ex.summary

早期freebsd实现

\fR"ch9" [Modified] 3 lines ...
\*c
.fi
T}
.SP
(1,$)\fBglobal	g	\fBglobal/\fIpattern\fB/\fIcommands	T{
.nf
:\fBg/nonsense/d
\fR\*c
.fi
T}
\fR(1,$)\fBglobal!	g!\fR or \fBv	T{
Searches the entire buffer (unless a smaller
range is specified by line-number prefixes) and
executes \fIcommands\fR on every line with
an expression matching \fIpattern\fR.
The second form, abbreviated
either \fBg!\fR or \fBv\fR,
executes \fIcommands\fR on lines that \fIdo
not\fR contain the expression \fIpattern\fR.
T}	\^
.SP
\fR(.)\fBinsert	i	T{
Inserts new lines of text immediately before the specified line.
Differs from
.I append
only in that text is placed before, rather than after, the indicated line.
In other words, \fB1i\fR has the same effect as \fB0a\fR.
T}	T{
.nf
:\fB1i
These lines of text will
be added prior to line 1.
\&.
\fR:
.fi
T}	\^
.SP
\fR(.,.+1)\fBjoin	j	T{
Join lines together, adjusting white space (spaces
and tabs) as necessary.
T}	T{
.nf
:\fB2,5j\fR
Resulting line is printed
:
.fi
T}	\^
.TE
.bp
.TS
cp10 cp10 cp10 cp10
ltw(1.0i) lt2w(0.40i)fB ltw(3.0i) ltw(1.8i).
Name	Abbr	Description	Examples
.sp 1.75
\fR(.,.)\fBlist	l	T{
\fRPrints lines in a more
unambiguous way than the \fIprint\fR
command does. The end of a line,
for example, is marked with a ``$'',
and tabs printed as ``^I''.
T}	T{
.nf
:\fB9l
\fRThis is line 9$
\*c
.fi
T}
.TE
.sp 0.5v
.TS
ltw(1.0i) lt2w(0.40i)fB ltw(3.0i) ltw(1.8i).
\fR(.,.)\fBmove \fIaddr\fB	m	T{
\fRMoves the specified lines
to a position after the line
indicated by \fIaddr\fR.
T}	T{
.nf
\fR:\fB12,15m 25\fR
New current line is printed
\*c
.fi
T}
.SP
\fR(.,.)\fBnumber	nu	T{
Prints each line preceded
by its buffer line number.
T}	T{
.nf
\fR:\fBnu
\0\0\fR10\0 This is line 10
\*c
.fi
T}
.SP
\fR(.)\fBopen	o	T{
Too involved to discuss here,
but if you enter open mode
accidentally, press
the \s-2ESC\s0 key followed by
\fBq\fR to
get back into normal editor
command mode.
\fIEdit\fP is designed to
prevent accidental use of
the open command.
T}	
.SP
\fBpreserve	pre	T{
Saves a copy of the current buffer contents as though the system had
just crashed.  This is for use in an emergency when a
.I write
command has failed and you don't know how else to save your work.\(dg
T}	T{
.nf
:\fBpreserve\fR
File preserved.
:
.fi
T}
.SP
\fR(.,.)\fBprint	p	Prints the text of line(s).	T{
.nf
:\fB+2,+3p\fR
The second and third lines
after the current line
:
.fi
T}
.TE
.FS
\(dg Seek assistance from a consultant as soon as possible
after saving a file with the
.I preserve
command, because the file is saved on system storage space for only one week.
.FE
.SP
.nf
.TS
ltw(1.0i) lt2w(0.40i)fB ltw(3.0i) ltw(1.8i).
T{
.nf
\fBquit
quit!
.fi
T}	T{
.nf
q
q!
T}	T{
.fi
\fREnds the editing session.
You will receive a
warning if you have changed the buffer
since last writing its contents
to the file. In this event you
must either type \fBw\fR to write,
or type \fBq!\fR to exit from
the editor without saving your changes.
T}	T{
.nf
\fR:\fBq
\fRNo write since last change
:\fBq!
\fR%
.fi
T}
.SP
\fR(.)\fBread \fIfile\fP	r	T{
.fi
\fRPlaces a copy of \fIfile\fR in the
buffer after the specified line.
Address 0 is permissible and causes
the copy of \fIfile\fR to be placed
at the beginning of the buffer.
The \fIread\fP command does not
erase any text already in the buffer.
If no line number is specified,
\fIfile\fR is placed after the
current line.
T}	T{
.nf
\fR:\fB0r newfile
\fR"newfile" 5 lines, 86 characters
\*c
.fi
T}
.SP
\fBrecover \fIfile\fP	rec	T{
.fi
Retrieves a copy of the editor buffer
after a system crash, editor crash,
phone line disconnection, or
\fIpreserve\fR command.
T}
.SP
\fR(.,.)\fBsubstitute	s	T{
.nf
\fBsubstitute/\fIpattern\fB/\fIreplacement\fB/
substitute/\fIpattern\fB/\fIreplacement\fB/gc
.fi
\fRReplaces the first occurrence of \fIpattern\fR
on a line
with \fIreplacement\fP.
Including a \fBg\fR after the command
changes all occurrences of \fIpattern\fP
on the line.
The \fBc\fR option allows the user to
confirm each substitution before it is
made; see the manual for details.
T}	T{
.nf
:\fB3p
\fRLine 3 contains a misstake
:\fBs/misstake/mistake/
\fRLine 3 contains a mistake
\*c
.fi
T}
.TE
.bp
.TS
cp10 cp10 cp10 cp10
ltw(1.0i) lt2w(0.40i)fB ltw(3.0i) ltw(1.8i).
Name	Abbr	Description	Examples
.sp 1.75
\fBundo	u	T{
.fi
\fRReverses the changes made in
the buffer by the last buffer-editing
command.
Note that this example contains
a notification about the number of
lines affected.
T}	T{
.nf
\fR:\fB1,15d
\fR15 lines deleted
new line number 1 is printed
:\fBu
\fR15 more lines in file ...
old line number 1 is printed
\*c
.fi
T}
.SP
\fR(1,$)\fBwrite \fIfile\fR	w	T{
.fi
\fRCopies data from the buffer onto
a permanent file. If no \fIfile\fR
is named, the current filename
is used.
The file is automatically created
if it does not yet exist.
A response containing the number of
lines and characters in the file
indicates that the write
has been completed successfully.
The editor's built-in protections
against overwriting existing files
will in some circumstances
inhibit a write.
The form \fBw!\fR forces the
write, confirming that
an existing file is to be overwritten.
T}	T{
.nf
\fR:\fBw
\fR"file7" 64 lines, 1122 characters
:\fBw file8
\fR"file8" File exists ...
:\fBw! file8
\fR"file8" 64 lines, 1122 characters
\*c
.fi
T}
\fR(1,$)\fBwrite! \fIfile\fP	w!	\^	\^
.TE
.sp 0.5v
.TS
ltw(1.0i) lt2w(0.40i)fB ltw(3.0i) ltw(1.8i).
\fR(.)\fBz \fIcount\fP	z	T{
.fi
\fRPrints a screen full of text starting
with the line indicated;
or, if \fIcount\fR is specified,
prints that number of lines.
Variants of the \fIz\fR command
are described in the manual.
T}	
.SP
\fB!\fIcommand		T{
.fi
Executes the remainder of the line
after \fB!\fR as a \*U command.
The buffer is unchanged by this, and
control is returned to the editor when
the execution of \fIcommand\fR is complete.
T}	T{
.nf
\fR:\fB!date
\fRFri Jun 9 12:15:11 PDT 1978
!
\*c
.fi
T}
.SP
\fRcontrol-d		T{
.fi
Prints the next \fIscroll\fR of text,
normally half of a screen. See the
manual for details of the \fIscroll\fR
option.
T}
.SP
\fR(.+1)<cr>		T{
.fi
An address alone followed by a carriage
return causes the line to be printed.
A carriage return by itself prints the
line following the current line.
T}	T{
.nf
:\fR<cr>
the line after the current line
\*c
.fi
T}
.TE
.sp 0.5v
.TS
ltw(1.0i) lt2w(0.40i)fB ltw(3.0i) ltw(1.8i).
\fB/\fIpattern\fB/		T{
.fi
\fRSearches for the next line in which
\fIpattern\fR occurs and prints it.
T}	T{
.nf
\fR:\fB/This pattern/
\fRThis pattern next occurs here.
\*c
.fi
T}
.SP
\fB//		T{
Repeats the most recent search.
T}	T{
.nf
\fR:\fB//
\fRThis pattern also occurs here.
\*c
.fi
T}
.SP
\fB?\fIpattern\fB?		T{
Searches in the reverse direction
for \fIpattern\fP.
T}	
.SP
\fB??		T{
Repeats the most recent search,
moving in the reverse direction
through the buffer.
T}
.TE