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in ur code replace as

state3=`expr $state3 - $ct`

# s=0;while read x;do s=$(($s + $x));done < file.txt;echo $((8725 - $s))
287

change the below line and execute...

while read ct

its not $ct

Also use code tags when posting error logs, example data, code snippets, thanks. Indention of code can also be useful.

Remove the $:

while read ct

While there are a couple of ways to pass the shell variables to a Perl one-liner, you may be better off with a proper Perl program. You pass parameters just like you would to a shell script.


$...

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No flames,...