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     SED(C)		      XENIX System V			SED(C)

     Name
	  sed - Invokes the stream editor.

     Syntax
	  sed [ -n ] [ -e script ] [ -f sfile ] [ files ]

     Description
	  sed copies the named files (standard input default) to the
	  standard output, edited according to a script of commands.
	  The -e option causes the script to be read literally from
	  the next argument, which is usually quoted to protect it
	  from the shell.  The -f option causes the script to be taken
	  from file sfile; these options accumulate.  If there is just
	  one -e option and no -f options, the flag -e may be omitted.
	  The -n option suppresses the default output.	A script
	  consists of editing commands, one per line, of the following
	  form:

	       [ address [ , address ] ] function [ arguments ]

	  In normal operation, sed cyclically copies a line of input
	  into a pattern space (unless there is something left after a
	  D command), applies in sequence all commands whose addresses
	  select that pattern space, and at the end of the script
	  copies the pattern space to the standard output (except
	  under -n) and deletes the pattern space.

	  A semicolon (;) can be used as a command delimiter.

	  Some of the commands use a hold space to save all or part of
	  the pattern space for subsequent retrieval.

	  An address is either a decimal number that counts input
	  lines cumulatively across files, a $ that addresses the last
	  line of input, or a context address, i.e., a /regular
	  expression/ in the style of ed(C) modified as follows:

	  -    In a context address, the construction \?regular
	       expression?, where ?  is any character, is identical to
	       /regular expression/.  Note that in the context address
	       \xabc\xdefx, the second x stands for itself, so that
	       the regular expression is abcxdef.

	  -    The escape sequence \n matches a newline embedded in
	       the pattern space.

	  -    A period . matches any character except the terminal
	       newline of the pattern space.

	  -    A command line with no addresses selects every pattern
	       space.

     Page 1					      (printed 2/7/91)

     SED(C)		      XENIX System V			SED(C)

	  -    A command line with one address selects each pattern
	       space that matches the address.

	  -    A command line with two addresses separated by a comma
	       selects the inclusive range from the first pattern
	       space that matches the first address through the next
	       pattern space that matches the second.  (If the second
	       address is a number less than or equal to the line
	       number first selected, only one line is selected.)
	       Thereafter, the process is repeated, looking again for
	       the first address.

	  Editing commands can be applied only to nonselected pattern
	  spaces by use of the negation function ! (below).

	  In the following list of functions, the maximum number of
	  permissible addresses for each function is indicated in
	  parentheses.

	  The text argument consists of one or more lines, all but the
	  last of which end with backslashes to hide the newlines.
	  Backslashes in text are treated like backslashes in the
	  replacement string of an s command, and may be used to
	  protect initial blanks and tabs against the stripping that
	  is done on every script line.	 The rfile or wfile argument
	  must terminate the command line and must be preceded by
	  exactly one blank.  Each wfile is created before processing
	  begins.  There can be at most 10 distinct wfile arguments.

	  (1)a\
	  text	    Appends text, placing it on the output before
		    reading the next input line.

	  (2)b label
		    Branches to the : command bearing the label.  If
		    label is empty, branches to the end of the script.

	  (2)c\
	  text	    Changes text by deleting the pattern space and
		    then appending text. With 0 or 1 address or at the
		    end of a 2-address range, places text on the
		    output and starts the next cycle.

	  (2)d	    Deletes the pattern space and starts the next
		    cycle.

	  (2)D	    Deletes the initial segment of the pattern space
		    through the first newline and starts the next
		    cycle.

	  (2)g	    Replaces the contents of the pattern space with
		    the contents of the hold space.

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     SED(C)		      XENIX System V			SED(C)

	  (2)G	    Appends the contents of the hold space to the
		    pattern space.

	  (2)h	    Replaces the contents of the hold space with the
		    contents of the pattern space.

	  (2)H	    Appends the contents of the pattern space to the
		    hold space.

	  (1)i\
	  text	    Insert.  Places text on the standard output.

	  (2)l	    Lists the pattern space on the standard output
		    with nonprinting characters spelled in two-digit
		    ASCII and long lines folded.

	  (2)n	    Copies the pattern space to the standard output.
		    Replaces the pattern space with the next line of
		    input.

	  (2)N	    Appends the next line of input to the pattern
		    space with an embedded newline.  (The current line
		    number changes.)

	  (2)p	    Prints (copies) the pattern space on the standard
		    output.

	  (2)P	    Prints (copies) the initial segment of the pattern
		    space through the first newline to the standard
		    output.

	  (1)q	    Quits sed by branching to the end of the script.
		    No new cycle is started.

	  (2)r rfile
		    Reads the contents of rfile and places them on the
		    output before reading the next input line.

	  (2)s/regular expression/replacement/flags
		    Substitutes the replacement string for instances
		    of the regular expression in the pattern space.
		    Any character may be used instead of /.  For a
		    more detailed description, see ed(C).  Flags is
		    zero or more of:

		    n	 n=1-512.  Substitute for just the nth
			 occurrence of the regular expression.

		    g	 Globally substitutes for all nonoverlapping
			 instances of the regular expression rather
			 than just the first one.

     Page 3					      (printed 2/7/91)

     SED(C)		      XENIX System V			SED(C)

		    p	 Prints the pattern space if a replacement was
			 made.

		    w wfile
			 Writes the pattern space to wfile if a
			 replacement was made.

	  (2)t label
		    Branches to the colon (:)  command bearing label
		    if any substitutions have been made since the most
		    recent reading of an input line or execution of a
		    t command.	If label is empty, t branches to the
		    end of the script.

	  (2)w wfile
		    Writes the pattern space to wfile.

	  (2)x	    Exchanges the contents of the pattern and hold
		    spaces.

	  (2)y/string1/string2/
		    Replaces all occurrences of characters in string1
		    with the corresponding characters in string2.  The
		    lengths of string1 and string2 must be equal.

	  (2)! function
		    Applies the function (or group, if function is {)
		    only to lines not selected by the address(es).

	  (0): label
		    This command does nothing; it bears a label for b
		    and t commands to branch to.

	  (1)=	    Places the current line number on the standard
		    output as a line.

	  (2){	    Executes the following commands through a matching
		    } only when the pattern space is selected.

	  (0)	    An empty command is ignored.

     See Also
	  awk(C), ed(C), grep(C)

     Notes
	  This command is explained in detail in XENIX Text Processing
	  Guide.

     Page 4					      (printed 2/7/91)

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