Bash script to download the lambda code and delete it

delete-lambda.sh

#Script to delete lambdas after downloading the code
#Accepts a new line delimited file with lambda names or ARNs
#Usage: log into the AWS account on the command line
# delete-lambda.sh <filename>

while IFS="" read -r p || [ -n "$p" ]; 
do

if [ -z $1 ]; then
        echo "Error: must supply a filename with line delimited values"
        echo "Usage: delete-lambda.sh <filename>"
        exit 1
fi

timestamp=$(date +%s)


printf '%s' "Downloading code for $p"
printf "\n\n";

aws lambda get-function --function-name "$p" --query 'Code.Location' |xargs wget -q -O "$p-$timestamp-code.zip"

printf '%s' "Deleting lambda: $p"; 
printf "\n\n";

if [ $? -eq 0 ]; then
    aws lambda delete-function --function-name "$p"
else
    echo "Code download failed, lambda not deleted"
fi

done < lambdas.txt