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Text File | 1992-05-06 | 21KB | 697 lines

INSTRUCTIONS FOR SHELL V2.05M 20-Jan-87 ----------------------------- SHELL V2.04. (C)Copyright 1986, Matthew Dillon, All Rights Reserved. You may distribute this program for non-profit only. Shell V2.05M by Steve Drew. -------------------------- -------------------------------------------------------------------------- Note: These Instructions are my specific 2.05M Instructions and Matt's 2.04 merged together. A preceding | indicates that funtionality has been changed/enhanced, a preceding * indicates that this is functionality or a command that has been added in my manx version. for version releases see readme file. --------------------------------------------------------------------------- (A) Compiling (B) Overview (C) Quicky tech notes on implimentation. (D) Command pre-processor (E) Command Line Editing (F) Function Keys (G) Command-list (H) special SET variables (I) example .login file. (A) COMPILING: | makefile supplied. | | Your manx should be patched for 1.2 (c.lib) otherwise fexec wont work | and you'll just get "command not found" for all external commands. (B) OVERVIEW: OVERVIEW of the major features: -simple history -redirection -piping -command search path -aliases -variables & variable handling (embedded variables) -file name expansion via '?' and '*' -conditionals -source files (w/ gotos and labels) -many built in commands to speed things up PROBLEMS -Not really a bug but, if you want to pass a quote to an external command dont forget to use the overide '\' character eg. Relabel df0: \"Blank disk\" -Append '>>' does NOT work with BCPL programs. It does work with all internal and non-bcpl programs. -This version runs UNDER WORKBENCH 1.2 ONLY. (C) QUICK TECH NOTES: PIPES have been implimented using temporary RAM: files. Thus, you should be careful when specifying a 'ram:*' expansion as it might include the temp. files. These files are deleted on completion of the pipe segment. The file names used are completely unique, even with multiple shell running simultaniously. My favorite new feature is the fact that you can now redirect to and from, and pipe internal commands. 'echo charlie >ram:x', for instance. Another favorite: echo "echo mem | shell" | shell To accomplish these new features, I completely re-wrote the command parser in execom.c The BCPL 'RUN' command should not be redirected.. .strange things happen. NO BCPL program should be output-append redirected (>>). (D) Command pre-processor preprocessing is done on the command line before it is passed on to an internal or external routine: ^c where c is a character is converted to that control character. Thus, say '^l' for control-l. $name where name is a variable name. Variable names can consist of 0-9, a-z, A-Z, and underscore (_). The contents of the specified variable is used. If the variable doesn't exist, the specifier is used. That is, if the variable 'i' contains 'charlie', then '$i' -> 'charlie'. If the variable 'i' doesn't exist, then '$i'->'$i' . ; delimits commands. echo charlie ; echo ben. ' ' (a space). Spaces delimit arguments. "string" a quoted string. For instance, if you want to echo five spaces and an 'a': echo a -> a echo " a" -> a \c overide the meaning of special characters. '\^a' is a circumflex and an a rather than control-a. To get a backslash, you must say '\\'. also used to overide alias searching for commands. >file specify output redirection. All output from the command is placed in the specified file. >>file specify append redirection (Does not work with BCPL programs). <file specify input redirection. The command takes input from the file rather than the keyboard (note: not all commands require input). It makes no sense to say 'echo <charlie' since the 'echo' command only outputs its arguments. | PIPE specifier. The output from the command on the left becomes the input to the command on the right. The current SHELL implimentation uses temporary files to store the data. !! execute the previously executed command. !nn (nn is a number). Insert the history command numbered n (see the HISTORY command) !partial search backwards through the history list for a command which looks the same as 'partial', and execute it. # Enter comment. The rest of the line is discarded (note: \# will, of course, overide the comment character's special meaning) (E) Command Line Editing * - Command line can be upto 255 chars. * - Inserts and deletes are handled correctly over * multiple screen lines. The program will keep track of * the line width should the window get resized. * * KEY DEFINITIONS: * Up Arrow Recal previous commands * Down Arrow Recal commands * Left Arrow Move cursor about command line. * Right Arrow " " " " " * ^A Toggle insert/overtype mode. * ^D EOF * ^E Put cursor at end of text. * ^K Delete to end of line. * ^R Retype current line. * ^U Erase entire line. * ^X Erase entire line. * ^Z Put cursor at start of text. * f1 - f10 Execute command if variable exists. * F1 - F10 More commands (Shifted f keys). * Help invokes help command (F) Function keys. * - Just set the variable f1-f10 or F1-F10 (shifted) to * the desired string. * * eg. * $ set f1 "dir -s df0:" (G) COMMAND LIST: The first argument is the command-name... if it doesn't exist in the list below and isn't an alias, it is assumed to be an external (disk) command. AUTOMATIC SOURCING may be accomplished by naming shell scripts with a .sh suffix. Thus, if you say 'stuff' and the file 'stuff.sh' exists in your current or C: directory, it will be SOURCED with any arguments you have placed in the $_passed variable. EXCEPTION_PROCESSING: if no _except variable exists, any command which fails causes the rest of the line to abort as if an ABORTLINE had been executed. If the _except variable exists, it is of the form: "nnn;commands..." where nnn is some value representing the minimum return code required to cause an error. Whenever a command returns a code which is larger or equal to nnn, the commands in _except are executed before anything. WHEN _except EXISTS, THE COMMAND LINE DOES NOT ABORT AUTOMATICALLY. Thus, if you want the current line being executed to be aborted, the last command in _except should be an "abortline". exception handling is disabled while in the exception handling routine (thus you can't get into any infinite loops this way). Thus if _except = ";", return codes are completely ignored. example: set _except "20;abortline" ABORTLINE or just 'abort'. Causes the rest of the line to be aborted. Used in conjunction with exception handling. % echo a;abort;echo b a HELP | simply displays all the available commands. The commands are | displayed in search-order. That is, if you give a partial name | the first command that matches that name in this list is the one | executed. Generally, you should specify enough of a command so that | it is completely unique. QUIT EXIT RETURN [n] quit my SHELL (awww!). End, El-Zappo, Kapow. Done, Finis. If you use RETURN and are on the top source level, the shell exits with the optional return code. (see RETURN below) SET SET name SET name string The first method lists all current variable settings. The second method lists the setting for that particular variable, or creates the variable if it doesn't exist (to "") The last method sets a variable to a string. see the section on special _ variables down below UNSET name name name.... unset one or more variables. Deletes them entirely. ALIAS ALIAS name ALIAS name string same as SET, but applies to the alias list. You can alias a single name to a set of commands. For instance: alias hi "echo a; echo b" then you can simply say 'hi'. Aliases come in two forms the second form allows you to place the arguments after an alias in a variable for retrieval: alias xxx "%i echo this $i is a test" % xxx charlie this charlie is a test The rest of the command line is placed in the specified variable for the duration of the alias. This is especially useful when used in conjunction with the 'FOREACH' command. UNALIAS name name name... delete aliases.. ECHO string ECHO -n string echo the string to the screen. If '-n' is specified, no newline is output. STRHEAD varname breakchar string remove everything after and including the breakchar in 'string' and place in variable 'varname': % strhead j . aaa.bbb % echo $j aaa % STRTAIL varname breakchar string remove everything before and including the breakchar in 'string' and place in variable 'varname': % strtail j . aaa.bbb % echo $j bbb % SOURCE file [arguments] execute commands from a file. You can create SHELL programs in a file and then execute them with this command. Source'd files have the added advantage that you can have loops in your command files (see GOTO and LABEL). You can pass SOURCE files arguments by specifying arguments after the file name. Arguments are passed via the _passed variable (as a single string). Automatic 'sourcing' is accomplished by placing a .sh extension on the file and executing it as you would a C program: --------- file hello.sh --------- foreach i ( $_passed ) "echo yo $i" --------------------------------- % hello a b c yo a yo b yo c MV from to MV from from from ... from todir Allows you to rename a file or move it around within a disk. Allows you to move 1 or more files into a single directory. CD CD .. CD path | Change your current working directory. You may specify '..' to go | back one directory (this is a CD specific feature, and does not | work with normal path specifications). CD without any arguments displays the path of the directory you are currently in. PWD rebuild _cwd by backtracing from your current directory. RM [-r] file file file... DeleteFile(). Remove the specified files. Remove always returns errorcode 0. You can remove empty directories. The '-r' option will remove non-empty directories by recursively removing all sub directories. * If you specify any wildcard deletes the files will be listed as * they are deleted. This can be suppressed by redirecting to nil: | COPY file file | COPY file1 file2...fileN dir | COPY [-r] dir1 dir2...dirN dir copy files or directories. when copying directories, the "-r" option must be specified to copy subdirectories as well. Otherwise, only top level files in the source directory are copied. * All files will be displayed as they are copied and directory's displayed * as they are created. This output can be suppessed by redirecting to nil: * eg. copy -r >nil: df0: df1: * copy will abort after current file on Control-C. MKDIR name name name... create the following directories. HISTORY [partial_string] Displays the enumerated history list. The size of the list is controlled by the _history variable. If you specify a partial- string, only those entries matching that string are displayed. MEM Display current memory statistics for CHIP and FAST. CAT [file file....] Type the specified files onto the screen. If no file is specified, STDIN in used. CAT is meant to output text files only. | DIR [-sdf] [path path ... ] | - default output show's date, protection, block size, byte size. * - Dir command rewritten to allow options: * -s short mutil(4) collum display of files * (directory files are in italics). * -d directorys only * -f files only * -e exclude files. Specify as the next argument a pattern * for the files to be excluded. Do not use * or ? chars * as the '*' is already appended to either side of the * pattern and this prevents the preprosesor from expanding * them. eg. -e .c is merge to *.c* so any file spec * containing a ".c" string is skipped. * * eg. dir -se .info (short directory exclude all .info files.) | the directory command will also not expand files that are | directories if as result of a wildcard expansion. eg: | 'dir df0:*' and 'dir df0:' will give same results | expect previously if df0:* was specified all subdirectories | of df0: were expanded also. | (to list the subdirectories: 'dir df0:*/*') DEVINFO [device: device:... ] Display Device statistics for the current device (CD base), or specified devices. | Gives block used/free, % used, errs and volume name. FOREACH varname ( strings ) command 'strings' is broken up into arguments. Each argument is placed in the variable 'varname' in turn and 'command' executed. To execute multiple commands, place them in quotes: % foreach i ( a b c d ) "echo -n $i;echo \" ha\"" a ha b ha c ha d ha Foreach is especially useful when interpreting passed arguments in an alias or source file. NOTE: a GOTO inside will have indeterminate results. FOREVER command FOREVER "command;command;command..." The specified commands are executed over and over again forever. -Execution stops if you hit ^C -If the commands return with an error code. NOTE: a GOTO inside will have indeterminate results. RETURN [value] return from a source file. The rest of the source file is discarded. If given, the value becomes the return value for the SOURCE command. If you are on the top level, this value is returned as the exit code for the shell. IF argument conditional argument ; IF argument If a single argument is something to another argument. Conditional clauses allowed: <, >, =, and combinations (wire or). Thus <> is not-equal, >= larger or equal, etc... If the left argument is numeric, both arguments are treated as numeric. usually the argument is either a constant or a variable ($varname). The second form if IF is conditional on the existance of the argument. If the argument is a "" string, then false , else TRUE. ELSE ; else clause. ENDIF ; the end of an if statement. LABEL name create a program label right here. GOTO label goto the specified label name. You can only use this command from a source file. DEC var INC var decrement or increment the numerical equivalent of the variable and place the ascii-string result back into that variable. INPUT varname input from STDIN (or a redirection, or a pipe) to a variable. The next input line is placed in the variable. VER display my name and the version number. SLEEP timeout Sleep for 'timeout' seconds. * PS * Gives the following info: * * Proc Command Name CLI Type Pri. Address Directory * 1 SHELL Initial CLI 0 97b0 Stuff:shell * 2 sys:c/clockmem Background -10 2101a8 Workdisk: * 3 c:emacs Background 0 212f58 Stuff:shell * 4 sys:c/VT100 Background 0 227328 Workdisk: * * Address is the addres of the task, directory is the process * currently set directory. (H) SPECIAL SET VARIABLES | _prompt | This variable is set to the command you wish executed that will | create your prompt. Under manx version set this to the string | for your prompt not a command to create the prompt. (Restriction | due to commandline editing support. _history This variable is set to a numerical value, and specifies how far back your history should extend. _debug Debug mode... use it if you dare. must be set to some value _verbose Verbose mode (for source files). display commands as they are executed. _maxerr The worst (highest) return value to date. To use this, you usually set it to '0', then do some set of commands, then check it. _lasterr Return code of last command executed. This includes internal commands as well as external comands, so to use this variables you must check it IMMEDIATELY after the command in question. _cwd Holds a string representing the current directory we are in from root. The SHELL can get confused as to its current directory if some external program changes the directory. Use PWD to rebuild the _cwd variable in these cases. _passed This variable contains the passed arguments when you SOURCE a file or execute a .sh file. For instance: test a b c d -------- file test.sh ---------- echo $_passed foreach i ( $_passed ) "echo YO $i" -------------------------------- _path This variable contains the search path when the shell is looking for external commands. The format is: DIR,DIR,DIR Each DIR must have a trailing ':' or '/'. The current directory is always searched first. The entire path will be searched first for the <command>, then for <command>.sh (automatic shell script sourcing). The default _path is set to "c:,df1:c/,df0:c/,ram:,ram:c/" * When using 'run' command Shell will now use it's own search * path first to find the command to run. If it fails to find * the command (but the Run command was found) it executes the * command line anyway to let amigaDos search path take over. * _insert * Set's the default for insert/overtype mode for command line * editing. ^A toggles between, but after <RET> the default is * set back as indicated by this variable. By default _insert is 1 * indicating insert mode on setting to zero will make overtype * the default. * _width * Indicates the console window width, 77 if unset. * Will change automatically if the user resizes the window. (I) EXAMPLE .login file. from a CLI or the startup-script say 'SHELL filename'. That file is sourced first. thus, 'SHELL .login' will set up your favorite aliases: ------------------------------------------------------------------------ .LOGIN ------------------------------------------------------------------------ # -Steve's .login file- # echo -n "Enter Date [DD-MMM-YY HH:MM] ";input new; DATE $new # ------My search path ------- # set _path ram:c/,ram:,c:,df0:c/,df1:c/,sys:system/,sys:utilities # -------Function keys-------- # set f1 dir df0: set f2 dir df1: set F1 dir -s df0: set F2 dir -s df1: set f3 info set f4 ps # ---------Quickies---------- # # -query delete- # #another favorite eg qd *.c alias qd "%q foreach i ( $q ) \"echo -n Delete [n] ;input a;if $a = y;del $i;endif\"" alias delete rm alias rename mv alias makedir mkdir alias print "%q copy $q prt:" alias info "devinfo df0: df1: ram:" alias tosys "assign c: SYS:c" alias toram "assign c: RAM:c;" alias tomanx "assign c: MANX:c; manxinit" alias d "dir -se .info" alias clr "echo -n ^l" alias wb "loadwb" alias pref "sys:preferences" alias cal "run sys:utilities/calculator" # ------Applications---------- # alias em "run emacs" alias vt "run sys:c/VT100" # --------Finish Up----------- # ver ;echo -n "Shell loaded on ";date ------------------------------------------------------------------------ MANXINIT.SH ------------------------------------------------------------------------ SET INCLUDE=AC:include CCTEMP=ram: makedir ram:lib;Set CLIB=RAM:lib/;copy AC:lib/$libfile ram:lib" alias cleanup "del >NIL: ram:lib/* ram:lib" #run make in background at lower priority: alias make "%q run ChangeTaskPri -5 +^J^J MAKE $q" ------------------------------------------------------------------------ RAM.SH ------------------------------------------------------------------------ cp c:run ram:; cp c:assign ram:; cp c:cp ram:; assign c: ram: