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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 303026259 by Corona688 on Thursday 22nd of November 2018 02:50:51 PM
Old 11-22-2018
Scripting changes to vital system files is very, very dangerous. Be sure you have a plan B in case that goes badly.

If I had to, I'd be paranoid and verify every part of the line.

Code:
awk '(NF==6)&&($1=="/dev/VolGroup00/tmp")&&($2=="/tmp")&&($3=="ext3")&&($4=="defaults"){ print $1,$2,$3,$4,1,1; next } 1' /etc/fstab > /tmp/fstab
# Uncomment once you've tested and are sure /tmp/fstab is what you want it to be.
# use cat, not mv, because mv may change permissions and ownership
# cat /tmp/fstab > /etc/fstab
rm -f /tmp/fstab

Last edited by Corona688; 11-22-2018 at 04:13 PM..
 

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LEARN ABOUT MINIX

fstab

FSTAB(5)							File Formats Manual							  FSTAB(5)

NAME

       fstab, mtab - list of file systems to mount, mounted file system table.

SYNOPSIS

       /etc/fstab

       /etc/mtab

DESCRIPTION

       /etc/fstab  is  a table of file system to mount at boot time, /etc/mtab is a table of currently mounted file systems as maintained by mount
       and umount.

       /etc/fstab is not read by mount as it should be.  It is instead a simple shell script listing the three devices that Minix needs  to  oper-
       ate:   The device names of the root file system, the temporary (scratch) file system, and the file system for /usr.  Of these only the /usr
       file system is mounted in /etc/rc, the scratch file system is there for the system administrator to test new kernels,  or  as  a  temporary
       file system.

       /etc/mtab contains lines of four fields.  The layout is:

	      device	directory    type    options

       These fields may be explained as follows:

       device
	      A block special device.

       directory
	      Mount point.

       type
	      Either 1, or 2, indicating a V1 or V2 file system.

       options
	      Either ro, or rw, indicating a read-only or read-write mounted file system.

FILES

       /etc/fstab     Shell script naming three important file systems.

       /etc/mtab      List of mounted file systems.

SEE ALSO

       printroot(8), mount(1), fsck(1), mkfs(1).

BUGS

       /etc/fstab is a joke.

AUTHOR

       Kees J. Bot (kjb@cs.vu.nl)

																	  FSTAB(5)
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