shell scripting

[Baby Chen]

Hello!

I want to make a script that would create a new terminal and automalically issue this command "tail -f /var/log/messages"

Is this possible?

Hope you can help me.

-Baby Chen

[Firewing1]

Make a directory bin in your home:

mkdir ~/bin

Then, edit your script:

gedit ~/bin/name_of_your_script

Always start with this line:

#!/bin/sh

Then, underneath that, start scripting.
And finally make it executable:

chmod +x ~/bin/name_of_your_script

An example for your cause would be:

#!/bin/sh
tail -f /var/log/messages

From there you can run name_of_your_script in a terminal to run the script.
Add a launcher in your panel, and tell it to "run in terminal" by ticking the checkbox. Off you go
BTW, see my sig. Under the "References" menu I have a BASH scripting tutorial.
Firewing1

[Baby Chen]

Thank you very much Firewing1.

The problem is that i dont know how to make a script that would create a new terminal and automalically issue this command "tail -f /var/log/messages" .

Do you know how to make a script like that?

[Baby Chen]

I have done this script:

#!/bin/sh
TERM=linux ./messages


but it would display a messagelike this:

bash: ./messages: Text file busy

[Firewing1]

Originally Posted by Baby Chen

I have done this script:

#!/bin/sh
TERM=linux ./messages


but it would display a messagelike this:

bash: ./messages: Text file busy

I don't see what this does. Linux isn't a command.
Bascially, let's break it down.
TERM=linux
tells TERM variable to hold value of Linux
./messages is a seperate thing, because of the space. So it says it can't because ./messages isn't executable.
If you wanted to make the TERM variable carry the whole linux ./messages
then you'd have to do this:

TERM="linux ./messages"

Although, this won't do anything. To execute a command, you must use it like this:
$(command)
so, for example,

#!/bin/bash
TERM=$(tail -r /var/log/messages)

Will tell TERM to hold the value of whatever tail -r /var/log/messages returns. To echo the result, use

zenity --info --text "$TERM" --title "Messages"

for a GUI window, for a terminal use

echo -e "$TERM"

Firewing1

[Shadow Skill]

Depending on the terminal emulator you are using you may not even need to create a script Gnome terminal for example has a flag for executing commands -e or -x.

[Baby Chen]

Thank you guys for your replies.

Well, I i know already how to open a new konsole that automalically issue this command "tail -f /var/log/messages. Here's my script:

#!/bin/bash
konsole -e tail -f /var/log/messages


Now my problem is how to call a shell script in the GTK+ Glade C code when ever an event in called.

Hope you can help me again.

[Firewing1]

I use PyGTK (Python), so I can't help there. Google is your friend.
Firewing1

[Shadow Skill]

Look up the system() and exec() functions and just work them into your condition so that the script you want executed gets executed when the desired condition is met.

[Baby Chen]

@Firewing1 : i have search in the google or yahoo and found no answer...


@Shadow Skill : Thanks a lot... I will try your suggestion...

[Baby Chen]

ey guys! thanks a lot... i have solved already the problem... and i have another problem again...

I have tried this one:

#!/bin/bash
konsole -e tail -f /var/log/messages #log messages for Fedora Core
konsole -e tail -f /var/log/server1.group.org-bin.log #log messages for mysql


when i run the script above the konsole would only open/execute when I close/exit the first konsole.

How can i display a konsole with tabs? or two konsoles and each konsoles have different commands to run/issue...

How will i do that?

Hope you can help me again..

[Firewing1]

I dont know if you can do that. Just wondering -- Why do you want to run a console? It's much easier to make the command in script form and run that from a console. Launchers can start the consoles for you. Another advantage to this approach is it works in a CLI mode. Starting konsole to do your command will not work in a CLI b/c it will complain of X not running. For now, you may think this will not be an issue, but believe me later on, when you like the CLI, or when you're SSHing it will.
Firewing1

[Baby Chen]

Hi Firewing1...

The use of this running the script on a konsole to monitor my system through its log messages. Right now I dont have any knowledge in CLI or SSH.

I have editted my post before this one pls read... hope you understand what im saying..

TC!

[Firewing1]

Originally Posted by Baby Chen

i run the script above the konsole would only open/execute when I close/exit the first konsole.

Try this:

#!/bin/bash
konsole -e tail -f /var/log/messages                               #log messages for Fedora Core &
konsole -e tail -f /var/log/server1.group.org-bin.log        #log messages for mysql &

As for what to do, you can leave it in a konsole, but personally I'd to this:
1) Change the script to:

#!/bin/bash
echo '-- MESSAGES --'
tail -f /var/log/messages                               #log messages for Fedora Core
echo -n '[enter] to continue';read -n 1 nothing
echo '-- MYSQL --'
tail -f /var/log/server1.group.org-bin.log        #log messages for mysql

then make a launcher in KDE that does

konsole -e the_script_name

That way, you still see a konsole, there's no difference, but it will not work from CLI, SSH, or anything else.
Firewing1

[Baby Chen]

[qoute]
#!/bin/bash
konsole -e tail -f /var/log/messages #log messages for Fedora Core &
konsole -e tail -f /var/log/server1.group.org-bin.log #log messages for mysql
[/qoute]

I have tried that one but its not the output i want to.

I want to open a konsole simlutaneously in one script.