Script parameter

Shell Programming and Scripting
1

Hello!

I have a question about scripts with parameters.
I have a install script and i want it to start the daemon if the install_script has the parameter start at execution.

If there is not a parameter it should just do the install routine and leave the start part untouched.

But i dont want to copy the whole script twice

case $1 in
 start)
    [...whole script with start]
 * ) 
    [...script without start routine]
esac

Is something like this possible?

kind regards

2

This one ways to do it. (move code to run everytime after esac )
This will run #normal script every time

#!/bin/bash
# start block
case $1 in
 start)
   <some start code>
   <some start code>
esac

#normal script
<some code>
<some code>

To run only start code when start is added

#!/bin/bash
# start block
case $1 in
 start)
   <some start code>
   <some start code>
   exit 0
esac

#normal script
<some code>
<some code>

#!/bin/bash
# start block
if [ "$1" = "start" ]; then
   <some start code>
   <some start code>
fi

#normal script
<some code>
<some code>
3

Is this also working the other way around?

#!/bin/bash
#normal script
<some code>
<some code>

# start block
if [ "$1" = "start" ]; then
   <some start code>
   <some start code>
fi

Because the install stuff has to happen first. Otherwhise it will not start :smiley:

kind regards

4

This way, it will first run normal script and then start script if start is given

5

So it would be your first example in post #2?

kind regards

6 
#!/bin/bash
# start block
case $1 in
 start)
   <some start code>
   <some start code>
esac

#normal script
<some code>
<some code>

This will run start block if start is given.
Then it run normal script , regardless of start no start .
Not sure if this is what you want.

7

yeah propably. The thing is that the normal part has to be executed first because otherwhise the start part will not work.

Is it still working if i put the case block at the bottom of the script?

kind regards

8 
#!/bin/bash
#normal script
<some code>
<some code>

# start block
if [ "$1" = "start" ]; then
   <some start code>
   <some start code>
fi

Then you need this.
Normal first, and then start, but only if start is set.

Every script starts from top and run down, easy to understand.

9

Ok so as every other language :wink:

But if I do it this way, it will not throw errors if there is a missing parameter?

After some google if found that shell is capable to do function, so i come around with this.

case $1 in

	start)
		F_INSTALL; sleep 5; F_START; 
	*)
		F_INSTALL; 
esac

kind regards

10

It's better to use getops for parsing command line arguments.
getopts - Wikipedia, the free encyclopedia

Hope that helps
Regards
Peasant.