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Full Discussion: How to replace value in fstab file?
Top Forums Shell Programming and Scripting How to replace value in fstab file? Post 303026279 by chakrapani on Friday 23rd of November 2018 08:58:03 AM
Old 11-23-2018
May be add few steps like take a backup of file. and validate file.

First to make backup
Code:
[ ! -d "/root/fstab_backup" ] && mkdir /root/fstab_backup
cat /etc/fstab > /root/fstab_backup/fstab.${date +%j_%y}.BACKUP

Now to test it
Code:
mount -fav

Just make sure to check man pages on system to validate. Also run each command by itself and validate.
 

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LEARN ABOUT CENTOS

systemd-fstab-generator

SYSTEMD-FSTAB-GENERATOR(8)				      systemd-fstab-generator					SYSTEMD-FSTAB-GENERATOR(8)

NAME

       systemd-fstab-generator - Unit generator for /etc/fstab

SYNOPSIS

       /usr/lib/systemd/system-generators/systemd-fstab-generator

DESCRIPTION

       systemd-fstab-generator is a generator that translates /etc/fstab (see fstab(5) for details) into native systemd units early at boot and
       when configuration of the system manager is reloaded. This will instantiate mount and swap units as necessary.

       The <term>passno</term> field is treated like a simlpe boolean, and the ordering information is discarded. However, the root filesystem is
       checked before all the other filesystems.

       See systemd.mount(5) and systemd.swap(5) for more information about special /etc/fstab mount options this generator understands.

       systemd-fstab-generator implements the generator specification[1].

KERNEL COMMAND LINE

       systemd-fstab-generator understands the following kernel command line parameters:

       fstab=, rd.fstab=
	   Takes a boolean argument. Defaults to "yes". If "no", causes the generator to ignore any mounts or swaps configured in /etc/fstab.
	   rd.fstab= is honored only by initial RAM disk (initrd) while fstab= is honored by both the main system and the initrd.

SEE ALSO

       systemd(1), fstab(5), systemd.mount(5), systemd.swap(5), systemd-cryptsetup-generator(8)

NOTES

	1. generator specification
	   http://www.freedesktop.org/wiki/Software/systemd/Generators

systemd 208														SYSTEMD-FSTAB-GENERATOR(8)
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