Exit Shell Script Based on Process Exit Code

ls -al file.ext
rc=$?
if [[ $rc != 0 ]] ; then
    exit $rc
fi

ls -al file.ext | sed 's/^/xx: /"

set -e
set -o pipefail

command1 && command2 && command3

command1 && command2 && command3

if command1
   then
       if command2
           then
               do_something
           else
               exit
       fi
   else
       exit
fi

# this will trap any errors or commands with non-zero exit status
# by calling function catch_errors()
trap catch_errors ERR;

#
# ... the rest of the script goes here
#

function catch_errors() {
   # do whatever on errors
   #
   #
   echo "script aborted, because of errors";
   exit 0;
}

[ $? -eq 0 ] || exit($?) # exit for none-zero return code