Shell Programming and Scripting

 echo "teCertificateId" | awk -F'Id' '{ print $1 }' |  awk -F'te' '{ print $2 }'
Certifica

Certificate

var=teCertificateId
var2=${var#te}
var3=${var2%Id}
echo "$var3"

echo "$var" | sed 's/^te//;s/Id$//'

$  echo "teCertificateId" | awk -F'Id' '{sub(/^te/,"",$1); print $1 }'
Certificate

echo "teCertificateId"| sed 's/^te//; s/Id$//'

 
echo "teCertificateId" | nawk '{gsub("^te|Id$","",$0);print}' 
Certificate

var="teCertificateId"
var2="${var#te}"
echo "${var2%Id}"

var=teCertificateId
var2="{var##??}"
echo "{var2%%??}"