Bash script: show progress bar

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To show a bash script progress while loading:

#!/bin/bash   function loading {     char="|"     while :; do         case "$char" in             "|")                 char="/"                 ;;             "/")                 char="-"                 ;;             "-")                 char="\\"                 ;;             "\\")                 char="|"                 ;;         esac         sleep .2s         echo -en "\rLoading $char"     done }   loading & pid=$!   # do something sleep 5s   kill -9 $pid wait $pid 2>/dev/null # Supress "Killed" message echo -en "\r\033[K" # Completely overwrite last line   echo "Done."