set

Display, set or unset values of shell attributes and positional parameters. More information: https://manned.org/set.

• Display the names and values of shell variables:
  set
• Mark variables that are modified or created for export:
  set -a
• Notify of job termination immediately:
  set -b
• Set various options, e.g. enable vi style line editing:
  set -o {{vi}}
• Set the shell to exit as soon as the first error is encountered (mostly used in scripts):
  set -e