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crontab -e
use this command to set the time and commands, you can refer to the manual to get the rules. This command automatically uses a simple editor for user to implement settings. After your...

you should change
awk '{ x=substr($0,1,9); z=substr($0,18); print x "$shell_var" z }' data.txt
to
awk '{ x=substr($0,1,9); z=substr($0,18); print x "'$shell_var'" z }' data.txt

so ,you can use...

a=fadfagr_whatiwant.sh
a=${a#*_}
a=${a%.*}

a is the variable

i write the command in this way
awk '{subs[$1]+=1}END{print subs["dddd"]}'
input context is what you post
it gives 3

$1"_subs"?
i just saw this kind of variable in "MakeFile",maybe shell...