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Asked: 2026-06-13T21:40:40+00:00

This line is inside my /etc/rc.sysinit file on linux: [ -r /proc/mdstat -a -r

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This line is inside my /etc/rc.sysinit file on linux: 

[ -r /proc/mdstat -a -r /dev/md/md-device-map ] && /sbin/mdadm -IRs

I’m not so much interested in what it actually accomplishes as opposed to how the syntax works.

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  1. Editorial Team

    It tests if the files /proc/mdstat and /dev/md/md-device-map exists and are readable (-r), and if yes executes /sbin/mdadm -IRs.

    The square brackets are an alternative name of the program test (or a Bash replacement thereof), which can test for lots of stuff, such as existence of files. The -a is a logical “and”.

    For more details, see “CONDITIONAL EXPRESSIONS” in man bash.

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