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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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GETFSENT(3)						     Library Functions Manual						       GETFSENT(3)

NAME
getfsent, getfsspec, getfsfile, getfstype, setfsent, endfsent - get file system descriptor file entry SYNOPSIS
#include <fstab.h> struct fstab *getfsent() struct fstab *getfsspec(spec) char *spec; struct fstab *getfsfile(file) char *file; struct fstab *getfstype(type) char *type; int setfsent() int endfsent() DESCRIPTION
Getfsent, getfsspec, getfstype, and getfsfile each return a pointer to an object with the following structure containing the broken-out fields of a line in the file system description file, <fstab.h>. struct fstab { char *fs_spec; char *fs_file; char *fs_type; int fs_freq; int fs_passno; }; The fields have meanings described in fstab(5). Getfsent reads the next line of the file, opening the file if necessary. Setfsent opens and rewinds the file. Endfsent closes the file. Getfsspec and getfsfile sequentially search from the beginning of the file until a matching special file name or file system file name is found, or until EOF is encountered. Getfstype does likewise, matching on the file system type field. FILES
/etc/fstab SEE ALSO
fstab(5) DIAGNOSTICS
Null pointer (0) returned on EOF or error. BUGS
All information is contained in a static area so it must be copied if it is to be saved. 4th Berkeley Distribution May 12, 1986 GETFSENT(3)
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