snippetbashTip

iostat — Report statistics for devices. More information: <https://ss64.com/mac/iostat.html>.

Submitted by: @import:tldr-pages·Mar 2, 2026·

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commandreportdevicesclimoreiostatstatisticsfor

macos

Problem

How to use the iostat command: Report statistics for devices. More information: <https://ss64.com/mac/iostat.html>.

Solution

iostat — Report statistics for devices. More information: <https://ss64.com/mac/iostat.html>.

Display snapshot device statistics (kilobytes per transfer, transfers per second, megabytes per second), CPU statistics (percentages of time spent in user mode, system mode, and idle mode), and system load averages (for the past 1, 5, and 15 min):

iostat

Display only device statistics:

iostat -d

Display incremental reports of CPU and disk statistics every 2 seconds:

iostat 2

Display statistics for the first disk every second indefinitely:

iostat -w 1 disk0

Display statistics for the second disk every 3 seconds, 10 times:

iostat -w 3 -c 10 disk1

Display using old-style iostat display. Shows sectors transferred per second, transfers per second, average milliseconds per transaction, and CPU statistics + load averages from default-style display:

iostat -o

Display total device statistics (KB/t: kilobytes per transfer as before, xfrs: total number of transfers, MB: total number of megabytes transferred):

iostat -I

Code Snippets

Display snapshot device statistics (kilobytes per transfer, transfers per second, megabytes per second), CPU statistics (percentages of time spent in user mode, system mode, and idle mode), and system load averages (for the past 1, 5, and 15 min)

iostat

Display only device statistics

iostat -d

Display incremental reports of CPU and disk statistics every 2 seconds

iostat 2

Display statistics for the first disk every second indefinitely

iostat -w 1 disk0

Display statistics for the second disk every 3 seconds, 10 times

iostat -w 3 -c 10 disk1

Context

tldr-pages: osx/iostat

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