Shell Scripting passing arguments to a system binary and storing the value -

I was trying to work it on some occasions, but I think there is a slight problem.

Asterisk-RX "Core Show Call" | | Grep "active" | Cut-D '' -f1

Execute command, runs from / usr / sbin / asterisk , launches it equally, makes executable executable Pipes out the output and, for the active call, grep generally receives an integer value, which I want to store in one variable and continue to make the script work from there.

I have been given a hard time for command.

I basically try to make that command in a shell script and store the value.

Can you point me towards the right direction?

about it:

  active = $ (esteqik-rx "Core show call" | Ajax '$ 2 ==' active "{N = $ 1} END {printf ("% d ", n)} ')  

To ensure this For awk uses printf , if the active call line is left in your output, your variable is assigned 0 instead of blank.

Or alternatively, if you have a shell bit, you can use it to avoid all pipes:

  read active _ _; If ["$ what" = "active"]; The breaker then & lt;  

At the end of this loop, if no "active call" lines were observed, then $ active is empty If you want, you can add:

  active = $ {active: -0}  

to specify a zero value If someone is not active call is reported.

(In my tests, 0 active call reports with each run, so this blank handling is just insurance.)