The following tools work with Macintosh files, disks, applications, and the Mac's clipboard:
bless
Makes a system folder bootable.
diskutil
Manipulates disks and volumes.
ditto
Copies directories, and optionally includes resource forks for copied files.
hdiutil
Manipulates disk images.
installer
Installs packages; command-line tool.
lsbom
Lists the contents of a Bill of Materials (BOM) file, such as those deposited under /Library/Receipts.
open
Opens a file or directory. See "The open Command" in Chapter 1.
pbcopy
Copies standard input to the clipboard.
pbpaste
Sends the contents of the clipboard to standard output.
pstopdf
Convert EPS and PS files to PDF format.
screencapture
Takes a screenshot of a window or the screen.
sips
Scriptable image processing system for altering image files.