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 pg(1)								       pg(1)

      pg - file perusal filter for soft-copy terminals

      pg [-number] [-pstring] [-cefnrs] [+linenumber] [+/pattern] [file ...]

      pg and more are both used in similar situations (see more(1)).  Text
      highlighting features supported by more are not available from pg.
      However, pg has some useful features not provided by more.

      pg is a text file filter that allows the examination of files one
      screenful at a time on a soft-copy terminal.  If - is used as a file
      argument, or pg detects NULL arguments in the comand line, the
      standard input is used.  Each screenful is followed by a prompt.	To
      display a new page, press Return.	 Other possibilities are enumerated

      This command is different from other paginators such as more in that
      it can back up for reviewing something that has already passed.  The
      method for doing this is explained below.

      In order to determine terminal attributes, pg scans the terminfo data
      base for the terminal type specified by the environment variable TERM
      (see terminfo(4)).  If TERM is not defined, terminal type dumb is

      pg recognizes the following command line options:

	   -number	  number is an integer specifying the size (in
			  lines) of the window that pg is to use instead of
			  the default (on a terminal containing 24 lines,
			  the default window size is 23).

	   -p string	  Causes pg to use string as the prompt.  If the
			  prompt string contains a %d, the first occurrence
			  of %d in the prompt is replaced by the current
			  page number when the prompt is issued.  The
			  default prompt string is a colon (:).

	   -c		  Home the cursor and clear the screen before
			  displaying each page.	 This option is ignored if
			  clear_screen is not defined in the terminfo data
			  base for this terminal type.

	   -e		  Causes pg to not pause at the end of each file.

	   -f		  Normally, pg splits lines longer than the screen
			  width, but some sequences of characters in the

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 pg(1)								       pg(1)

			  text being displayed (such as escape sequences for
			  underlining) generate undesirable results.  The -f
			  option inhibits pg from splitting lines.

	   -n		  Normally, commands must be terminated by a new-
			  line character.  This option causes an automatic
			  end-of-command as soon as a command letter is

	   -r		  Restricted mode.  The shell escape is disallowed.
			  pg will print an error message but does not exit.

	   -s		  Causes pg to print all messages and prompts in
			  standout mode (usually inverse video).

	   +linenumber	  Start display at linenumber.

	   +/pattern/	  Start up at the first line containing text that
			  matches the regular expression pattern.

      pg looks in the environment variable PG to preset any flags desired.
      For example, if you prefer to view files using the -c mode of
      operation, the Bourne-shell command sequence PG='-c' ; export PG or
      the C-shell command setenv PG -c causes all invocations of pg,
      including invocations by programs such as man and msgs, to use this
      mode.  The command sequence to set up the PG environment variable is
      normally placed in the user .profile or .cshrc file. No form of
      quoting is provided, so the string and pattern arguments are limited
      to single word.

      The responses that can be typed when pg pauses can be divided into
      three categories: those causing further perusal, those that search,
      and those that modify the perusal environment.

      Commands that cause further perusal normally take a preceding address,
      an optionally signed number indicating the point from which further
      text should be displayed.	 This address is interpreted either in pages
      or lines, depending on the command.  A signed address specifies a
      point relative to the current page or line; an unsigned address
      specifies an address relative to the beginning of the file.  Each
      command has a default address that is used if none is provided.

      Perusal commands and their defaults are as follows:

	   (+1)<newline> or <blank>
			  Displays one page.  The address is specified in

	   (+1) l	  With a relative address, pg simulates scrolling
			  the screen, forward or backward, the number of
			  lines specified.  With an absolute address pg

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 pg(1)								       pg(1)

			  prints a screenful beginning at the specified

	   (+1) d or ^D	  Simulates scrolling a half-screen forward or

	   if		  Skip i screens of text.

	   iz		  Same as newline except that i , if present,
			  becomes the new default number of lines per

      The following perusal commands take no address:

	   . or ^L	  Typing a single period causes the current page of
			  text to be redisplayed.

	   $		  Displays the last windowful in the file.  Use with
			  caution when the input is a pipe.

      The following commands are available for searching for text patterns
      in the text.  The Basic Regular Expression syntax (see regexp(5)) is
      supported. The terminal /, ^, or ?  can be omitted from the pattern
      search commands.	Regular expressions must always be terminated by a
      new-line character, even if the -n option is specified.

	   i/pattern/	  Search forward for the ith (default i=1)
			  occurrence of pattern.  Searching begins
			  immediately after the current page and continues
			  to the end of the current file, without wrap-

	   i?pattern?	  Search backwards for the ith (default i=1)
			  occurrence of pattern.  Searching begins
			  immediately before the current page and continues
			  to the beginning of the current file, without
			  wrap-around.	The ^ notation is useful for Adds
			  100 terminals which cannot properly handle the ?.

      After searching, pg normally displays the line found at the top of the
      screen.  This can be modified by appending m or b to the search
      command to leave the line found in the middle or at the bottom of the
      window from now on.  The suffix t can be used to restore the original

      pg users can modify the perusal environment with the following

	   in		  Begin perusing the ith next file in the command
			  line.	 The i is an unsigned number, default value

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 pg(1)								       pg(1)

			  is 1.

	   ip		  Begin perusing the ith previous file in the
			  command line.	 i is an unsigned number, default is

	   iw		  Display another window of text.  If i is present,
			  set the window size to i.

	   s filename	  Save the input in the named file.  Only the
			  current file being perused is saved.	The white
			  space between the s and filename is optional.
			  This command must always be terminated by a new-
			  line character, even if the -n option is

	   h		  Help by displaying an abbreviated summary of
			  available commands.

	   q or Q	  Quit pg.

	   !command	  command is passed to the shell, whose name is
			  taken from the SHELL environment variable.  If
			  this is not available, the default shell is used.
			  This command must always be terminated by a new-
			  line character, even if the -n option is

      At any time when the output is being sent to the terminal, the user
      can press the quit key (normally CTRL-\), the interrupt (break) key or
      the DEL key. This causes pg to stop sending output, and display the
      prompt. The user may then enter one of the commands in the normal
      manner.  Unfortunately, some output is lost when this is done, due to
      the fact that any characters waiting in the terminal's output queue
      are flushed when the quit signal occurs.

      If the standard output is not a terminal, pg is functionally
      equivalent to cat (see cat(1)), except that a header is printed before
      each file if more than one file is specified.

    Environment Variables
      LC_COLLATE determines the collating sequence used in evaluating
      regular expressions.

      LC_CTYPE determines the interpretation of text as single and/or
      multi-byte characters, and the characters matched by character class
      expressions in regular expressions.

      LANG determines the language in which messages are displayed.

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 pg(1)								       pg(1)

      If LC_COLLATE or LC_CTYPE is not specified in the environment or is
      set to the empty string, the value of LANG is used as a default for
      each unspecified or empty variable.  If LANG is not specified or is
      set to the empty string, a default of "C" (see lang(5)) is used
      instead of LANG.	If any internationalization variable contains an
      invalid setting, pg behaves as if all internationalization variables
      are set to "C".  See environ(5).

    International Code Set Support
      Single- and multi-byte character code sets are supported.

      To use pg when reading system news:

	   news | pg -p "(Page %d):"

      If terminal tabs are not set every eight positions, undesirable
      results may occur.

      When using pg as a filter with another command that changes the
      terminal I/O options (such as crypt(1)), terminal settings may not be
      restored correctly.

      While waiting for terminal input, pg responds to BREAK, DEL, and ^ by
      terminating execution.  Between prompts, however, these signals
      interrupt pg's current task and place the user in prompt mode.  These
      should be used with caution when input is being read from a pipe,
      because an interrupt is likely to terminate the other commands in the

      Users of more will find that the z and f commands are available, and
      that the terminal /, ^, or ? can be omitted from the pattern search

      /usr/share/lib/terminfo/?/*	      terminal information data base
      /tmp/pg*				      temporary file when input is
					      from a pipe

      crypt(1), grep(1), more(1), terminfo(4), environ(5), lang(5),

      pg: SVID2, SVID3, XPG2, XPG3

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