for disk in $(lsblk -d -o name | grep -E '^sd|^nvme'); do
Good:
while IFS= read -r disk; do -z "$disk" && continue
done < <(lsblk -d -o name | grep -E '^sd|^nvme')
# Bad:
for disk in $(lsblk -d -o name | grep -E '^sd|^nvme'); do
# Good:
while IFS= read -r disk; do
[[ -z "$disk" ]] && continue
done < <(lsblk -d -o name | grep -E '^sd|^nvme')
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Bad:
for disk in $(lsblk -d -o name | grep -E '^sd|^nvme'); do
Good:
while IFS= read -r disk; do
-z "$disk" && continue
done < <(lsblk -d -o name | grep -E '^sd|^nvme')