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This question already has an answer here:

How to track disk usage (write/read and other cool stuff) in realtime with fashion of top in the only right system in shell?

It would be cool if it could monitor specific directory.

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marked as duplicate by slhck Feb 23 '13 at 23:05

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

up vote 19 down vote accepted

There's a tool (top like) to track I/O :

iotop -oPa

enter image description here

$ apt-cache show iotop
Description-en: simple top-like I/O monitor
 iotop does for I/O usage what top(1) does for CPU usage. It watches I/O
 usage information output by the Linux kernel and displays a table of
 current I/O usage by processes on the system. It is handy for answering
 the question "Why is the disk churning so much?".
 iotop can only run under a Linux 2.6.20 or later kernel built with the
 CONFIG_VM_EVENT_COUNTERS build config options on.
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