Exec Command

Execute an arbitrary command in each package.

melos exec
# e.g. melos exec -- pub global run tuneup check

The command is executed in a shell. On Windows the shell is cmd.exe and on all other platforms it is sh.

If multiple commands are being executed and no further commands should be executed after a command has failed, connect the commands with &&:

melos exec -- "melos bootstrap && melos run build"

It is important to pass multiple commands as a single string to melos exec, otherwise the shell will pass only the first command to melos exec.

Defines the max concurrency value of how many packages will execute the command in at any one time. Defaults to 5.

# Set a 1 concurrency
melos exec -c 1  -- "dart analyze ."

Whether exec should fail fast and not execute the script in further packages if the script fails in an individual package. Defaults to false.

# Fail fast
melos exec --fail-fast -- "dart analyze ."

When executing a command in multiple packages concurrently, the output of the packages is streamed as it is produced, which means the logs of the different packages are interleaved and hard to follow.

With --group-logs, the output of each package is buffered instead and printed once every package has finished, grouped per package and in the order the output was produced. Packages in which the command failed are printed last, so failures are at the end of the log where they are easy to spot. Defaults to false.

The flag only has an effect when the command runs in more than one package with a concurrency greater than 1. When the command runs in a single package or with --concurrency 1, the output cannot interleave in the first place, so --group-logs is a no-op and the output is streamed as usual.

# Print the output grouped per package, once all packages have finished
melos exec --group-logs -- "dart analyze ."