The problem/use-case that the feature addresses

When running flushall from Jenkins CI one would expect that a failing command should fail the job. However, redis-cli returns 0 even if the command is not executed and thus the job is finished as OK.

# redis-cli flushall
NOPERM this user has no permissions to run the 'flushall' command or its subcommand

# echo $?
0

Description of the feature

Any exit code except for 0 is fine.

# redis-cli flushall
NOPERM this user has no permissions to run the 'flushall' command or its subcommand

# echo $?
1