12-17-2008
You have to know ahead of time or lookup what the newest version is: off the net with maybe wget or from a file.. The OS does not know anything about what the newest version is.
I really do not understand what you are doing. If you are deploying something that requires version c of the OS (or some utility) on a box running version a, what do you intend to do in your code?
Code like that should abend with an error message complaining about versions, in the worst case.
A more user-friendly approach is to do what sysconf() does - learn about the system, then call code which is friendly to the environment. Find a way not to have to issue a nasty message. Especially if you want users to actually use the code.
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LEARN ABOUT DEBIAN
liquidsoap
LIQUIDSOAP(1) General Commands Manual LIQUIDSOAP(1)
NAME
liquidsoap - a multimedia streaming language
SYNOPSIS
liquidsoap [options] [script|expression]
DESCRIPTION
Liquidsoap is a programming language for describing multimedia streaming systems. It is very flexible, making simple things simple but
giving a lot of control for advanced uses. Liquidsoap supports audio, video and MIDI streams, and a wide range of input/output operators
including Icecast and various soundcard APIs. It can perform a broad range of signal processing, combine streams in various ways, support
custom transitions, generate sound procedurally... and all this can be assembled as you wish. Input files can be accessed remotely, or
even be synthesized on the fly using external scripts such as speech synthesis. Finally, interaction with a running liquidsoap instance is
possible via telnet or socket.
Liquidsoap scripts passed on the command line will be evaluated: they shall be used to define the streaming system to be ran. It is possi-
ble to pass multiple scripts; they will all be ran successively, and definitions from one script can be used in subsequent ones. A script
will be read from standard input if - is given as script filename. Information about scripting liquidsoap is available on our website:
http://savonet.sf.net/
If the parameter is not a file it will be treated as an expression which will be executed. It is a convenient way to test simple one-line
scripts. When running only one-liners, the default is to log messages directly on stdout rather than to a file.
OPTIONS
-
Read script from standard input.
-- Stop parsing the command-line and pass subsequent items to the script.
--debug
Print debugging log messages.
--dynamic-plugins-dir path
Directory where to look for plugins.
--errors-as-warnings
Issue warnings instead of fatal errors for unused variables and ignored expressions. If you are not sure about it, it is better to
not use it.
--interactive
Start an interactive interpreter.
--list-plugins
List all plugins (builtin scripting values, supported formats and protocols).
--list-plugins-xml
List all plugins (builtin scripting values, supported formats and protocols), output as XML.
--no-pervasives
Do not load pervasive script libraries.
--version
Display liquidsoap's version.
-c, --check
Check and evaluate scripts but do not perform any streaming.
-cl, --check-lib
Like --check but treats all scripts and expressions as libraries, so that unused toplevel variables are not reported.
-d, --daemon
Run in daemon mode.
-f, --force-start
For advanced dynamic uses: force liquidsoap to start even when no active source is initially defined.
-h plugin
Print the description of a plugin, eg. a builtin scripting function.
-i Display infered types.
-p, --parse-only
Parse scripts but do not type-check and run them.
-q, --quiet
Do not print log messages on standard output.
-r filename
Process a request.
-T, --disable-telnet
Disable the telnet server.
-U, --disable-unix-socket
Disable the unix socket.
-t, --enable-telnet
Enable the telnet server.
-u, --enable-unix-socket
Enable the unix socket.
-v, --verbose
Print log messages on standard output.
--conf-descr-key key
Describe a configuration key.
--conf-descr
Show all configuration keys with their documentation.
--conf-descr-liqi
Show all configuration keys with their documentation in liqi (documentation wiki) format.
--conf-dump
Dump the configuration state
-help, --help
Display this list of options
SEE ALSO
Our website http://savonet.sf.net/ and the HTML documentation coming with your distribution of liquidsoap.
AUTHOR
Savonet team <savonet-users@lists.sourceforge.net>
Liquidsoap 1.0.1 June 25, 2012 LIQUIDSOAP(1)