Shell script execution on two different Linux OS

yamanoorsai · 08-22-2012, 03:14 PM

I have the following sample piece of script that works properly on Ubuntu but it stops working when I switch to slackware:

Code:

dialog --title "Test" --gauge "Copying file." 6 100 < <(
    rsync -a --progress test.tar.gz /media/sda1 | 
    unbuffer -p grep -o "[0-9]*%" | 
    unbuffer -p cut -f1 -d '%'  
    )

The error is:

Code:

Syntax error near unexpected token `<'

If I get rid of dialog command, I am able to execute the script. What could be wrong?

cortman · 08-22-2012, 03:17 PM

Quote:

Originally Posted by yamanoorsai

I have the following sample piece of script that works properly on Ubuntu but it stops working when I switch to slackware:

Code:

dialog --title "Test" --gauge "Copying file." 6 100 < <(
    rsync -a --progress test.tar.gz /media/sda1 | 
    unbuffer -p grep -o "[0-9]*%" | 
    unbuffer -p cut -f1 -d '%'  
    )

The error is:

Code:

Syntax error near unexpected token `<'

If I get rid of dialog command, I am able to execute the script. What could be wrong?

It makes a difference what shell you are using; Ubuntu uses Dash, Slack uses Bash AFAIK. I don't believe Dialog comes with Bash.

NevemTeve · 08-22-2012, 03:18 PM

Code:

dialog ... < <(...

what this syntax means?

yamanoorsai · 08-22-2012, 03:20 PM

I installed dialog myself. The dialog tool works perfectly in all other cases. In fact, I am using a similar syntax in a while loop. I had no problems in that context. It keeps failing here

yamanoorsai · 08-22-2012, 03:27 PM

Quote:

what this syntax means?

I adopted the syntax from here:

Code:

http://bash.cyberciti.biz/guide/A_progress_bar_(gauge_box)

It basically redirects stdout to dialog command to provide percentage input to the command

yamanoorsai · 08-22-2012, 08:17 PM

I found the problem. There was a bash version mismatch. I wrote the script on a newer version of bash. Yet to fix the problem due to the version mismatch