in bash and xargs loop on nlines after pipe

Question

Team, my below command, greps for any pods with problems then takes them one by one and deletes.

But I want to use only first 10 lines of my command output.

kubectl get pods --all-namespaces | grep -i -e Evict -e Error | 
    awk -F ' ' '{print $1, $2, $4}' | 
    xargs -l1 -- sh -c 'kubectl delete pod "$2" -n "$1"' --

above command is deleting for all rows but i want to do only for first 10 rows. any hint?

i tried

kubectl get pods --all-namespaces | grep -i -e Evict -e Error | 
    awk -F ' ' '{print $1, $2, $4}' | for run{1..10}; do 
        xargs -l1 -- sh -c 'kubectl delete pod "$2" -n "$1" ' --; 
    done

once, i know this, i can use it for any command node or pod.

Answer 1

You can use head to get the first 10 lines of output before passing to xargs. Use the -n option to specify how many lines (in this case, head -n10)

Just before piping to xargs, insert the following: | head -n10 |. This will filter everything but the first ten lines of preceding output.

Try this:

kubectl get pods --all-namespaces | grep -i -e Evict -e Error | awk -F ' ' '{print $1, $2, $4}' | head -n10 | xargs -l1 -- sh -c 'kubectl delete pod "$2" -n "$1"' --