Start one command after another has finished

snowman81 · 12-14-2007, 05:05 PM

This should be really simple. I'm trying to burn some episodes to dvd using this command:

Code:

 tovid -in b1.avi -out bloodspell_1

The problem is I have to wait for one to finish and start the next. The next would be in increasing order. So like this:

Code:

tovid -in b2.avi -out bloodspell_2

I was wondering if I put each line in a BASH script right in a row, would it wait for one to finish before starting the next?

Hiko · 12-14-2007, 05:29 PM

Aloha,
Yes it should. bash commands go in sequence one after the other normally. This might be able to be modified but I am not sure how. You could also put a pause after each one finishes so you could do anything else you need to and then "Hit any key to continue." Not sure how to do that either but it's a start.
Mahalo,
Edward

snowman81 · 12-14-2007, 06:02 PM

Ok, well I created a BASH script but I was trying to be clever and have a variable change the number of the episode like this

Code:

#! /bin/bash

COUNT=8
# bash until loop
until [ $COUNT -gt 12 ]; do
        echo Value of count is: $COUNT
	echo tovid -in b$count.avi -out bloodspell_$count
        let COUNT=COUNT+1
done

This obviously doesn't work so do you have any idea as to how to format the COUNT variable so it fits into the script?

ntubski · 12-14-2007, 06:11 PM

Bash is case sensitive (like most unix tools), you need to use

Code:

 echo tovid -in b$COUNT.avi -out bloodspell_$COUNT

snowman81 · 12-14-2007, 06:13 PM

Awww Man, I knew it was something easy. Thanks.

Oh, one more thing. If it asked a yes or no question before it started the next one, could I just put "yes" on th enext line?

ntubski · 12-17-2007, 04:24 PM

I'm not sure who "it" is. If you mean the tovid program, and putting a "yes" on the next line in the script, that won't work. I'm not familiar with this program, but it might have an option to just go ahead without asking any questions, see its man page. You could also pipe the word "yes" into its standard input:

Code:

echo yes | tovid -in b$COUNT.avi -out bloodspell_$COUNT

gnashley · 12-18-2007, 04:03 AM

No, the yes program is meant to automazically answer yes to questions which stop execution. What you need is read:

Code:

.... code

echo "Would you like to continue? y/n"

read ANSWER

if [ "$ANSWER" = "y" ] ; then
  true
else
  exit
fi