basic BASH template (execute, vexecute, die)

BASH_script_alt3.sh

#!/bin/bash

cat > functions.sh <<'EOF'
#!/bin/bash

die() {
  local exit=$2 ;
  echo "$exit" | egrep '^[0-9][0-9]*$' &> /dev/null || exit=1 ;
  echo "$1" ;
  exit $exit ;
}
execute() { # Notice and say so when a command has a non-zero exit status.
  local e=0 ;
  # echo "Executing." 1>&2 ;
  "$@" || e=$? ;
  [[ $e -eq 0 ]] || echo "ERROR: $e executing {$@}." 1>&2 ;
  return $e ;
}
vexecute() { # Verbose execute (say the command before running it).
  echo "Executing {$@}." 1>&2 ;
  execute "$@" ;
}
[[ $DEBUG -lt 2 ]] || echo "Sourced functions.sh ." 1>&2 ;
true ;

#
EOF


# # #



cat > bash_script.sh <<'EOF'
#!/bin/bash

main() {
  true ;
  # # # TODO: Make the script do something.
}
final() { # Never define final() in functions.sh - only ever define it in an actual script.
  [[ $DEBUG -lt 2 ]] || echo "final() { \$?: $? }" ; # Usually shows an exit code of 1 for some mysterious reason. QQQ
  echo final_in_script ;
}
trap final EXIT ;

cd $(dirname $0) && main "$@" || { e=$? ; echo "ERROR: '$e' with main in $0." ; exit $e ; } ;

#
EOF

bash bash_script.sh ; echo $?

#