27
(standard input default) to the standard output,
28
edited according to a script of commands.
31
option causes the script to be taken from file
33
these options accumulate.
43
option suppresses the default output;
45
causes all substitutions to be global, as if suffixed
48
A script consists of editing commands, one per line,
49
of the following form:
51
[\fIaddress\fR [\fL,\fI address\fR] ] \fIfunction\fR [\fIargument\fR ...]
55
cyclically copies a line of input into a
57
(unless there is something left after
64
select that pattern space,
65
and at the end of the script copies the pattern space
66
to the standard output (except under
68
and deletes the pattern space.
72
is either a decimal number that counts
73
input lines cumulatively across files, a
76
addresses the last line of input, or a context address,
77
.BI / regular-expression / \f1,
80
with the added convention that
83
newline embedded in the pattern space.
85
A command line with no addresses selects every pattern space.
88
one address selects each pattern space that matches the address.
91
two addresses selects the inclusive range from the first
92
pattern space that matches the first address through
93
the next pattern space that matches
95
(If the second address is a number less than or equal
96
to the line number first selected, only one
98
Thereafter the process is repeated, looking again for the
101
Editing commands can be applied to non-selected pattern
102
spaces by use of the negation function
108
consists of one or more lines,
109
all but the last of which end with
113
Backslashes in text are treated like backslashes
114
in the replacement string of an
117
and may be used to protect initial blanks and tabs
118
against the stripping that is done on
125
must terminate the command
126
line and must be preceded by exactly one blank.
129
is created before processing begins.
130
There can be at most 120 distinct
133
.TP \w'\fL!\ \fIfunction\fLXXX'u
143
reading the next input line.
152
is empty, branch to the end of the script.
160
Delete the pattern space.
161
With 0 or 1 address or at the end of a 2-address range, place
164
Start the next cycle.
167
Delete the pattern space.
168
Start the next cycle.
171
Delete the initial segment of the
172
pattern space through the first newline.
173
Start the next cycle.
176
Replace the contents of the pattern space
177
by the contents of the hold space.
180
Append the contents of the hold space to the pattern space.
183
Replace the contents of the hold space by the contents of the pattern space.
186
Append the contents of the pattern space to the hold space.
197
on the standard output.
200
Copy the pattern space to the standard output.
201
Replace the pattern space with the next line of input.
204
Append the next line of input to the pattern space
205
with an embedded newline.
206
(The current line number changes.)
210
Copy the pattern space to the standard output.
213
Copy the initial segment of the pattern space through
214
the first newline to the standard output.
218
Branch to the end of the script.
219
Do not start a new cycle.
224
Place them on the output before reading
227
.B s/\fIregular-expression\fP/\fIreplacement\fP/\fIflags
230
string for instances of the
231
.I regular-expression
232
in the pattern space.
233
Any character may be used instead of
235
For a fuller description see
243
Substitute for all non-overlapping instances of the
244
.I regular expression
249
Print the pattern space if a replacement was made.
253
Append the pattern space to
266
substitutions have been made since the most recent
267
reading of an input line or execution of a
271
is empty, branch to the end of the script.
277
Append the pattern space to
281
Exchange the contents of the pattern and hold spaces.
283
.B y/\fIstring1\fP/\fIstring2\fP/
285
Replace all occurrences of characters in
287
with the corresponding character in
306
selected by the address(es).
309
This command does nothing; it bears a
315
commands to branch to.
318
Place the current line number on the standard output as a line.
321
Execute the following commands through a matching
323
only when the pattern space is selected.
326
An empty command is ignored.
331
Print the first 10 lines of the file.
334
Delete empty lines from standard input.
336
.B sed 's/UNIX/& system/g'
337
Replace every instance of
343
sed 's/ *$// \fRdrop trailing blanks\fP
344
/^$/d \fRdrop empty lines\fP
345
s/ */\e \fRreplace blanks by newlines\fP
354
etc. one word to a line.
357
nroff -ms manuscript | sed '
359
/^$/p \fRif last line of file is empty, print it\fP
361
//N \fRif current line is empty, append next line\fP
362
/^\en$/D' \fRif two lines are empty, delete the first\fP
366
Delete all but one of each group of empty lines from a
367
formatted manuscript.
379
`SED \(em A Non-interactive Text Editor',
380
Unix Research System Programmer's Manual, Volume 2.
382
If input is from a pipe, buffering may consume
383
characters beyond a line on which a
added
removed
sed/sed.1
