What’s the best way to check if a volume is mounted in a Bash script?

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What’s the best way to check if a volume is mounted in a Bash script? What I’d really like is a method that I can use like this: if <something is mounted at /mnt/foo> then <Do some

Source: What’s the best way to check if a volume is mounted in a Bash script?

Avoid using /etc/mtab because it may be inconsistent.

Avoid piping mount because it needn’t be that complicated.

Simply:

if grep -qs '/mnt/foo' /proc/mounts; then
    echo "It's mounted."
else
    echo "It's not mounted."
fi