With is a CLI to execute any shell command with multiple variables concurrently. xargs is a similar utility. Place the this keyword anywhere in your command and with will iterate through all the input values, replace this with a value and execute the resulting command.

If you have multiple this in your command, each one will be replaced (todo: this should be controllable in a future release using flags).

If you don't place this in your target command, then with will iterate the same command n times where n equals the number of items in your --values input.

In case of errors, with will only report and continue with the remaining iterations/values.

$ brew install amritb/tap/with-this

You can build it from source using go build and put it in your $PATH.

$ go build main.go -o with

with --values "$(INPUT)" "COMMAND"

Flags:
  -h, --help            help for with
  -v, --values string   Iterate with these values
      --version         version for with

You have a list of URLs in a text file and want to curl all of them in parallel, with one command:

$ with -v "$(cat myurls.txt)" "curl -L this"

You want to quickly check AWS instance status for all the regions:

$ with -v "$(cat myregions.txt)" "aws --region=this ec2 describe-instance-status"

You have a directory with lots of kubeconfig files and want to get pods from all the different clusters using kubectl command:

$ with -v "$(ls | grep config)" "kubectl --kubeconfig=this get pods"

Run the exact same command 10 times in parallel:

$ with -v "$(echo {1..10})" "echo 123"