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we want to check the filesystem on the disks as /deb/sdc .... /dev/sdg on each linux redhat machine

the target is to find what are the disks that required e2fsck ( as e2fsck -y /dev/sdb . etc )

according to man page

-n     Open  the filesystem read-only, and assume an answer of `no' to all questions.  Allows e2fsck to be used non-interactively.  This option may not be specified at
          the same time as the -p or -y options.

when we run the command ( only example )

 e2fsck -n   /dev/sdXX

we get

e2fsck 1.42.9 (28-Dec-2013)
Warning!  /dev/sdc is mounted.
Warning: skipping journal recovery because doing a read-only filesystem check.
/dev/sdc: clean, 94/1310720 files, 156685/5242880 blocks

so what need to capture from e2fsck output , that required to run e2fsck ?

e2fsck process

init 1

umount /dev/sdXX

e2fsck -y /dev/sdXX  ( or e2fsck -C /dev/sdXX for full details ) 

init 3
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You probably are looking for the output of tune2fs rather than e2fsck

tune2fs -l /dev/sdXX |grep "Filesystem state\|Last checked\|Check interval"

which should yield something like this:

Filesystem state:         clean
Last checked:             Mon Nov 28 16:03:44 2016
Check interval:           31536000 (12 months)

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