BVI(1) User Commands BVI(1) NAME bvi, bview - visual display editor for binary files VERSION bvi-1.2.0 SYNOPSIS bvi [-R] [-c cmd] [-f script] file... bview [-R] [-c cmd] [-f script] file... OPTIONS file... One or more files. The file argument indicates one or more files to be edited. -R "Readonly": The readonly flag is set for all the files, preventing accidental overwriting with a write command. -c cmd Execute command cmd. Begin editing by executing the specified editor command (usually a search or positioning command). -f script This command provides a means for collecting a series of "ex" (colon) commands into a script file, then using this file to edit other files. Since there is no binary stream editor "bsed", you can use this option to make several global changes in a binary file. DESCRIPTION Bvi stands for "Binary VIsual editor". Bvi is a display oriented editor for binary files; its command set is based on those of the vi(1) texteditor. As a binary editor cannot have the concept of "lines" there are several differences to Vi commands (see COMPARISON). COMPARISON The main differences between Vi and Bvi are: The screen is divided in three sections/windows: The byte offset (at the left side), the hex window (in the middle), and the ascii window (to the right) which shows the ascii values of those bytes in the hex window. On an 80 column terminal you will therefore see sixteen hex values and their ASCII values on each screen line. Note that the first byte has the offset '0' (zero). You can toggle between the hex and ascii windows with the tabulator key (TAB). Toggling between these two windows does not change the current position within the file. No "lines" concept: Files are treated as one long series of bytes only. These characters "newline" and "carriage return" thus are not special, ie they do not mark the end of lines. Therefore the lines on the screen do not represent lines in the usual way. Data is broken across screen lines as they happen to fit in. As a consequence there are no commands in bvi from ex or vi that are based on line numbers, eg "dd", "yy", 'C', 'S', 'o', 'O'. This also changes the meaning of "range" before the ":write" command to a byte offset, ie the command ":100,200w foo" writes all *bytes* (not lines) from offset 100 to offset 200 to the file "foo". No "text objects": There are also no text-specific arrangements like words, paragraphs, sentences, sections and so on. Extended "ruler": The bottom line of the screen shows the current address (byte offset) and the current character in these notations: octal, hexadecimal, decimal and ascii. Search patterns: All search commands understand these special characters: . any character [] set of characters * zero or more occurrences of previous char or set But as there is no concept of lines you cannot use the standard symbols ("anchors") for "begin-of-line" ('^') and "end-of-line" ('$'). Searching for the start/end of lines must be done explicitly by adding these special characters to your search pattern using these meta sequences: \n newline \r return \t tab \0 binary zero Additional search commands: Similar to the text search commands there are additional hex-search functions '\' and '#' which allow to search for any byte value. Example: "\62 76 69" will search for the string "bvi". Spaces between hex value are optional, so searching for "6775636B6573" will find "guckes". Changing data (insertion, deletion) moves the data to other addresses; this is bad for many cases (eg. databases, program files) and is thus disabled by default. You can enable this commands by typing :set memmove BVI Modes: Command Mode aka Normal Mode: Input is treated as commands. Note that command mode is the default mode after startup and when you escape/quit from either command line mode or input mode. Use ESC (escape) to cancel a partial (uncompleted) command. Input Mode: Input is treated as replacement of current character or is appended to the current file. This mode is entered from command mode by typing either of 'i', 'I', 'A', 'r', or 'R'. You can enter the character itself (in the ASCII window) or its hexadecimal value (in the HEX window). Type TAB to switch between these two windows. Type ESC to cancel current command and return to command mode. Type CTRL-C to cancel current command abnormally. Command line mode (aka Last Line Mode): Reading input for : / ? \ # or !; terminate by typing a carriage return; an interrupt cancels termination. Type ESC to cancel current command and return to command mode. ENVIRONMENT The editor recognizes the environment variable BVIINIT as a command (or list of commands) to run when it starts up. If this variable is undefined, the editor checks for startup commands in the file ~/.bvirc file, which you must own. However, if there is a .bvirc owned by you in the current directory, the editor takes its startup commands from this file - overriding both the file in your home directory and the environment variable. TERMINOLOGY Characters names are abbreviated as follows: Abbr. ASCII name aka CR 010 carriage return ^A 001 control-a ^H 008 control-h ^I 009 control-i aka TAB ^U 021 control-u ^Z 026 control-z ESC 027 escape aka ESC DEL 127 delete LEFT --- left arrow RIGHT --- right arrow DOWN --- down arrow UP --- up arrow COMMAND SUMMARY See the TERMINOLOGY for a summary on key name abbreviations used within the following description of commands. Abstract: Arrow keys move the cursor on the screen within the current window. Sample commands: :version show version info <- v ^ -> arrow keys move the cursor h j k l same as arrow keys u undo previous change ZZ exit bvi, saving changes :q! quit, discarding changes /text search for text ^U ^D scroll up or down Counts before bvi commands: Numbers may be typed as a prefix to some commands. They are interpreted in one of these ways. screen column | byte of file G scroll amount ^D ^U repeat effect most of the rest Interrupting, canceling ESC end insert or incomplete command DEL (delete or rubout) interrupts File manipulation: ZZ if file modified, write and exit; otherwise, exit :w write changed buffer to file :w! write changed buffer to file, overriding read-only ("forced" write) :q quit when no changes have been made :q! quit and discard all changes :e file edit file :e! reedit current file, discard all changes :e # edit the alternate file :e! # edit the alternate file, discard changes :w file write current buffer to file :w! file write current buffer to file overriding read-only (this "overwrites" the file) :sh run the command as set with option "shell", then return :!cmd run the command cmd from "shell", then return :n edit next file in the argument list :f show current filename, modified flag, current byte offset, and percentage of current position within buffer ^G same as :f Additional edit commands You can insert/append/change bytes in ASCII/binary/decimal/ hexadecimal or octal representation. You can enter several (screen) lines of input. A line with only a period (.) in it will terminate the command. You must not type in values greater than a byte value. This causes an abandom of the command. Pressing the CR key does not insert a newline - character into the file. If you use ASCII mode you can use the special characters \n, \r, \t and \0. :i aCR insert bytes (ASCII) at cursor position :a bCR append bytes (Binary) at end of file :c hCR change bytes (hexadecimal) at cursor position Bit-level operations :and n bitwise 'and' operation with value n :or n bitwise 'or' operation with value n :xor n bitwise 'xor' operation with value n :neg two's complement :not logical negation :sl i shift each byte i bits to the left :sr i shift each byte i bits to the right :rl i rotate each byte i bits to the left :rr i rotate each byte i bits to the right Command mode addresses :w foo write current buffer to a file named "foo" :5,10w foo copy byte 5 through 100 into as file named foo :.,.+20w foo copy the current byte and the next 20 bytes to foo :^,'aw foo write all bytes from the beginning through marker 'a' :/pat/,$ foo search pattern pat and and copy through end of file Positioning within file: ^B backward screen ^F forward screen ^D scroll down half screen ^U scroll up half screen nG go to the specified character (end default), where n is a decimal address /pat next line matching pat ?pat previous line matching pat \hex jump to next occurrence of hex string hex #hex jump to previous occurrence of hex string hex n repeat last search command N repeat last search command, but in opposite direction Adjusting the screen: ^L clear and redraw screen zCR redraw screen with current line at top of screen z- redraw screen with current line at bottom of screen z. redraw screen with current line at center of screen /pat/z- search for pattern pat and then move currents line to bottom ^E scroll screen down 1 line ^Y scroll screen up 1 line Marking and returning: mx mark current position with lower-case letter x Note: this command works for all lower-case letters 'x move cursor to mark x in ASCII section `x move cursor to mark x in HEX section '' move cursor to previous context in ASCII section `` move cursor to previous context in HEX section Line positioning: H jump to first line on screen ("top") L jump to last line on screen ("low") M jump to middle line on screen ("middle") - jump onto previous line on screen + jump onto next line on screen CR same as + DOWN or j next line, same column UP or k previous line, same column Character positioning: ^ first byte in HEX window $ end of screen line l or RIGHT jump onto next byte (within current screen line) h or LEFT jump onto previous byte (within current screen line) ^H same as LEFT space same as RIGHT fx find next occurrence of character x Fx find previous occurrence of character x n| jump onto nth byte/character within current line Strings: (works similar to the strings(1) command) Note: "Words" are defined as strings of "nonprinting characters". e jump to next end of word w jump to next begin of word b jump to previous begin of word W forward to next string delimited with a \0 or \n B back to previous string delimited with a nonprinting char Corrections during insert: ^H erase last character (backspace) erase your erase character, same as ^H (backspace) ESC ends insertion, back to command mode Append and replace: A append at end of file rx replace current bte with char 'x' R enter replace mode; for all subsequent input, the current byte is overwritten with the next input character; leave replace mode with ESC. Miscellaneous Operations: TAB toggle between ASCII and HEX section Yank and Put: 3ySPACE yank 3 characters p insert contents of yank buffer o replace text with content of yank buffer P put back at end of file Undo, Redo: u undo last change Note: Only the last change can be undone. Therefore this commands toggles between the last and second-t-last state of the buffer. Setting Options: With the :set command you can set options in bvi Option Default Description autowrite noaw Save current file, if modified, if you give a :n, :r or ! command columns cm=16 on an 80 character wide terminal ignorecase noic Ignores letter case in searching magic nomagic Makes . [ * special in patterns memmove nomm enables insert and delete commands offset of=0 adds an offset to the diplayed addresses readonly noro If set, write fails unless you use ! after command scroll sc=1/2 window Number of lines scrolled by ^U and ^D showmode mo Displays statusline on bottom of the screen terse noterse Let you obtain shorter error messages window window=screensize Lines in window, can be reduced at slow terminals wordlength wl=4 Length of an ASCII-string found by w, W, b or B wrapscan ws Searches wrap around past the end of the file unixstyle nous The representation of ascii characters below 32 is displayed in the statusline as shown in ascii(7) if unset rather in DOS-style (^A) AUTHOR bvi was developed by Gerhard Buergmann, Vienna, Austria Gerhard.Buergmann@altavista.net WWW Bvi Homepage: http://bvi.linuxave.net/ Vi Pages: http://www.math.fu-berlin.de/~guckes/vi/ (all about Vi and its clones) FILES $HOME/.bvirc editor startup file ./.bvirc editor startup file BUGS Bvi does not update the screen when the terminal changes its size. SEE ALSO vi(1), strings(1), ascii(5) 31/Oct/99 BVI Version 1.2.0 8