window.1

早期freebsd实现

.It Xo
.Aq Va expr1
.Ic \&&
.Aq Va expr2
.Xc
Bitwise and.  Numeric values only.
.It Xo
.Aq Va expr1
.Ic ==
.Aq Va expr2 ,
.Aq Va expr1
.Ic !=
.Aq expr2
.Xc
Comparison (equal and not equal, respectively).  The boolean
result (either 1 or 0) of the comparison is returned.  The
operands can be numeric or string valued.  One string operand
forces the other to be converted to a string in necessary.
.It Xo
.Aq Va expr1
.Ic <
.Aq Va expr2 ,
.Aq Va expr1
.Ic >
.Aq Va expr2 ,
.Aq Va expr1
.Ic <=
.Aq Va expr2 ,
.Xc
Less than, greater than, less than or equal to,
greater than or equal to.  Both numeric and string values, with
automatic conversion as above.
.It Xo
.Aq Va expr1
.Ic <<
.Aq Va expr2 ,
.Aq Va expr1
.Ic >>
.Aq Va expr2
.Xc
If both operands are numbers,
.Aq Va expr1
is bit
shifted left (or right) by
.Aq Va expr2
bits.  If
.Aq Va expr1
is
a string, then its first (or last)
.Aq Va expr2
characters are
returns (if
.Aq Va expr2
is also a string, then its length is used
in place of its value).
.It Xo
.Aq Va expr1
.Ic +
.Aq Va expr2 ,
.Aq Va expr1
.Ic -
.Aq Va expr2
.Xc
Addition and subtraction on numbers.  For ``+'', if one
argument is a string, then the other is converted to a string,
and the result is the concatenation of the two strings.
.It Xo
.Aq Va expr1
.Ic \&*
.Aq Va expr2 ,
.Aq Va expr1
.Ic \&/
.Aq Va expr2 ,
.Aq Va expr1
.Ic \&%
.Aq Va expr2
.Xc
Multiplication, division, modulo.  Numbers only.
.It Xo
.Ic \- Ns Aq Va expr ,
.Ic ~ Ns Aq Va expr ,
.Ic \&! Ns Aq Va expr ,
.Ic \&$ Ns Aq Va expr ,
.Ic \&$? Ns Aq Va expr
.Xc
The first three are unary minus, bitwise complement and logical complement
on numbers only.  The operator, ``$'', takes
.Aq Va expr
and returns
the value of the variable of that name.  If
.Aq Va expr
is numeric
with value
.Ar n
and it appears within an alias macro (see below),
then it refers to the nth argument of the alias invocation.  ``$?''
tests for the existence of the variable
.Aq Va expr ,
and returns 1
if it exists or 0 otherwise.
.It Xo
.Ao Va expr Ac Ns Pq Aq Ar arglist
.Xc
Function call.
.Aq Va Expr
must be a string that is the unique
prefix of the name of a builtin
.Nm window
function
or the full name of a user defined alias macro.  In the case of a builtin
function,
.Aq Ar arglist
can be in one of two forms:
.Bd -literal -offset indent
<expr1>, <expr2>, ...
argname1 = <expr1>, argname2 = <expr2>, ...
.Ed
.Pp
The two forms can in fact be intermixed, but the result is
unpredictable.  Most arguments can be omitted; default values will
be supplied for them.  The
.Ar argnames
can be unique prefixes
of the argument names.  The commas separating
arguments are used only to disambiguate, and can usually be omitted.
.Pp
Only the first argument form is valid for user defined aliases.  Aliases
are defined using the
.Ic alias
builtin function (see below).  Arguments
are accessed via a variant of the variable mechanism (see ``$'' operator
above).
.Pp
Most functions return value, but some are used for side effect
only and so must be used as statements.  When a function or an alias is used
as a statement, the parentheses surrounding
the argument list may be omitted.  Aliases return no value.
.El
.Ss  Builtin Functions
The arguments are listed by name in their natural
order.  Optional arguments are in square brackets
.Sq Op .
Arguments
that have no names are in angle brackets
.Sq <> .
An argument meant to be a boolean flag (often named
.Ar flag )
can be one of
.Ar on ,
.Ar off ,
.Ar yes ,
.Ar no ,
.Ar true ,
or
.Ar false ,
with
obvious meanings, or it can be a numeric expression,
in which case a non-zero value is true.
.Bl -tag -width Fl
.It Xo
.Ic alias Ns Po Bq Aq Ar string ,
.Bq Aq Ar string\-list Pc
.Xc
If no argument is given, all currently defined alias macros are
listed.  Otherwise,
.Aq Ar string
is defined as an alias,
with expansion
.Aq Ar string\-list > . 
The previous definition of
.Aq Ar string ,
if any, is returned.  Default for
.Aq Ar string\-list
is no change.
.It Ic close Ns Pq Aq Ar window\-list
Close the windows specified in
.Aq Ar window\-list .
If
.Aq Ar window\-list
is the word
.Ar all  ,
than all windows are closed.  No value is returned.
.It Ic cursormodes Ns Pq Bq Ar modes
Set the window cursor to
.Ar modes  .
.Ar Modes
is the bitwise
or of the mode bits defined as the variables
.Ar m_ul
(underline),
.Ar m_rev
(reverse video),
.Ar m_blk
(blinking),
and
.Ar m_grp
(graphics, terminal dependent).  Return
value is the previous modes.  Default is no change.
For example,
.Li cursor($m_rev$m_blk)
sets the window cursors to blinking
reverse video.
.It Ic default_nline Ns Pq Bq Ar nline
Set the default buffer size to
.Ar nline  .
Initially, it is
48 lines.  Returns the old default buffer size.  Default is
no change.  Using a very large buffer can slow the program down
considerably.
.It Ic default_shell Ns Pq Bq Aq Ar string\-list
Set the default window shell program to
.Aq Ar string\-list .
Returns
the first string in the old shell setting.  Default is no change.  Initially,
the default shell is taken from the environment variable
.Ev SHELL  .
.It Ic default_smooth Ns Pq Bq Ar flag
Set the default value of the
.Ar smooth
argument
to the command
.Nm window
(see below).  The argument
is a boolean flag (one of
.Ar on  ,
.Ar off  ,
.Ar yes  ,
.Ar no  ,
.Ar true  ,
.Ar false  ,
or a number,
as described above).  Default is no change.
The old value (as a number) is returned.
The initial value is 1 (true).
.It Xo
.Ic echo Ns ( Op Ar window ,
.Bq Aq Ar string\-list )
.Xc
Write the list of strings,
.Aq Ar string-list ,
to
.Nm window  ,
separated
by spaces and terminated with a new line.  The strings are only
displayed in the window, the processes in the window are not
involved (see
.Ic write
below).  No value is returned.  Default
is the current window.
.It Ic escape Ns Pq Bq Ar escapec
Set the escape character to
.Ar escape-char  .
Returns the old
escape character as a one-character string.  Default is no
change.
.Ar Escapec
can be a string of a single character, or
in the form
.Fl ^X ,
meaning
.No control\- Ns Ar X .
.It Xo
.Ic foreground Ns ( Bq Ar window ,
.Bq Ar flag ) 
.Xc
Move
.Nm window
in or out of foreground.
.Ar Flag
is a boolean value.  The old foreground flag
is returned.  Default for
.Nm window
is the current window,
default for
.Ar flag
is no change.
.It Xo
.Ic label Ns ( Bq Ar window ,
.Bq Ar label ) 
.Xc
Set the label of
.Nm window
to
.Ar label  .
Returns the old
label as a string.  Default for
.Nm window
is the current
window, default for
.Ar label
is no change.  To turn
off a label, set it to an empty string ("").
.It Ic list Ns Pq
No arguments.  List the identifiers and labels of all windows.  No
value is returned.
.It Ic select Ns Pq Bq Ar window
Make
.Nm window
the current window.  The previous current window
is returned.  Default is no change.
.It Ic source Ns Pq Ar filename
Read and execute the long commands in
.Ar filename  .
Returns \-1 if the file cannot be read, 0 otherwise.
.It Ic terse Ns Pq Bq flag
Set terse mode to
.Ar flag  .
In terse mode, the command window
stays hidden even in command mode, and errors are reported by
sounding the terminal's bell.
.Ar Flag
can take on the same
values as in
.Ar foreground
above.  Returns the old terse flag.
Default is no change.
.It Ic unalias Ns Pq Ar alias
Undefine
.Ar alias  .
Returns -1 if
.Ar alias
does not exist,
0 otherwise.
.It Ic unset Ns Pq Ar variable
Undefine
.Ar variable  .
Returns -1 if
.Ar variable
does not exist,
0 otherwise.
.It Ic variables Ns Pq
No arguments.  List all variables.  No value is returned.
.It Xo
.Ic window Ns ( Bq Ar row ,
.Bq Ar column ,
.Bq Ar nrow ,
.Bq Ar ncol ,
.Bq Ar nline ,
.Bq Ar label ,
.Bq Ar pty , 
.Bq Ar frame ,
.Bq Ar mapnl ,
.Bq Ar keepopen ,
.Bq Ar smooth ,
.Bq Ar shell ) . 
.Xc
Open a window with upper left corner at
.Ar row  ,
.Ar column
and size
.Ar nrow  ,
.Ar ncol  .
If
.Ar nline
is specified,
then that many lines are allocated for the text buffer.  Otherwise,
the default buffer size is used.  Default values for
.Ar row  ,
.Ar column  ,
.Ar nrow  ,
and
.Ar ncol
are, respectively,
the upper, left-most, lower, or right-most extremes of the
screen.
.Ar Label
is the label string.
.Ar Frame  ,
.Ar pty  ,
and
.Ar mapnl
are flag values
interpreted in the same way as the argument to
.Ar foreground
(see above);
they mean, respectively, put a frame around this window (default true),
allocate pseudo-terminal for this window rather than socketpair (default
true), and map new line characters in this window to carriage return
and line feed (default true if socketpair is used, false otherwise).
Normally, a window is automatically closed when its process
exits.  Setting
.Ar keepopen
to true (default false) prevents this
action.  When
.Ar smooth
is true, the screen is updated more frequently
(for this window) to produce a more terminal-like behavior.
The default value of
.Ar smooth
is set by the
.Ar default_smooth
command (see above).
.Ar Shell
is a list of strings that will be used as the shell
program to place in the window (default is the program specified
by
.Ar default_shell  ,
see above).  The created window's identifier
is returned as a number.
.It Xo
.Ic write Ns ( Bq Ar window ,
.Bq Aq Ar string\-list )
.Xc
Send the list of strings,
.Aq Ar string-list ,
to
.Nm window  ,
separated
by spaces but not terminated with a new line.  The strings are actually
given to the window as input.  No value is returned.  Default
is the current window.
.El
.Ss Predefined Variables
These variables are for information only.  Redefining them does
not affect the internal operation of
.Nm window  .
.Bl -tag -width modes
.It Ar baud
The baud rate as a number between 50 and 38400.
.It Ar modes
The display modes (reverse video, underline, blinking, graphics)
supported by the physical terminal.  The value of
.Ar modes
is the bitwise or of some of the one bit values,
.Ar m_blk ,
.Ar m_grp ,
.Ar m_rev ,
and
.Ar m_ul
(see below).
These values are useful
in setting the window cursors' modes (see
.Ar cursormodes
above).
.It Ar m_blk
The blinking mode bit.
.It Ar m_grp
The graphics mode bit (not very useful).
.It Ar m_rev
The reverse video mode bit.
.It Ar m_ul
The underline mode bit.
.It Ar ncol
The number of columns on the physical screen.
.It Ar nrow
The number of rows on the physical screen.
.It Ar term
The terminal type.  The standard name, found in the second name
field of the terminal's
.Ev TERMCAP
entry, is used.
.Sh ENVIRONMENT
.Nm Window
utilizes these environment variables:
.Ev HOME ,
.Ev SHELL ,
.Ev TERM ,
.Ev TERMCAP ,
.Ev WINDOW_ID .
.Sh FILES
.Bl -tag -width /dev/[pt]ty[pq]? -compact
.It Pa ~/.windowrc
startup command file.
.It Pa /dev/[pt]ty[pq]? 
pseudo-terminal devices.
.El
.Sh HISTORY
The
.Nm window
command appeared in
.Bx 4.3 .
.Sh DIAGNOSTICS
Should be self explanatory.