-a   include all capabilities (with some minor exceptions) in each window's termcap, even if screen  must
     redraw parts of the display in order to implement a function.

-A   Adapt  the  sizes  of  all windows to the size of the current terminal.  By default, screen tries to
     restore its old window sizes  when  attaching  to  resizable  terminals  (those  with  "WS"  in  its
     description, e.g. suncmd or some xterm).

-c file
     override the default configuration file from "$HOME/.screenrc" to file.

-d|-D [pid.tty.host]
     does  not start screen, but detaches the elsewhere running screen session. It has the same effect as
     typing "C-a d" from screen's controlling terminal. -D is the equivalent to the power detach key.  If
     no  session  can  be  detached,  this  option  is ignored. In combination with the -r/-R option more
     powerful effects can be achieved:

-d -r   Reattach a session and if necessary detach it first.

-d -R   Reattach a session and if necessary detach or even create it first.

-d -RR  Reattach a session and if necessary detach or create it. Use the first session if more  than  one
        session is available.

-D -r   Reattach a session. If necessary detach and logout remotely first.

-D -R   Attach  here  and now. In detail this means: If a session is running, then reattach. If necessary
        detach and logout remotely first.  If it was not running create it and notify the user.  This  is
        the author's favorite.

-D -RR  Attach here and now. Whatever that means, just do it.

     Note: It is always a good idea to check the status of your sessions by means of "screen -list".

-e xy
     specifies  the command character to be x and the character generating a literal command character to
     y (when typed after the command character).  The default is "C-a" and `a', which can be specified as
     "-e^Aa".   When  creating  a  screen  session,  this option sets the default command character. In a
     multiuser session all users added will start off with this command character. But when attaching  to
     an  already  running  session, this option changes only the command character of the attaching user.
     This option is equivalent to either the commands "defescape" or "escape" respectively.

-f, -fn, and -fa
     turns flow-control on, off, or "automatic switching mode".  This can also  be  defined  through  the
     "defflow" .screenrc command.

-h num
     Specifies the history scrollback buffer to be num lines high.

-i   will cause the interrupt key (usually C-c) to interrupt the display immediately when flow-control is
     on.  See the "defflow" .screenrc command for details.  The use of this option is discouraged.

-l and -ln
     turns login mode on or off (for /var/run/utmp updating).  This  can  also  be  defined  through  the
     "deflogin" .screenrc command.

-ls and -list
     does not start screen, but prints a list of pid.tty.host strings and creation timestamps identifying
     your screen sessions.  Sessions marked `detached' can be resumed  with  "screen  -r".  Those  marked
     `attached' are running and have a controlling terminal. If the session runs in multiuser mode, it is
     marked `multi'. Sessions marked as `unreachable' either live on a different host or are `dead'.   An
     unreachable  session is considered dead, when its name matches either the name of the local host, or
     the specified parameter, if any.  See the -r flag  for  a  description  how  to  construct  matches.
     Sessions  marked  as `dead' should be thoroughly checked and removed.  Ask your system administrator
     if you are not sure. Remove sessions with the -wipe option.

-L   tells screen to turn on automatic output logging for the windows.

-m   causes screen to ignore the $STY environment variable. With "screen -m" creation of a new session is
     enforced,  regardless  whether screen is called from within another screen session or not. This flag
     has a special meaning in connection with the `-d' option:

-d -m   Start screen in "detached" mode. This creates a new session but doesn't attach  to  it.  This  is
        useful for system startup scripts.

-D -m   This  also starts screen in "detached" mode, but doesn't fork a new process. The command exits if
        the session terminates.

-O   selects a more optimal output mode for your terminal rather than true VT100 emulation (only  affects
     auto-margin terminals without `LP').  This can also be set in your .screenrc by specifying `OP' in a
     "termcap" command.

-p number_or_name
     Preselect a window. This is useful when you want to reattach to a specific window  or  you  want  to
     send  a  command  via  the  "-X"  option  to a specific window. As with screen's select command, "-"
     selects the blank window. As a special case for reattach, "=" brings up the windowlist on the  blank
     window.

-q   Suppress  printing  of  error  messages.  In  combination with "-ls" the exit value is as follows: 9
     indicates a directory without sessions. 10 indicates a directory with  running  but  not  attachable
     sessions.  11  (or  more)  indicates 1 (or more) usable sessions.  In combination with "-r" the exit
     value is as follows: 10 indicates that there is no session to resume. 12 (or  more)  indicates  that
     there  are  2 (or more) sessions to resume and you should specify which one to choose.  In all other
     cases "-q" has no effect.

-r [pid.tty.host]
-r sessionowner/[pid.tty.host]
     resumes a detached screen session.  No  other  options  (except  combinations  with  -d/-D)  may  be
     specified, though an optional prefix of [pid.]tty.host may be needed to distinguish between multiple
     detached screen sessions.  The second form is used to connect to another user's screen session which
     runs  in  multiuser  mode.  This  indicates  that  screen should look for sessions in another user's
     directory. This requires setuid-root.

-R   attempts to resume the youngest (in terms of creation time) detached screen session  it  finds.   If
     successful, all other command-line options are ignored.  If no detached session exists, starts a new
     session using the specified options, just as if -R had not been specified.  The  option  is  set  by
     default  if  screen  is  run  as  a  login-shell  (actually  screen  uses "-xRR" in that case).  For
     combinations with the -d/-D option see there.   Note:  Time-based  session  selection  is  a  Debian
     addition.

-s   sets  the  default  shell to the program specified, instead of the value in the environment variable
     $SHELL (or "/bin/sh" if not defined).  This can  also  be  defined  through  the  "shell"  .screenrc
     command.

-S sessionname
     When  creating  a new session, this option can be used to specify a meaningful name for the session.
     This name identifies the session for "screen -list" and "screen  -r"  actions.  It  substitutes  the
     default [tty.host] suffix.

-t name
     sets  the  title  (a.k.a.)  for  the  default shell or specified program.  See also the "shelltitle"
     .screenrc command.

-U   Run screen in UTF-8 mode. This option tells screen that your terminal sends  and  understands  UTF-8
     encoded characters. It also sets the default encoding for new windows to `utf8'.

-v   Print version number.

-wipe [match]
     does the same as "screen -ls", but removes destroyed sessions instead of marking them as `dead'.  An
     unreachable session is considered dead, when its name matches either the name of the local host,  or
     the explicitly given parameter, if any.  See the -r flag for a description how to construct matches.

-x   Attach to a not detached screen session. (Multi display mode).  Screen refuses to attach from within
     itself.  But when cascading multiple screens, loops are not detected; take care.

-X   Send the specified command to a running screen session. You can use the -d  or  -r  option  to  tell
     screen to look only for attached or detached screen sessions. Note that this command doesn't work if
     the session is password protected.