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$ which iostat

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$ whereis iostat

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$ sudo apt update && sudo apt upgrade
$ sudo apt install plocate

$ locate iostat
$ locate example.txt
$ locate [example]	# Search partial matches
$ locate -i [Example]	# Case-insensitive
$ locate -n 5 filename
$ locate --regex -i "(\.mp4|\.avi)"

$ locate [filename] | wc -l
$ locate -c [filename]

$sudo updatedb
$locate [example] | grep "$(date +%Y-%m-%d)"

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$ sudo find / -name iostat

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$ command -v ssh

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$ type ssh
$ type sleep head
$ type -p pwd
$ type -a pwd
$ type -t grep

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$ readlink --version
$ readlink --help

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$ readlink -f $(which ssh)
$ readlink -e desk
$ readlink -m desk3
$ readlink -n desk4
$ readlink -q desk
$ readlink -s desk5
$ readlink -s desk5
$ readlink -z desk2