Bad substitution error when using bash -


this question has answer here:

so wanted bash script whenever run "bad substitution" error. have browsed stackoverflow , tried solutions none worked :/ ideas?

#!/bin/bash printf "hello. ots setup script provided damon @ otland. please standby user input may required." read -r -p "do want install webpanel? [y/n]" response  response=${response,,} # tolower  if [[ $response =~ ^(yes|y| ) ]];     wget https://raw.githubusercontent.com/nicolasloew/vps/master/panelsetup.sh     sh panelsetup.sh  fi  printf "if installed webpanel please navigate http://yourip:2004/ , follow install instructions."  printf "once have installed webpanel login , go enduser-->configuration-->apache , delete in config , replace https://raw.githubusercontent.com/nicolasloew/vps/master/apacheconfig. needed znote later." read -r -p "do want compile latest tfs? [y/n]" response  response=${response,,} # tolower  if [[ $response =~ ^(yes|y| ) ]];     wget https://raw.githubusercontent.com/nicolasloew/vps/master/tfsauto.sh     sh tfsauto.sh  fi  printf "you have compiled tfs! can start going cd forgottenserver , execute ./tfs. dont forget configure config.lua though. can create database in webpanel-->enduser."  read -r -p "do want install znoteaac? [y/n]" response  response=${response,,} # tolower  if [[ $response =~ ^(yes|y| ) ]];   wget https://raw.githubusercontent.com/nicolasloew/vps/master/znotesetup.sh   sh znotesetup.sh    fi printf "you havee setup znoteaac. navigate http://yourip , follow instructions."

edit comments

the edit invoked as

sh otsetup.sh

you invoking script sh , not bash.

the parameter substitution using put string lowercase

response=${response,,} # lower

is available using bash version 4.0

so either call script modern bash or use syntax not bash-dependant.

for example

response=$(echo "$response" | tr '[:upper:]' '[:lower:]')

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