miro@miro-ntb:Downloads$ cat fstab.txt 

#
# /etc/fstab
# Created by anaconda on Mon Feb 14 16:03:26 2011
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/VolGroup-lv_root /                       ext4    defaults        1 1
UUID=10cb97f9-e52e-472b-a20b-c1e90c6d561b /boot                   ext4    defaults        1 2
/dev/mapper/VolGroup-lv_swap swap                    swap    defaults        0 0
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
miro@miro-ntb:Downloads$ { rm fstab.txt && awk '
BEGIN{while ( (getline < "partlist.txt")>0) { 
gsub(/\r|"/,""); a[$3]=$2;}
}
{
for(i in a) { if($2==i){$1="UUID=" a[i]}}; 
print $0;
}' > fstab.txt; } < fstab.txt
miro@miro-ntb:Downloads$ cat fstab.txt 

#
# /etc/fstab
# Created by anaconda on Mon Feb 14 16:03:26 2011
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=f75b104c-678e-4f80-a618-70d4bf4a3ede / ext4 defaults 1 1
UUID=psb8767c-678e-4f80-a618-70d4bf4a3ede /boot ext4 defaults 1 2
/dev/mapper/VolGroup-lv_swap swap                    swap    defaults        0 0
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0