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I'm trying to get a value from awk: I try $(), it shows bad substitution:

a=${awk 'BEGIN { last=substr("[Import][2017-10-30 02:30:45 UTC] End",10,23); print last}'}  
bash: ${awk 'BEGIN { last=substr("[Import][2017-10-30 02:30:45 UTC] End",10,23); print last}'}: bad substitution

but if I use ``, it works well: 

a=`awk 'BEGIN { last=substr("[Import][2017-10-30 02:30:45 UTC] End",10,23); print last}'`

The code in awk works well. I'm trying to use awk to match the last "[Import][2017-10-30 02:30:45 UTC] End" like strings from a file. And the code is used to try.

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Its not valid so, you have to create variable using myvar=$( .... ), whereas basic form of parameter expansion is ${parameter}

From

a=${awk 'BEGIN { last=substr("[Import][2017-10-30 02:30:45 UTC] End",10,23); print last}'}

To

a=$(awk 'BEGIN { last=substr("[Import][2017-10-30 02:30:45 UTC] End",10,23); print last}')
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