Simple Linux script.

[tblue]

Hi,

Im a total novice with Linux and am trying to alter a script on an embbed linux board.

Basically the script at the moment is..

cd /usr/bin
arm-app

So it changes directory and then runs our arm application.

What I would like it to do is this.

cd /usr/bin
if FileExists ( Upgrade.tar) then
uncompress to local directory ( overwrite )
delete upgrade.tar
end
arm-app

Im sure this is "bread and butter" to you wizards, but I really am struggling being a poor windows user.

Appreciate any help you can give.

Regards
Ashley.

[RobinVossen]

if FileExists ( Upgrade.tar) then
uncompress to local directory ( overwrite )
delete upgrade.tar
end

you are on about Bash Scripting?
Since that looks like horrid Batch..

try
if(-e Upgrade.tar)
tar -xvf Upgrade.tar
rm Upgrade.tar
fi

[tblue]

Hi,

Thanks for the help.

I copied that into the file and get an error.

./test.sh: line 4: syntax error near unexpected token `fi'
./test.sh: line 4: `fi'

Not to worry, I have had a look around the forum now and I see some other helpful chaps have linked to some handy scripting sites.

Thanks.
/Ash

[WuNMOjTIQanXWBcH]

if(-e Upgrade.tar)
tar -xvf Upgrade.tar
rm Upgrade.tar
fi

I copied that into the file and get an error.

./test.sh: line 4: syntax error near unexpected token `fi'
./test.sh: line 4: `fi'

The correct syntax is:

#! /bin/sh
cd /usr/bin;
if [ -e Upgrade.tar ]; then
	(tar -xf Upgrade.tar && rm Upgrade.tar) > /dev/null;
fi

Note: this code removes Upgrade.tar only if unpacking the file was successful. Furthermore it swallows any messages from both commands that are not delivered through the standard error output.

[RobinVossen]

I was kinda thinking he could think for himself. Just giving a pointer

[WuNMOjTIQanXWBcH]

I was kinda thinking he could think for himself. Just giving a pointer

Iʼm sorry, I misunderstood your answer. I will try to keep things like that in mind for the future. As for my defense: Because the code wasnʼt explicitely marked as pseudo code, any future reader of this thread might misconceive it for actual code and get unneccessarily confused. A hint might be appropriate.