Create ISO in pendrive Linux

Get pendrive address (/dev/sdX)
lsblk -S | awk '$NF ~ /usb$/ {print $1}'

Use dd to send ISO to pendrive
dd if=/image.iso of=/dev/sdb bs=4096

View expiration date of DNSSEC signature

  dig SOA yourdomain.com @nameserver +dnssec  

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