Shell Script.

[bsdnewbie999]

How do I create a shell script that run the following command.?


mplayer -playlist r1live.ram

[ocicat]

How do I create a shell script that run the following command.?


mplayer -playlist r1live.ram


Place the following into a file:

#!/bin/sh

mplayer -playlist r1live.ram
Assume the filename is playlist. Also note that "#!/bin/sh" must begin on line 1, column 1.
Add executable rights to the file:

chmod +x playlist

[Carpetsmoker]

Maybe using an alias is simpler/faster, for example:

alias mp 'mplayer -playlist r1live.ram'

[TerryP]

If the script is not being executed from the same directory as the r1live.ram file, you might want to put an explicit path.

mplayer -playlist ~/Music/Playlists/r1live.ram


or where ever you put the playlist.



This is especially useful if you intend to use this script as part of some kind of menu/dock or desktop shortcut.

[18Googol2]

Maybe using an alias is simpler/faster, for example:

alias mp 'mplayer -playlist r1live.ram'

I dont think it would be faster because everytime you start a new shell session, the shell have to read through the startup script file (perhaps alias file as well) again


Place the following into a file:

#!/bin/sh

mplayer -playlist r1live.ram
Assume the filename is playlist. Also note that "#!/bin/sh" must begin on line 1, column 1.
Add executable rights to the file:

chmod +x playlist


You can just put

mplayer -playlist r1live.ram

into the file playlist and do

bash/sh playlist

Im sure you recognize it raises a fairly serious security issue here :)

[Carpetsmoker]

Maybe using an alias is simpler/faster, for example:

alias mp 'mplayer -playlist r1live.ram'

I dont think it would be faster because everytime you start a new shell session, the shell have to read through the startup script file (perhaps alias file as well) again

Hm? It would do this anyway ...?

Using an alias won't spawn an instance of sh, using a script does ...

But what I mainly meant was that it's faster/easier to set up and maintain, especially if you have lots of little shortcuts like this ... This is how I prefer to do things.

[TerryP]

From FreeBSDs manual on /bin/sh


Unlike older versions of sh the ENV script is only sourced on invocation
of interactive shells. This closes a well-known, and sometimes easily
exploitable security hole related to poorly thought out ENV scripts.



How ksh and bash handle it when called as /bin/sh, I wouldn't know off hand.

[bsdnewbie999]

Maybe using an alias is simpler/faster, for example:

alias mp 'mplayer -playlist r1live.ram'

What is alias? I need to paste the code into a file ? And chmod +x ?

[18Googol2]

Nope, the % indicates its a command.

Actually, the correct command is

% alias mp='mplayer -playlist r1live.ram'

The above alias is valid in the current shell session only. You might wanna put it in the shell startup script so that the alias will be set in every new shell session

[bsdnewbie999]

I see.

I have another question. Can I write a GUI shell program (like a calculator program) ?

[Carpetsmoker]

Actually, the correct command is

% alias mp='mplayer -playlist r1live.ram'

Ommiting the = works fine in (t)csh, but according to IEEE Std 1003.1 (http://www.opengroup.org/onlinepubs/009695399/utilities/alias.html) the = is required ... So better get in to the habit of using it ... Thank you.

I have another question. Can I write a GUI shell program (like a calculator program) ?

There are some tools, like dialog, xdialog, zenity, ad probably a few more ...

[bsdnewbie999]

Besides shell script, is there other programming language that run GUI in OpenBSD like C, java...etc ?

[Carpetsmoker]

Yes, just about any programming language can (Including C and Java).

[ocicat]

Besides shell script, is there other programming language that run GUI in OpenBSD like C, java...etc ?

Java Swing
Python/wxPython
Perl/TK

[TerryP]

I believe the Korn Shell has some form of access to a GUI toolkit but have never actually looked into it.


Beyond scriptable interfaces like dialog/kdialog and whatever else is out there (which can create portability nightmares for scripts) a general purpose programming language and GUI toolkit is usually best for doing non-trival work.


If your not familiar with GUI toolkits, I'd suggest Qt -- it is well documented (in C++) and has bindings to many languages. PyQt (Python bindings to Qt) also makes things very painles to use/learn if you know enough C++ to follow the Qt documentation.


If your familiar with either language, Javas Swing and just about all of Pythons bindings to toolkits are probably good choices as well.


You could probably do a GUI application on OpenBSD in Assembly if you wanted to get jigy with it.

[BSDfan666]

Why hasn't anyone mentioned the curses library? :)

[18Googol2]

Why hasn't anyone mentioned the curses library? :)

Its not GUI, it is still text based

[BSDfan666]

Its not GUI, it is still text based
It's a GUI according to my books, "Graphical User Interface", while it might just be a clever use of escape codes... looks pretty graphical too me.

[Carpetsmoker]

Text user interface

[BSDfan666]

Fuck tradition, I can think for my self, it's a GUI. :)

[TerryP]

Hahahahahhahaha


I've never considered curses fun to program (in C) but what ever rocks your boat.

[bsdnewbie999]

I think I'll use Java. Since I don think Zenity can fufill my requirements.