Bash If Else statement inside one line command

Question

I've got a case:

case $1 in
  "start") exec docker-compose up ;;
  "check-types") docker-compose run --rm myapp mypy --config-file=mypy.ini $2;;
  "help" | *) print-help ;;
esac

I would like to replace $2 written in "check-types" with an if statment which would state something similar to:

if [[ $2 ]]; then
  $2
else
  .
fi

Is that possible in one line of bash?

Example of the desired behavior:

writing ./cli check-types executes docker-compose run --rm myapp mypy --config-file=mypy.ini .
writing ./cli check-types app/test executes docker-compose run --rm myapp mypy --config-file=mypy.ini app/test

chepner · Accepted Answer · 2020-04-23 12:59:18Z

4

You can use the :- operator to specify a default value if $2 is null or unset.

case $1 in
  "start") 
    exec docker-compose up ;;
  "check-types")
    docker-compose run --rm myapp mypy --config-file=mypy.ini "${2:-.}";;
  "help" | *)
    print-help ;;
esac

(In general, though, bash does not have a conditional expression.)

answered Apr 23, 2020 at 12:59

chepner

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