Shell Programming and Scripting

ls /sys/class/scsi_device/ | while read i; do echo "- - -" > /sys/class/scsi_device/$i/device/rescan;done

lsblk
echo -e "o\nn\np\n1\n\n\nw" | fdisk /dev/sdd
partx -a /dev/sdd1
mkfs.ext4 /dev/sdd1
blkid  /dev/sdd1 | awk '{print $2}' | cut -d "\"" -f2
Finding the blkid of the disk and updating the /etc/fstab
echo "UUID=$(blkid -s UUID -o value /dev/sda1)" /root/abcd  ext4 defaults 0 0 >> /etc/fstab

ls /sys/class/scsi_device/ | while read i; do echo "- - -" > /sys/class/scsi_device/$i/device/rescan;done
b=$(lsblk | grep 6G|awk '{print $1}')
echo -e "o\nn\np\n1\n\n\nw" | fdisk /dev/$b
partx -a /dev/$b
mkfs.ext4 /dev/$b1
echo "UUID=$(blkid -s UUID -o value /dev/$b1)" /root/abcd  ext4 defaults 0 0 >> /etc/fstab

#!/bin/bash
# scan_add_fstab.sh
for i in /sys/class/scsi_device/*
do
  # must be a directory
  [ -d "$i" ] &&  echo "- - -" > "$i/device/rescan"
done
for b in $(lsblk -d | awk '$4=="6G" {print $1}')
do
  # jump to next loop cycle if /dev/$b is in fstab
  grep -q "^[^#]*/dev/$b\>" /etc/fstab && continue
  uuid=$(blkid -s UUID -o value /dev/$b)
  # jump to next loop cycle if its UUID is present and in fstab
  [ -n "$uuid" ] && grep -q "^[^#]*$uuid" /etc/fstab && continue
  # echo -e is discouraged, the echo options can differ between shells
  printf "o\nn\np\n1\n\n\nw\n" | fdisk /dev/$b
  partx -a /dev/$b
  mkfs.ext4 /dev/$b1
  uuid=$(blkid -s UUID -o value /dev/$b)
  echo "UUID=$uuid  /root/abcd  ext4 defaults 0 0" >> /etc/fstab
done

for i in server1 server2
do
  ssh -x "$i" "/bin/bash" < scan_add_fstab.sh
done

ls /sys/class/scsi_device/ | while read i; do echo "- - -" > /sys/class/scsi_device/$i/device/rescan;done

for i in /sys/class/scsi_device/*
do
  # must be a directory
  [ -d "$i" ] &&  echo "- - -" > "$i/device/rescan"
done

for i in /sys/class/scsi_device/*/device/rescan
do
  # unless nullglob is set, we must ensure it exists
  [ -e "$i" ] &&  echo "- - -" > "$i"
done