01-07-2010
Unix Scripting Question (Homework)
Hello im currently taking up Operating Systems and we're on unix ryt now. we have to make a script and here are the requirements.. can someone please help me. I would reli appreciate it.. because i dont reli know how to make scripts yet.
Name of script : parkingcharge.sh
Create a script that computes for the total parking charge of a customer. The following information are to be collected as inputs from the standard input :
Plate number (format : 7 characters, the first 3 are characters from ato z followed by a dash followed by a 3 digit number; i.e. : XXX-123)
Time in (format : military time; i.e. 1500 => 3 PM)
Time out (format : military time; i.e. 1900 => 7 PM)
Type of vehicle : can either be the following characeters: L, U or H which stands for Light vehicle, Utility vehicle or heavy vehicle respectively.
The parking lot operates starting at 7 AM and closes at 11:30 PM. The rates of the parking lot is as follows:
Standard parking fee (minimum of 2 hours) - 50 pesos
Succeeding hour or less in excess of 2 hours for :
Light vehicles - 5 pesos
Utility vehicles - 15 pesos
Heavy vehicles - 25 pesos
Futhermore, the maximum parking charge for the following vehicles applies:
Light vehicles - 100 pesos
Utility vehicles - 150 pesos
Heavy vehicles - 250 pesos
The script should be able to validate whether the time in and time out values are VALID inputs based on the value that is entered (time out > time in). Other validations are not to be filtered by the script. The output of the script is the parking charge of the vehicle and its details.
Sample run:
$ parkingcharge.sh
Please enter the plate number (i.e. : AAE-775) : XNY-123
Please enter the type of vehicle (L/U/H) : U
Please enter the time the vehicle entered the parking lot : 0845
Please enter the time the vehicle entered the parking lot : 1915
The vehicle with plate number XNY-123 was parked for 10 hours and 30 minutes. The parking charge for the vehicle is 150 pesos
Try again? : N
Sample run:
$ parkingcharge.sh
Please enter the plate number (i.e. : AAE-775) : GMA-111
Please enter the type of vehicle (L/U/H) : L
Please enter the time the vehicle entered the parking lot : 1245
Please enter the time the vehicle entered the parking lot : 1315
The vehicle with plate number XNY-123 was parked for 0 hours and 30 minutes. The parking charge for the vehicle is 50 pesos
Try again? : N
Note: Make sure the program keeps on repeating until the user enters ‘N' to quit the program.
Hint : You can use the following commands/control structure to complete your script : expr, if, test, for
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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)