get substring from string variable

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# 1  
get substring from string variable

Hi Dears,

How to use variable in string location of expression ${string:index:length} to get substring from string?

I encounter error "bad substitution" when I use expression ${$var:0:5} to get first 5 characters from $var.

Could you please help me out of this? Thanks!
# 2  

$ var="TESTING"

$ echo ${var:0:5}

# 3  
I know this is an old post, but here is a cheat sheet on string operations for future searchers: Reference Cards

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