[SOLVED] Extracting Required info from a List ...... help needed please

[Just17]

I have been playing about with Pulse Audio of late, and it has commands which can be used to get info and control PA.

So I can generate a list of what is active in PA using the command

pactl list

That gives an output of many things, but what I am interested in is extracting information about the loaded modules. This is what part of the list looks like ...

Code: [Select]

Module #25
Name: module-switch-on-port-available
Argument:
Usage counter: n/a
Properties:


Module #29
Name: module-null-sink
Argument: sink_name=MySink
Usage counter: 2
Properties:
module.author = "Lennart Poettering"
module.description = "Clocked NULL sink"
module.version = "2.0-1pclos2012"

Module #30
Name: module-loopback
Argument: sink=MySink
Usage counter: n/a
Properties:
module.author = "Pierre-Louis Bossart"
module.description = "Loopback from source to sink"
module.version = "2.0-1pclos2012"

Module #31
Name: module-loopback
Argument: sink=MySink
Usage counter: n/a
Properties:
module.author = "Pierre-Louis Bossart"
module.description = "Loopback from source to sink"
module.version = "2.0-1pclos2012"

As can be seen from the above, there are two 'Name: module-loopback' entries.

Although I can load the modules by name, I can only unload them again using the ID number. So I need, I believe, to search the list for each instance of the module name and then extract the module ID # from the previous line, so that number can be used to unload the module.

I hope I am making some sense  

As an example

Module #31
   Name: module-loopback
   Argument: sink=MySink
   Usage counter: n/a
   Properties:
      module.author = "Pierre-Louis Bossart"
      module.description = "Loopback from source to sink"
      module.version = "2.0-1pclos2012"

I want to search for Name: module-loopback and store 31

Alternatively I suppose I could search for all module numbers (could be quite a few) then look for a matching string for the module name I want, and store the last number encountered.

I would appreciate some help with this ....  what might be the best simplest approach etc.

Sorry should have mentioned .......  BASH

Any help appreciated, thank you  

[sir_herrbatka]

something like that?

Code: [Select]

pactl list | grep -B 1 'Name: module-loopback'
PS

If you want to get only numbers then

Code: [Select]

pactl list | grep -B 1 'Name: module-loopback' | grep 'Module #' | cut -d '#' -f 2-

[Just17]

If you want to get only numbers then

Code: [Select]

pactl list | grep -B 1 'Name: module-loopback' | grep 'Module #' | cut -d '#' -f 2-

Thank you.

That is better than my attempt here ...

Code: [Select]

pactl list | grep -B 1 -i "Name: module-loopback" | cut -d "N" -f1 | cut -d "-" -f2 | cut -d "#" -f2
... I was trying to work through it. Obviously I had not trimmed the one-liner as much as possible.

Now I have to get each of the returned numbers into a separate variable ...... like $MODULE1, $MODULE2,$MODULE3, etc

[Just17]

I am looking at something like this ...

Code: [Select]

MyNum=1
for i in $(pactl list | grep -B 1 'Name: module-loopback' | grep 'Module #' | cut -d '#' -f 2-)
do
echo MODULE"$MyNum"=$i
let MyNum=$MyNum+1
done

MODULE1=33
MODULE2=34
MODULE3=35
MODULE4=36
I feel sure there can be improvements made, so please advise 

[sir_herrbatka]

I feel sure there can be improvements made, so please advise 

For me it looks ok and certainly good enough. No need to polish everything ;-)

[Just17]

I feel sure there can be improvements made, so please advise 

For me it looks ok and certainly good enough. No need to polish everything ;-)

Thanks for the help 

[sir_herrbatka]

happy to help

[Just17]

This explains what was behind the questions 

http://www.pclinuxos.com/forum/index.php/topic,105968.0.html

[sir_herrbatka]

BTW You may want to learn awk. It can use two delimiters at once so it's supreme to cut.

[Just17]

BTW You may want to learn awk. It can use two delimiters at once so it's supreme to cut.

  Too lazy 

Looked at both awk and sed a couple of years ago, and decided there was too much effort involved 

[sir_herrbatka]

hehe, same here. Sed is just scary but awk is also useful.