User Commands SLSH(1) NAME slsh - Interpreter for S-Lang scripts SYNOPSIS slsh [ --help ] [ --version ] [ -g ] [ -n ] [ --init file ] [ --no-readline ] [ -e string ] [ -i ] [ -t ] [ -v ] [ -|script-file args... ] DESCRIPTION slsh is a simple program for interpreting S-Lang scripts. It supports dynamic loading of S-Lang modules and includes a readline interface for interactive use. OPTIONS --help Show a summary of options --version Show slsh version information -g Compile with debugging code, tracebacks, etc -n Don't load the personal initialization file --init file Use this file instead of ~/.slshrc --no-readline Do not use a readline interface for the interactive mode -e string Execute ``string'' as S-Lang code. -i Force interactive mode. Normally slsh will go into interactive mode if both stdin and stdout are attached to a terminal. -t Normally, slsh will call slsh_main if it is defined. This option prevents that from happening making it use- ful for checking for syntax error. -v Show verbose loading messages. This is useful for see- ing what files are being loaded. INITIALIZATION Upon startup, the program will try to load slsh.rc as fol- lows. If either SLSH_CONF_DIR or SLSH_LIB_DIR environment variables exist, then slsh will look look in the correspond- ing directories for slsh.rc. Otherwise it will look in: SunOS 5.10 Last change: 08 September 2007 1 User Commands SLSH(1) $(prefix)/etc/ (as specified in the Makefile) /usr/local/etc/ /usr/local/etc/slsh/ /etc/ /etc/slsh/ The slsh.rc file may load other files from slsh's library directory in the manner described below. Once slsh.rc has been loaded, slsh will load $HOME/.slshrc if present. Finally, it will load the script specified on the command line. If the name of the script is -, then it will be read from stdin. If the script name is not present, or a string to execute was not specified using the -e option, then slsh will go into interactive mode and read input from the terminal. If the script is present and defines a function called slsh_main, that function will be called. LOADING FILES When a script loads a file via the built-in evalfile func- tion or the require function (autoloaded by slsh.rc), the file is searched for along the SLSH_PATH as specified in the Makefile. An alternate path may be specified by the SLSH_PATH environment variable. The search path may be queried and set during run time via the get_slang_load_path and set_slang_load_path functions, e.g., set_slang_load_path ("/home/bill/lib/slsh:/usr/share/slsh"); INTERACTIVE MODE When slsh is invoked without a script or is given the -i command line argument, it will go into into interactive mode. In this mode, the user will be prompted for input. The program will leave this mode and exit if it sees an EOF (Ctrl-D) or the user exits by issuing the quit command. If an uncaught exception occurs during execution of a com- mand, the error message will be shown and the user will be prompted for more input. Any objects left on the stack after a command will be printed and the stack cleared. This makes interactive mode useful as a calculator, e.g., slsh> 3*10; SunOS 5.10 Last change: 08 September 2007 2 User Commands SLSH(1) 30 slsh> x = [1:20]; slsh> sum (sin(x)-cos(x)); 0.458613 slsh> quit; Note that in this mode, variables are automatically declared. The interactive mode also supports command logging. Logging is enabled by the start_log function. The stop_log function will turn off logging. The default file where logging information will be written is slsh.log. An alternative may be specified as an optional argument to the start_log func- tion: slsh> start_log; Logging input to slsh.log . . slsh> stop_log; slsh> start_log("foo.log"); Logging input to foo.log . . slsh> stop_log; slsh> start_log; Logging input to foo.log Similarly, the save_input function may be used to save the previous input to a specified file: slsh> save_input; Input saved to slsh.log slsh> save_input ("foo.log"); Input saved to foo.log As the above examples indicate, lines must end in a semi- colon. This is a basic feature of the language and permits commands to span multiple lines, e.g., slsh> x = [ 1,2,3, 4,5,6]; slsh> sum(x); For convenience some users prefer that commands be automati- cally terminated with a semicolon. To have a semicolon silently appended to the end of an input line, put the fol- lowing in $HOME/.slshrc file: #ifdef __INTERACTIVE__ slsh_append_semicolon (1); #endif SunOS 5.10 Last change: 08 September 2007 3 User Commands SLSH(1) The interactive mode also supports shell escapes. To pass a command to the shell, prefix it with !, e.g., slsh> !pwd /grandpa/d1/src/slang2/slsh slsh> !cd doc/tm slsh> !pwd /grandpa/d1/src/slang2/slsh/doc/tm Finally, the interactive mode supports a help and apropos function: slsh> apropos list apropos list ==> List_Type list_append list_delete . . slsh> help list_append list_append SYNOPSIS Append an object to a list USAGE list_append (List_Type, object, Int_Type nth) . . For convenience, the help and apropos functions do not require the syntactic constraints of the other functions. MISCELLANEOUS SCRIPTS Several useful example scripts are located in $prefix/share/slsh/scripts/, where $prefix represents the slsh installation prefix (/usr, /usr/local,...). These scripts include: sldb A script that runs the S-Lang debugger. jpegsize Reports the size of a jpeg file. svnsh A shell for browsing an SVN repository. AUTHOR The principal author of slsh is John E. Davis . The interactive mode was provided by Mike Noble . The S-Lang library upon which slsh is based is primarily the work of John E. Davis with help from many others. SunOS 5.10 Last change: 08 September 2007 4 User Commands SLSH(1) This manual page was originally written by Rafael Labois- siere for the Debian system (but may be used by others). Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 any later version published by the Free Software Foundation. On Debian systems, the complete text of the GNU General Pub- lic License can be found in /usr/share/common-licenses/GPL ATTRIBUTES See attributes(5) for descriptions of the following attri- butes: _______________________________________ | ATTRIBUTE TYPE | ATTRIBUTE VALUE| |_______________________________________ | Availability | SUNWslang | |_______________________________________ | Interface Stability| Volatile | |____________________|_________________| NOTES Source for S-Lang is available on http://opensolaris.org. SunOS 5.10 Last change: 08 September 2007 5