Bash M1## how to use the P word

That unfortunately didn't work. I have a feeling I have misunderstood how the M1## bash system works. 
if I enter this M170 in linuxcnc it works
#!/bin/bash
halcmd setp classicladder.0.in-50 true
exit 0 ;

however this M170 P01 code doesn't
#!/bin/bash
case $1 in
         01)
         halcmd setp classicladder.0.in-50 true
         ;;
esac
exit 0 ;

their must be alot of things going on behind the scenes in linuxcnc that I can't
see,  know about,  or probably don't understand.
I do have a theory that I may need to come up with a hal component to make
use of the P## as a varriable and the hal component determines what pins
to switch high or low instead of it happening in the M170 bash command.

Run LinuxCNC from command line

And change the script to:

however this M170 P01 code doesn't
#!/bin/bash
echo „P:“
echo $1
case $1 in
01)
echo „case true“
halcmd setp classicladder.0.in-50 true ;;
esac
exit 0

There you should see what the P value is

terminal responds
1.000000

I am unfortunately still very much a noob. Not just on Linuxcnc but also to Linux in general.

How did you make the upside down double quotes or ".  I couldn't duplicate that.

Aciera post=220580 userid=25994I believe the quotes depend on the location setting.
It should work with either ' ' or " " quotes.

Okay. That makes sense.
 

Yes I am in Germany sorry for the strange quotation marks.
, and as I pointed out this looks like a float int problem. You try to compare an intern with a float, and that doesn‘t work
Aciera already pointed you into the right direction try this

#!/bin/bash
P = ${1%.*}
Q = ${2%.*} # in case you want to use the second parameter to
echo " P: ${P} Q: ${Q}";

case $P in
1) echo „case true“
halcmd setp classicladder.0.in-50 true ;;
esac
exit 0

as soon as everything work you can remove or comment the echos. This is my stupid way of debugging

I tried the new suggested code  and unfortunately it didn't work for me.
I think Linuxcnc has the M100 through M199 specifically coded to just
pass through the P and Q floats to a hal component and wont let you
use them in case, or if statement arguments.

I use around 20 different bash written m codes with if or case statements it works.

I also have a debug m code that uses zenity to show the p and q.

I don’t have Access to my machines now. So I can’t attach them. But if can read german you’ll find some at barn.works in my blog entries for the mill conversion

when I get a chance I will give it a try Aciera.

Anfanger, Unfortunately I can't currently read German however I can always try translating the words .
From what I have seen from your site their are a lot of good example to examine.

Thank you both for your help thus far.