Option` +click expansion triangle
Panel Shortcuts - Swatches Panel Set options as you create new layer	`Option` +click New Layer button
Panel Shortcuts - Swatches Panel Set options as you create new sublayer	`Option` +click New Sublayer button
Panel Shortcuts - Swatches Panel Place new sublayer at bottom of layer list	`⌘` + `Option` +click New Sublayer button
Panel Shortcuts - Swatches Panel Place layer at top of layer list	`⌘` +click New Layer button
Panel Shortcuts - Swatches Panel Place layer below selected layer	`⌘` + `Option` +click New Layer button
Panel Shortcuts - Swatches Panel Copy the selection to a layer, sublayer, or group	`Option` +drag selection
Panel Shortcuts - Swatches Panel Create new spot color	`⌘` +click New Swatch button
Panel Shortcuts - Swatches Panel Create new global process color	`⌘` + `Shift` +click New Swatch button
Panel Shortcuts - Swatches Panel Replace swatch with another	`Option` +drag a swatch over another
Panel Shortcuts - Transform Panel Apply a value and keep focus in edit field	`Shift` + `Enter`
Panel Shortcuts - Transform Panel Apply a value and copy object	`Option` + `Enter`
Panel Shortcuts - Transform Panel Apply a value and scale option proportionately for width or height	`⌘` + `Enter`
Panel Shortcuts - Transparency Panel Change mask to grayscale image for editing	`Option` +click on mask thumbnail
Panel Shortcuts - Transparency Panel Disable opacity mask	`Shift` +click on mask thumbnail
Panel Shortcuts - Transparency Panel Re-enable opacity mask	`Shift` +click on disabled mask thumbnail
Panel Shortcuts - Transparency Panel Increase/decrease opacity in 1% increments	Click opacity field + `Up Arrow` / `Down Arrow`
Panel Shortcuts - Transparency Panel Increase/decrease opacity in 10% increments	`Shift` +click opacity field + `Up Arrow` / `Down Arrow`
Function Keys Help	`F1`
Function Keys Cut / Copy / Paste	`F2` / `F3` / `F4`
Function Keys Show/hide Brushes panel	`F5`
Function Keys Show/hide Color panel	`F6`
Function Keys Show/hide Layers panel	`F7`
Function Keys Create new symbol	`F8`
Function Keys Show/hide Info panel	`⌘` + `F8`
Function Keys Show/hide Gradient panel	`⌘` + `F9`
Function Keys Show/hide Stroke panel	`⌘` + `F10`
Function Keys Show/hide Attributes panel	`⌘` + `F11`
Function Keys Revert	`F12`
Function Keys Show/hide Graphic Styles panel	`Shift` + `F5`
Function Keys Show/hide Appearance panel	`Shift` + `F6`
Function Keys Show/hide Align panel	`Shift` + `F7`
Function Keys Show/hide Transform panel	`Shift` + `F8`
Function Keys Show/hide Pathfinder panel	`Shift` + `⌘` + `F9`
Function Keys Show/hide Transparency panel	`Shift` + `⌘` + `F10`
Function Keys Show/hide Symbols panel	`Shift` + `⌘` + `F11`
Function Keys Show/hide perspective grid	`⌘` + `Shift` + `i`
Selecting Tools Artboard tool	`Shift` + `o`
Selecting Tools Selection tool	`v`
Selecting Tools Direct Selection tool	`a`
Selecting Tools Magic Wand tool	`y`
Selecting Tools Lasso tool	`q`
Selecting Tools Pen tool	`p`
Selecting Tools Blob Brush tool	`Shift` + `b`
Selecting Tools Add Anchor Point tool	`+`
Selecting Tools Delete Anchor Point tool	`=`
Selecting Tools C onvert Anchor Point tool	`Shift` + `c`
Selecting Tools Type tool	`t`
Selecting Tools Line Segment tool	`\`
Selecting Tools Rectangle tool	`m`
Selecting Tools Ellipse tool	`l`
Selecting Tools Paintbrush tool	`b`
Selecting Tools Pencil tool	`n`
Selecting Tools Rotate tool	`r`
Selecting Tools Reflect tool	`o`
Selecting Tools Scale tool	`s`
Selecting Tools Warp tool	`Shift` + `r`
Selecting Tools Width tool	`Shift` + `w`
Selecting Tools Free Transform tool	`e`
Selecting Tools Shape Builder tool	`Shift` + `m`
Selecting Tools Perspective Grid tool	`Shift` + `p`
Selecting Tools Perspective Selection tool	`Shift` + `v`
Selecting Tools Symbol Sprayer tool	`Shift` + `s`
Selecting Tools Column Graph tool	`j`
Selecting Tools Mesh tool	`u`
Selecting Tools Gradient tool	`g`
Selecting Tools Eyedropper tool	`i`
Selecting Tools Blend tool	`w`
Selecting Tools Live Paint Bucket tool	`k`
Selecting Tools Live Paint Selection tool	`Shift` + `l`
Selecting Tools Slice tool	`Shift` + `k`
Selecting Tools Eraser tool	`Shift` + `e`
Selecting Tools Scissors tool	`c`
Selecting Tools Hand tool	`h`
Selecting Tools Zoom tool	`z`
Selecting Tools Switch to Smooth tool while using Blob Brush tool	`Option`
Viewing Artwork Toggle between screen modes: Normal Screen Mode, Full Screen Mode with Menu Bar, Full Screen Mode	`f`
Viewing Artwork Fit imageable area in window	Double-click Hand tool
Viewing Artwork Magnify 100%	Double-click Zoom tool
Viewing Artwork Switch to Hand tool (when not in text-edit mode)	`Space`
Viewing Artwork Switch to Zoom tool in magnify mode	`⌘` + `Space`
Viewing Artwork Switch to Zoom tool in reduce mode	`⌘` + `Option` + `Space`
Viewing Artwork Move Zoom marquee while dragging with the Zoom tool	`Space`
Viewing Artwork Hide unselected artwork	`⌘` + `Option` + `Shift` + `3`
Viewing Artwork Convert between horizontal and vertical guide	`Option` +drag guide
Viewing Artwork Release guide	`⌘` + `Shift` +double-click guide
Viewing Artwork Show/Hide artboards	`⌘` + `Shift` + `h`
Viewing Artwork Show/Hide artboard rulers	`⌘` + `Option` + `r`
Viewing Artwork View all artboards in window	`⌘` + `Option` + `0` (zero)
Viewing Artwork Paste in place on the active artboard	`⌘` + `Shift` + `v`
Viewing Artwork Exit Artboard tool mode	`Esc`
Viewing Artwork Create artboard inside another artboard	`Shift` +drag
Viewing Artwork Select multiple artboards in the Artboards panel	`⌘` +click
Viewing Artwork Navigate to next document	`⌘` + `F6`
Viewing Artwork Navigate to previous document	`⌘` + `Shift` + `F6`
Viewing Artwork Navigate to next document group	`⌘` + `Option` + `F6`
Viewing Artwork Navigate to previous document group	`⌘` + `Option` + `Shift` + `F6`
Viewing Artwork Exit Full Screen mode	`Esc`
Drawing Constrain a shape’s proportions or orientation to: (1) equal height and width for rectangles, rounded rectangles, ellipses, and grids, (2) Increments of 45° for line and arc segments, or (3) Original orientation for polygons, stars, and flares	`Shift` +drag
Drawing Move a shape while drawing it	`Spacebar` +drag
Drawing Draw from the center of a shape (except for polygons, stars, and flares)	`Option` +drag
Drawing Keep the sides of a star straight	`Option` +drag
Drawing Increase or decrease polygon sides, star points, arc angle, spiral winds, or flare rays	Start dragging, then `Up Arrow` / `Down Arrow`
Drawing Keep the inner radius of a star constant	Start dragging, then `Up Arrow` / `Down Arrow`
Drawing Add or remove vertical lines from a rectangular grid or radial lines from a polar grid	Start dragging, then `Right Arrow` / `LeftArrow`
Drawing Add or remove horizontal lines from a rectangular grid or concentric lines from a polar grid	Start dragging, then `Up Arrow` / `Down Arrow`
Drawing Switch between an open and closed arc	Start dragging, then `c`
Drawing Flip an arc, keeping the reference point constant	Start dragging, then `f`
Drawing Add or subtract winds from a spiral while increasing the length of the spiral	Start dragging, then `Option` +drag
Drawing Change the decay rate of a spiral	Start dragging then `⌘` +drag
Drawing Decrease the skew value for horizontal dividers in a rectangular grid or radial dividers in a polar grid by 10%	Start dragging, then `f`
Drawing Increase the skew value for horizontal dividers in a rectangular grid or radial dividers in a polar grid by 10%	Start dragging, then `v`
Drawing Decrease the skew value for vertical dividers in a rectangular grid or concentric dividers in a polar grid by 10%	Start dragging, then `x`
Drawing Increase the skew value for vertical dividers in a rectangular grid or concentric dividers in a polar grid by 10%	Start dragging, then `c`
Drawing Create and expand a Live Trace object in one step	`Option` +click Live Trace in the Control panel, or hold down `Option` and select a tracing preset.
Drawing Increase size / decrease size of Blob Brush	`]` / `[`
Drawing Constrain Blob Brush path horizontally or vertically	`Shift`
Drawing Switch through drawing modes	`Shift` + `d`
Drawing Join two or more paths	Select the paths, then press `⌘` + `j`
Drawing Create corner or smooth join	Select the paths, then press `Shift` + `⌘` + `Option` + `j`
Drawing in perspective Perspective Grid Tool	`Shift` + `p`
Drawing in perspective Perspective Selection Tool	`Shift` + `v`
Drawing in perspective Perspective Grid	`⌘` + `Shift` + `i`
Drawing in perspective Moving objects perpendicularly	Press `5` key, then click and drag the object
Drawing in perspective Switching perspective planes 1 for left grid, 2 for horizontal grid, 3 for right grid, or 4 for no active grid	Use the Perspective Selection tool and then press `1` ... `4`
Drawing in perspective Copying objects in perspective	`⌘` + `Option` +drag
Drawing in perspective Repeat transforming objects in perspective	`⌘` + `d`
Drawing in perspective Switching between drawing modes	`Shift` + `d`
Keys for selecting Switch to last-used selection tool (Selection tool, Direct Selection tool, or Group Selection tool)	`⌘`
Keys for selecting Switch between Direct Selection tool and Group Selection tool	`Option`
Keys for selecting Add to a selection (or substract a selection) with Selection tool, Direct Selection tool, Group Selection tool, Live Paint Selection tool, or Magic Wand tool	`Shift` +click
Keys for selecting Subtract from selection with Magic Wand tool	`Option` +click
Keys for selecting Add to selection with Lasso tool	`Shift` +drag
Keys for selecting Subtract from selection with Lasso tool	`Option` +drag
Keys for selecting Change pointer to cross hair for Lasso tool	`Caps Lock`
Keys for selecting Select artwork in active artboard	`⌘` + `Option` + `a`
Keys for selecting Create crop marks around selected object	`Option` + `c` + `o`
Keys for selecting Select behind an object or select behind in isolation mode	`⌘` +click twice
Moving Selection Move selection in user-defined increments	`Arrow Keys`
Moving Selection Move selection in 10x user-defined increments	`Shift` + `Arrow Keys`
Moving Selection Lock all deselected artwork	`⌘` + `Option` + `Shift` + `2`
Moving Selection Constrain movement to 45° angle (except when using Reflect tool)	Hold down `Shift`
Editing Shapes - Switch Pen tool to Convert Anchor Point tool- Switch between Add Anchor Point tool and Delete Anchor Point tool- Switch Scissors tool to Add Anchor Point tool- Switch Pencil tool to Smooth tool	`Option`
Editing Shapes Move current anchor point while drawing with Pen tool	`Spacebar` +drag
Editing Shapes Cut a straight line with Knife tool	`Option` +drag
Editing Shapes Cut at 45° or 90° with Knife tool	`Shift` + `Option` -drag
Editing Shapes Use shape mode buttons in Pathfinder panel to create compound paths	`Option` +Shape mode
Editing Shapes Erase unwanted closed regions created using Shape Builder tool	`Option` +click the closed region
Editing Shapes Select the Shape Builder tool	`Shift` + `m`
Editing Shapes Display rectangular marquee to easily merge multiple paths (when using Shape Builder tool)	`Shift` +click+drag
Painting Objects Toggle between fill and stroke	`x`
Painting Objects Set fill and stroke to default	`d`
Painting Objects Swap fill and stroke	`Shift` + `x`
Painting Objects Select gradient fill mode	`>`
Painting Objects Select color fill mode	`<`
Painting Objects Select no stroke/fill mode	`/`
Painting Objects Sample color from an image or intermediate color from gradient	`Shift` Eyedropper tool
Painting Objects Sample style and append appearance of currently selected item	`Option` + `Shif` +click + Eyedropper tool
Painting Objects Add new fill	`⌘` + `/`
Painting Objects Add new stroke	`⌘` + `Option` + `/`
Painting Objects Reset gradient to black and white	`⌘` +click gradient button in Tools or Gradient panel
Painting Objects Open Mosaic options for selected raster object	`Option` + `o` + `j`
Painting Objects Decrease Bristle brush size / Increase Bristle brush size	`[` / `]`
Painting Objects Set Bristle brush paint opacity value to 10%, 20% etc. 0 increases to 100%	`1` , `2` ,... `0`
Live Paint Groups Switch to Eyedropper tool and sample fill and/or stroke	`Option` +click + Live Paint Bucket tool
Live Paint Groups Switch to Eyedropper tool and sample color from an image	`Option` + `Shift` +click + Live Paint Bucket tool
Live Paint Groups Select opposite Live Paint Bucket tool options	`Shift` + Live Paint Bucket tool
Live Paint Groups Fill across unstroked edges into adjacent faces	Double-click + Live Paint Bucket tool
Live Paint Groups Fill all faces that have same fill and stroke all edges that have same stroke	Triple-click + Live Paint Bucket tool
Live Paint Groups Switch to Eyedropper tool and sample fill and/or stroke	`Option` +click + Live Paint Selection tool
Live Paint Groups Switch to Eyedropper tool and sample color from an image or intermediate color from a gradient	`Option` + `Shift` +click + Live Paint Selection tool
Live Paint Groups Add to/subtract from a selection	`Shift` +click + Live Paint Selection tool
Live Paint Groups Select all connected faces /edges with same fill/stroke	Double-click + Live Paint Selection tool
Live Paint Groups Select all faces/edges with same fill/stroke	Triple-click + Live Paint Selection tool
Transforming Objects Set origin point and open dialog box when using Rotate tool, Scale tool, Reflect tool, or Shear tool	`Option` +click
Transforming Objects Duplicate and transform selection when using Selection tool, Scale tool, Reflect tool, or Shear tool	`Option` +drag
Transforming Objects Transform pattern (independent of object) when using Selection tool, Scale tool, Reflect tool, or Shear tool	`~` +drag
Creating variable width points Select multiple width points	`Shift` +click
Creating variable width points Create non-uniform widths	`Option` +drag
Creating variable width points Create a copy of the width point	`Option` +drag the width point
Creating variable width points Change the position of multiple width points	`Shift` +drag
Creating variable width points Delete selected width point	`Delete`
Creating variable width points Deselect a width point	`Esc`
Working with Type Move one character right or left	`Right Arrow` / `Left Arrow`
Working with Type Move up or down one line	`Up Arrow` / `Down Arrow`
Working with Type Move one word right or left	`⌘` + `Right Arrow` / `Left Arrow`
Working with Type Move up or down one paragraph	`⌘` + `Up Arrow` / `Down Arrow`
Working with Type Select one word right or left	`Shift` + `⌘` + `Right Arrow` / `Left Arrow`
Working with Type Select one paragraph before or after	`Shift` + `⌘` + `Right Arrow` / `Left Arrow`
Working with Type Extend existing selection	`Shift` +click
Working with Type Align paragraph left, right, or center	`⌘` + `Shift` + `l` , `r` , `c`
Working with Type Justify paragraph	`⌘` + `Shift` + `j`
Working with Type Insert soft return	`Shift` + `Enter`
Working with Type Highlight kerning	`⌘` + `Option` + `k`
Working with Type Reset horizontal scale to 100%	`⌘` + `Shift` + `x`
Working with Type Increase type size / decrease type size	`⌘` + `Shift` + `>` / `⌘` + `Shift` + `<`
Working with Type Increase or decrease leading (for horizontal text, vor vertical text use Option+Right Arrow/Left Arrow)	`Option` + `Up Arrow` / `Down Arrow`
Working with Type Set leading to the type size	Double-click leading icon in the Character panel
Working with Type Reset tracking/kerning to 0	`⌘` + `Option` + `q`
Working with Type Increase or decrease kerning and tracking (for horizontal text, vor vertical text use Option+Up Arrow/Down Arrow)	`Option` + `Right Arrow` / `Left Arrow`
Working with Type Increase or decrease kerning and tracking by five times(for horizontal text, vor vertical text use ⌘+Option+Up Arrow/Down Arrow)	`⌘` + `Option` + `Right Arrow` / `Left Arrow`
Working with Type Increase or decrease baseline shift (for horizontal text, vor vertical text use Option+Shift+Right Arrow/Left Arrow)	`Option` + `Shift` + `Up Arrow` / `Down Arrow`
Working with Type Switch between Type and Vertical Type, Area Type and Vertical Area Type, and Path Type and Vertical Path Type tools	`Shift`
Working with Type Switch between Area Type and Path Type, Vertical Area Type and Vertical Path Type tools	`Option`
Panel Shortcuts Set options (except for Actions, Brushes, Swatches, and Symbols panels)	`Option` +click New button
Panel Shortcuts Delete without confirmation (except for Layers panel)	`Option` +click Delete button
Panel Shortcuts Apply value and keep text box active	`Shift` + `Enter`
Panel Shortcuts Select range of actions, brushes, layers, links, styles, or swatches	`Shift` +click
Panel Shortcuts Select noncontiguous actions, brushes, layers (same level only), links, styles, or swatches	`⌘` +click
Panel Shortcuts Show/Hide all panels	`Tab`
Panel Shortcuts Show/Hide all panels except the Tools panel and Control panel	`Shift` + `Tab`