Shell Script to find newly added pods in kubernetes on day basics

Your script has numerous issues and inefficiencies. Repeatedly calling a somewhat heavy command like kubectl should be avoided; try to rearrange things so that you only run it once, and extract the information you need from it. I'm vaguely guessing you actually want something along the lines of

#!/bin/bash# Store pod names in an array  pods=($(kubectl get pods |    awk 'NR>1 { printf sep $1; sep=" "}'))if [ ${#pods[@]} -gt $n ]; then  # $n is still undefined!    for pod in "${pods[@]}"; do        kubectl describe pod "$pod" |        awk -v dt="$(date +"%a, %d %b %Y")" '            /SecretName:/ { next }            /Name:/ { name=$NF }            /Start Time:/ { t=$3 $4 $5 $6;                if (t==dt) print name                name="" }'    donefi

Once you run Awk anyway, it makes sense to refactor as much as the processing into Awk; it can do everything grep and cut and sed can do, and much more. Notice also how we use the $(command) command substitution syntax in preference over the obsolescent legacy `command` syntax.

kubectl with -o=json would probably be a lot easier and more straightforward to process programmatically so you should really look into that. I don't have a Kubernetes cluster to play around with so I'm only pointing this out as a direction for further improvement.