Shell: get value from key=value file with value trim and key trim, and allow `=` ` space` in value

getVal.sh

#!/bin/sh

# These vars and func are used to get value from a key=value file
# It will also trim the leading and trailing whitespace, tab
# Key with space after or before is supported
getVal(){
    # cut `=` in val: https://unix.stackexchange.com/a/53315/207518
    # grep: allow space after or before of key
    # awk trim space after and before of value: https://unix.stackexchange.com/a/205854/207518
    declare val=$(cat ${1} | grep "^ *${2} *=" | cut -d '=' -f 2- | awk '{$1=$1}1')
    # eval: https://unix.stackexchange.com/a/250178/207518
    eval ${3}=\$val
}

# Example
getVal keyval.txt key01 myVal
echo "|$val|"
echo "|$myVal|"

keyval.txt

abc=123
akey01=4563456
  key01 =	    adsfadf                234 sfda @#$% sdafa;][34d= dsf asdf k-= 5