.Dd 2015-10-08
.Dt SED 1
.Os sbase
.Sh NAME
.Nm sed
.Nd stream editor
.Sh SYNOPSIS
.Nm
.Op Fl nrE
.Ar script
.Op Ar file ...
.Nm
.Op Fl nrE
.Fl e Ar script
.Op Fl e Ar script
.Ar ...
.Op Fl f Ar scriptfile
.Ar ...
.Op Ar file ...
.Nm
.Op Fl nrE
.Op Fl e Ar script
.Ar ...
.Fl f Ar scriptfile
.Op Fl f Ar scriptfile
.Ar ...
.Op Ar file ...
.Sh DESCRIPTION
.Nm
reads line oriented output from
.Ar file
or stdin, applies the editing commands supplied by
.Ar script
or
.Ar scriptfile
and writes the edited stream to stdout.
.Sh OPTIONS
.Bl -tag -width Ds
.It Fl n
Suppress default printing at the end of each cycle.
.It Fl r E
Use extended regular expressions
.It Fl e Ar script
Append
.Ar script
to the list of editing commands.
.It Fl f Ar scriptfile
Append the commands from
.Ar scriptfile
to the list of editing commands.
.El
.Sh EXTENDED DESCRIPTION
Editing commands take the form
.Pp
[address[,address]]function
.Ss Addresses
Addresses are either blank, a positive decimal integer denoting a line
number, the character '$' denoting the last line of input, or a regular
expression. A command with no addresses matches every line, one address
matches individual lines, and two addresses matches a range of lines
from the first to the second address inclusive.
.Ss Functions
.Bl -tag -width Ds
.It Ar a Op Ar text
Append text to output after end of current cycle.
.It Ar b Op Ar label
Branch to label. If no label is provided branch to end of script.
.It Ar c Op Ar text
Change. Delete addressed range and output text after end of current cycle.
.It Ar d
Delete pattern space and begin next cycle.
.It Ar D
Delete pattern space up to and including first newline and begin new
cycle without reading input. If there is no newline, behave like d.
.It Ar g
Get. Replace the pattern space with the hold space.
.It Ar G
Get. Append a newline and the hold space to the pattern space.
.It Ar h
Hold. Replace the hold space with the pattern space.
.It Ar H
Hold. Append a newline and the pattern space to the hold space.
.It Ar i Op Ar text
Insert text in output.
.It Ar l
List? Write the pattern space replacing known non printing characters with
backslash escaped versions (\\\\, \\a, \\b, \\f, \\r, \\t, \\v). Print
bad UTF-8 sequences as \\ooo where ooo is a three digit octal number. Mark
end of lines with '$'.
.It Ar n
Next. Write pattern space (unless
.Fl n ) ,
read next line into pattern space, and continue current cycle. If there
is no next line, quit.
.It Ar N
Next. Read next line, append newline and next line to pattern space,
and continue cycle. If there is no next line, quit without printing
current pattern space.
.It Ar p
Print current pattern space.
.It Ar P
Print current pattern space up to first newline.
.It Ar q
Quit.
.It Ar r file
Read file and write contents to output.
.It Ar s/re/text/flags
Find occurences of regular expression re in the pattern space and replace
with text. A '&' in text is replaced with the entire match. A \\d where
d is a decimal digit 1-9 is replaced with the corresponding match group
from the regular expression. \\n represents a newline in both the regular
expression and replacement text. A literal newline in the replacement
text must be preceded by a \\.
.Pp
Flags are
.Bl -tag -width Ds
.It Ar n
A positive decimal number denoting which match in the pattern space
to replace.
.It Ar g
Global. Replace all matches in the pattern space.
.It Ar p
Print the pattern if a replacement was made.
.It Ar w file
Write the pattern space to file if a replacement was made.
.El
.It Ar t Op Ar label
Test. Branch to corresponding labelif a substitution has been made since
the last line was read or last t command was executed. If no label is
provided branch to end of script.
.It Ar w file
Write pattern space to file.
.It Ar x
Exchange hold space and pattern space.
.It Ar y/set1/set2/
Replace each occurrence of a character from set 1 with the corresponding
character from set 2.
.It Ar :label
Create a label for b and t commands.
.It Ar =
Write current input line number to output.
.El