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PG (1)

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pg - file perusal filter for CRTs

CONTENTS

Synopsis
Description
Environment Variables
See Also
Notes

pg [-number] [-p string] [-cefnrs] [+line] [+/pattern/] [file . . .]

Pg displays a text file on a CRT one screenful at once. After each page, a prompt is displayed. The user may then either press the newline key to view the next page or one of the keys described below.

If no filename is given on the command line, pg reads from standard input. If the standard output is not a terminal, pg acts like cat(1) but precedes each file with its name if there is more than one.

If input comes from a pipe, pg stores the data in a buffer file while reading to make navigation possible.

Pg accepts the following options:

-number	The number of lines per page. Usually, this is the number of CRT lines minus one.
-c	Clear the screen before a page is displayed if the terminfo entry for the terminal provides this capability.
-e	pg will not pause and display (EOF) at the end of a file.
-f	pg does not split long lines.
-n	Without this option, commands must be terminated by a newline character. With this option, pg advances once a command letter is entered.
-p string	Instead of the prompt : , string is displayed. If string contains %d , its first occurrence is replaced by the number of the current page.
-r	Disallow the shell escape.
-s	Print messages in standout mode if the terminfo entry for the terminal provides this capability.
+number
	Start at the given line.
+/pattern/
	Start at the line containing the regular expression pattern given.
The following commands may be entered at the prompt. Commands preceded by i in this document accept a number as argument, positive or negative. If this argument starts with + or -, it is interpreted relative to the current position in the input file, otherwise relative to the beginning.
i<newline>
	Display the next or the indicated page.
id or ^D
	Display the next halfpage. If i is given, it is always interpreted relative to the current position.
il	Display the next or the indicated line.
if	Skip a page forward. i must be a positive number and is always interpreted relative to the current position.
iw or iz
	Behave as <newline> except that i becomes the new page size.
. or ^L
	Redraw the screen.
$	Advance to the last line of the input file.
i/pattern/
	Search forward until the first or the i-th occurrence of the regular expression pattern is found. The search starts after the current page and stops at the end of the file. No wrap-around is performed. i must be a positive number.
i?pattern? or i^pattern^
	Search backward until the first or the i-th occurrence of the regular expression pattern is found. The search starts before the current page and stops at the beginning of the file. No wrap-around is performed. i must be a positive number.
The search commands accept an added letter. If t is given, the line containing the pattern is displayed at the top of the screen, which is the default. m selects the middle and b the bottom of the screen. The selected position is used in following searches, too.
in	Advance to the next file or i files forward.
ip	Reread the previous file or i files backward.
s filename
	Save the current file to the given filename.
h	Display a command summary.
!command
	Execute command using the shell.
q or Q
	Quit.

If the user presses the interrupt or quit key while pg reads from the input file or writes on the terminal, pg will immediately display the prompt. In all other situations these keys will terminate pg.

Pg uses limited regular expressions as described in ed(1). /usr/5bin/pg uses simple regular expressions, /usr/5bin/s42/pg, /usr/5bin/posix/pg, and /usr/5bin/posix2001/pg use basic regular expressions.

The following environment variables affect the behavior of pg:

COLUMNS
	Overrides the system-supplied number of columns if set.
LANG, LC_ALL
	See locale(7).
LC_COLLATE
	Affects the collation order for range expressions, equivalence classes, and collation symbols in basic regular expressions.
LC_CTYPE
	Determines the mapping of bytes to characters, whether a character is printable, and the availability and composition of character classes in basic regular expressions.
LINES	Overrides the system-supplied number of lines if set.
SHELL	Used by the ! command.
TERM	Determines the terminal type.

cat(1), ed(1), more(1), sh(1), terminfo(5), locale(7), regex(7), term(7)

Pg expects the terminal tabulators to set on eight positions.

Pg contains limited support for terminal escape sequences in its input, e.g. it is possible to view text in color and boldface as with ''lc | pg''. Sequences that affect more than one output line are not supported, though.