Annotation of src/usr.bin/less/more.1, Revision 1.1
1.1 ! millert 1: .\" $OpenBSD$
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! 10: .\" notice, this list of conditions and the following disclaimer.
! 11: .\" 2. Redistributions in binary form must reproduce the above copyright
! 12: .\" notice, this list of conditions and the following disclaimer in the
! 13: .\" documentation and/or other materials provided with the distribution.
! 14: .\" 3. Neither the name of the University nor the names of its contributors
! 15: .\" may be used to endorse or promote products derived from this software
! 16: .\" without specific prior written permission.
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! 18: .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 19: .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 20: .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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! 30: .\" @(#)more.1 8.2 (Berkeley) 4/18/94
! 31: .\"
! 32: .Dd $Mdocdate$
! 33: .Dt MORE 1
! 34: .Os
! 35: .Sh NAME
! 36: .Nm more
! 37: .Nd file perusal filter for crt viewing
! 38: .Sh SYNOPSIS
! 39: .Nm more
! 40: .Op Fl ceisu
! 41: .Op Fl n Ar number
! 42: .Op Fl p Ar command
! 43: .Op Fl t Ar tag
! 44: .Op Ar
! 45: .Sh DESCRIPTION
! 46: .Nm more
! 47: is a filter for paging through text one screenful at a time.
! 48: It uses
! 49: .Xr terminfo 3
! 50: so it can run on a variety of terminals.
! 51: There is even limited support for hardcopy terminals.
! 52: (On a hardcopy terminal, lines which should be
! 53: printed at the top of the screen are prefixed with an up-arrow.)
! 54: If no
! 55: .Ar file
! 56: is specified, or if
! 57: .Ar file
! 58: is a single dash
! 59: .Pq Ql - ,
! 60: the standard input is used.
! 61: .Pp
! 62: The options are as follows:
! 63: .Bl -tag -width Ds
! 64: .It Fl c
! 65: Normally,
! 66: .Nm
! 67: will repaint the screen by scrolling from the bottom of the screen.
! 68: If the
! 69: .Fl c
! 70: option is set, when
! 71: .Nm
! 72: needs to change the entire display, it will paint from the top line down.
! 73: .It Fl e
! 74: Normally, if displaying a single file,
! 75: .Nm
! 76: exits as soon as it reaches end-of-file.
! 77: The
! 78: .Fl e
! 79: option tells more to
! 80: exit if it reaches end-of-file twice without an intervening operation.
! 81: If the file is shorter than a single screen
! 82: .Nm
! 83: will exit at end-of-file regardless.
! 84: .It Fl i
! 85: The
! 86: .Fl i
! 87: option causes searches to ignore case; that is,
! 88: uppercase and lowercase are considered identical.
! 89: .It Fl n Ar number
! 90: The
! 91: .Fl n
! 92: option causes
! 93: .Nm
! 94: to page
! 95: .Ar number
! 96: of lines per screenful.
! 97: By default,
! 98: .Nm
! 99: will use the terminal window size.
! 100: .It Fl p Ar command
! 101: Execute the specified
! 102: .Nm
! 103: .Ar command
! 104: when the file is first opened.
! 105: .It Fl s
! 106: The
! 107: .Fl s
! 108: option causes
! 109: consecutive blank lines to be squeezed into a single blank line.
! 110: .It Fl t
! 111: The
! 112: .Fl t
! 113: option, followed immediately by a tag, will edit the file
! 114: containing that tag.
! 115: For more information, see the
! 116: .Xr ctags 1
! 117: command.
! 118: .It Fl u
! 119: By default,
! 120: .Nm
! 121: treats backspaces and
! 122: .Dv CR-LF
! 123: sequences specially.
! 124: Backspaces which appear adjacent to an underscore character are
! 125: displayed as underlined text.
! 126: Backspaces which appear between two identical characters are displayed
! 127: as emboldened text.
! 128: .Dv CR-LF
! 129: sequences are compressed to a single linefeed
! 130: character.
! 131: The
! 132: .Fl u
! 133: option causes backspaces to always be displayed as
! 134: control characters, i.e. as the two character sequence
! 135: .Sq ^H ,
! 136: and
! 137: .Dv CR-LF
! 138: to be left alone.
! 139: .Sh COMMANDS
! 140: Interactive commands for
! 141: .Nm
! 142: are based on
! 143: .Xr vi 1 .
! 144: Some commands may be preceded by a decimal number, called N in the
! 145: descriptions below.
! 146: In the following descriptions, ^X means control-X.
! 147: .Pp
! 148: .Bl -tag -width Ic
! 149: .It Ic h
! 150: Help: display a summary of these commands.
! 151: If you forget all the other commands, remember this one.
! 152: .It Xo
! 153: .Ic SPACE
! 154: .No or
! 155: .Ic f
! 156: .No or
! 157: .Ic \&^F
! 158: .Xc
! 159: Scroll forward N lines, default one window.
! 160: If N is more than the screen size, only the final screenful is displayed.
! 161: .It Ic b No or Ic \&^B
! 162: Scroll backward N lines, default one window (see option -z below).
! 163: If N is more than the screen size, only the final screenful is displayed.
! 164: .It Ic j No or Ic RETURN
! 165: Scroll forward N lines, default 1.
! 166: The entire N lines are displayed, even if N is more than the screen size.
! 167: .It Ic k
! 168: Scroll backward N lines, default 1.
! 169: The entire N lines are displayed, even if N is more than the screen size.
! 170: .It Ic d No or Ic \&^D
! 171: Scroll forward N lines, default one half of the screen size.
! 172: If N is specified, it becomes the new default for
! 173: subsequent d and u commands.
! 174: .It Ic u No or Ic \&^U
! 175: Scroll backward N lines, default one half of the screen size.
! 176: If N is specified, it becomes the new default for
! 177: subsequent d and u commands.
! 178: .It Ic g
! 179: Go to line N in the file, default 1 (beginning of file).
! 180: .It Ic G
! 181: Go to line N in the file, default the end of the file.
! 182: .It Ic p No or Ic \&%
! 183: Go to a position N percent into the file.
! 184: N should be between 0 and 100.
! 185: (This works if standard input is being read, but only if
! 186: .Nm
! 187: has already read to the end of the file.
! 188: It is always fast, but not always useful.)
! 189: .It Ic r No or Ic \&^L
! 190: Repaint the screen.
! 191: .It Ic R
! 192: Repaint the screen, discarding any buffered input.
! 193: Useful if the file is changing while it is being viewed.
! 194: .It Ic m
! 195: Followed by any lowercase letter,
! 196: marks the current position with that letter.
! 197: .It Ic \&'
! 198: (Single quote.)
! 199: Followed by any lowercase letter, returns to the position which
! 200: was previously marked with that letter.
! 201: Followed by another single quote, returns to the position at
! 202: which the last "large" movement command was executed, or the
! 203: beginning of the file if no such movements have occurred.
! 204: All marks are lost when a new file is examined.
! 205: .It Ic \&/ Ns Ar pattern
! 206: Search forward in the file for the N-th line containing the pattern.
! 207: N defaults to 1.
! 208: The pattern is a regular expression, as recognized by
! 209: .Xr ed .
! 210: The search starts at the second line displayed.
! 211: .It Ic \&? Ns Ar pattern
! 212: Search backward in the file for the N-th line containing the pattern.
! 213: The search starts at the line immediately before the top line displayed.
! 214: .It Ic \&/\&! Ns Ar pattern
! 215: Like /, but the search is for the N-th line
! 216: which does NOT contain the pattern.
! 217: .It Ic \&?\&! Ns Ar pattern
! 218: Like ?, but the search is for the N-th line
! 219: which does NOT contain the pattern.
! 220: .It Ic n
! 221: Repeat previous search, for N-th line containing the last pattern
! 222: (or
! 223: .Tn NOT
! 224: containing the last pattern, if the previous search
! 225: was /! or ?!).
! 226: .It Ic N
! 227: Repeat previous search in the opposite direction,
! 228: for N-th line containing the last pattern (or
! 229: .Tn NOT
! 230: containing the last pattern, if the previous search
! 231: was /! or ?!).
! 232: .It Ic E Ns Op Ar filename
! 233: Examine a new file.
! 234: If the filename is missing, the "current" file (see the N and P commands
! 235: below) from the list of files in the command line is re-examined.
! 236: If the filename is a pound sign (#), the previously examined file is
! 237: re-examined.
! 238: .It Ic \&:n
! 239: Examine the next file (from the list of files given in the command line).
! 240: If a number N is specified (not to be confused with the command N),
! 241: the N-th next file is examined.
! 242: .It Ic P No or Ic \&:p
! 243: Examine the previous file.
! 244: If a number N is specified, the N-th previous file is examined.
! 245: .It Ic \&:t
! 246: Go to supplied tag.
! 247: .It Ic v
! 248: Invokes an editor to edit the current file being viewed.
! 249: The editor is taken from the environment variable
! 250: .Ev EDITOR ,
! 251: or defaults to
! 252: .Xr vi 1 .
! 253: .It Ic \&= No or Ic \&^G
! 254: These options print out the number of the file currently being displayed
! 255: relative to the total number of files there are to display, the current
! 256: line number, the current byte number and the total bytes to display, and
! 257: what percentage of the file has been displayed.
! 258: If
! 259: .Nm
! 260: is reading from the standard input,
! 261: or the file is shorter than a single screen, some
! 262: of these items may not be available.
! 263: Note, all of these items reference the first byte of the last line
! 264: displayed on the screen.
! 265: .It Xo
! 266: .Ic q
! 267: .No or
! 268: .Ic \&:q
! 269: .No or
! 270: .Ic ZZ
! 271: .Xc
! 272: Exits
! 273: .Nm .
! 274: .El
! 275: .Sh ENVIRONMENT
! 276: .Nm
! 277: utilizes the following environment variables, if they exist:
! 278: .Bl -tag -width Fl
! 279: .It Ev EDITOR
! 280: The default editor if
! 281: .Ev VISUAL
! 282: is not set.
! 283: If neither
! 284: .Ev VISUAL
! 285: nor
! 286: .Ev EDITOR
! 287: are set,
! 288: .Xr vi 1
! 289: is used.
! 290: .It Ev MORE
! 291: Default command line options to use with
! 292: .Nm .
! 293: The options should be space-separated and must be prefixed with a dash
! 294: .Pq Ql - .
! 295: .It Ev SHELL
! 296: Current shell in use (normally set by the shell at login time).
! 297: .It Ev TERM
! 298: Specifies terminal type, used by more to get the terminal
! 299: characteristics necessary to manipulate the screen.
! 300: .It Ev VISUAL
! 301: Specify default editor.
! 302: .El
! 303: .Sh SEE ALSO
! 304: .Xr ctags 1 ,
! 305: .Xr less 1 ,
! 306: .Xr vi 1
! 307: .Sh STANDARDS
! 308: The
! 309: .Nm
! 310: utility is compliant with the
! 311: .St -p1003.1-2008
! 312: specification,
! 313: though its presence is optional.
! 314: .Pp
! 315: This version of the
! 316: .Nm
! 317: utility is actually
! 318: .Xr less 1
! 319: in disguise.
! 320: As such, it will also accept options documented in
! 321: .Xr less 1 .
! 322: .Pp
! 323: Behavior for the
! 324: .Fl e
! 325: and
! 326: .Fl p
! 327: flags differs between this implementation and
! 328: .St -p1003.1-2008 .
! 329: The
! 330: .Sq s
! 331: command also has a different meaning.
! 332: .Sh AUTHORS
! 333: .An Mark Nudelman Aq Mt markn@greenwoodsoftware.com
! 334: .Sh HISTORY
! 335: A
! 336: .Nm
! 337: command appeared in
! 338: .Bx 3.0 .
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