How to escape out of the MAN screen or page in UNIX?

The man command uses your default pager, which is specified by $MANPAGER if it's set, or by $PAGER. If neither is set, it defaults to something reasonable, probably either more or less. (Oddly, I don't see this in the man page for the man command, which you can view by typing man man -- once you get back to your shell prompt.)

Most pagers can be exited by typing q -- which is going to be a useful thing to know for other programs that invoke your pager, or when you use your pager directly to view a file (less some-file.txt).

When I run the man command on my system, the bottom line shows:

Manual page ls(1) line 1 (press h for help or q to quit)

in reverse video. Do you see that? (You may or may not, depending on your settings.)

If your pager is less, then you can get more information by typing h for help -- or by typing man less.

You can press the q key to exit the man pages.

FYI:

In my experience, the man generally uses less to display the information. To get a helpful list of keyboard shortcuts (navigation, exiting) for less (and for man), you can type in:

less --help

Here is a brief exerpt:

                   SUMMARY OF LESS COMMANDS      Commands marked with * may be preceded by a number, N.      Notes in parentheses indicate the behavior if N is given.  h  H                 Display this help.  q  :q  Q  :Q  ZZ     Exit. ---------------------------------------------------------------------------                           MOVING  e  ^E  j  ^N  CR  *  Forward  one line   (or N lines).  y  ^Y  k  ^K  ^P  *  Backward one line   (or N lines).  f  ^F  ^V  SPACE  *  Forward  one window (or N lines).  b  ^B  ESC-v      *  Backward one window (or N lines).  z                 *  Forward  one window (and set window to N).  w                 *  Backward one window (and set window to N).  ESC-SPACE         *  Forward  one window, but don't stop at end-of-file.  d  ^D             *  Forward  one half-window (and set half-window to N).  u  ^U             *  Backward one half-window (and set half-window to N).  ESC-)  RightArrow *  Left  one half screen width (or N positions).  ESC-(  LeftArrow  *  Right one half screen width (or N positions).  F                    Forward forever; like "tail -f".  r  ^R  ^L            Repaint screen.  R                    Repaint screen, discarding buffered input.        ---------------------------------------------------        Default "window" is the screen height.        Default "half-window" is half of the screen height.

Just type qand enter this will get you out of any man page