Nitche bash commands to use

I use a lot of scripting for my daily stuffs. I had listed a collection of commands that are useful to me and guess is useful to everyone else reading this blog.
The stuffs below are collected from different sources but i have tested them for working conditions.
If there are any other ways of doing the same thing, please comment.

1. Connect via ssh using mac address
ssh root@’for ((i=100; i<=110; i++));do arp -a 192.168.1.$i; done | grep 00:35:cf:56:b2:2g |
awk ‘{print $2}’ | sed -e ‘s/(//’ -e ‘s/)//

2. Show directories in the PATH, one each line
echo $PATH | tr \: \\n

3. Check your unred yahoo mail with wget
wget -q -O – –load-cookies=cookies.txt “
fid=Inbox&order=down&pSize=25″ | sed ‘s/<[^>]*>/\n/g’ | grep ‘.’ | awk ‘/^Unread$/,/KB$/’ |
grep -v ‘&nbsp’ | sed ‘s/^Unread$/===============/’

4. Rip VCD
cdrdao read-cd –device ATA:1,1,0 –driver generic-mmc-raw –read-raw image.toc

5. Check your gmail from the command line
curl -u username –silent “” |
perl -ne ‘print “\t” if /<name>/; print “$2\n” if /<(title|name)>(.*)<\/\1>/;’

6. Remove html tags from a file
sed ‘s/<[^>]*>//g’ index.html

7. Make ISO file using the dd command
dd if=/dev/cdrom of=output.iso

8. Watch the load average of your computer
watch ‘cat /proc/loadavg’

9. List all harddisk partitions
fdisk -l |grep -e ‘^/’ |awk ‘{print $1}’|sed -e “s|/dev/||g”

10. Reinstall Grub
sudo grub-install –recheck /dev/sda1

11. Flash emergency signals from your computer
while true; do xset dpms force off; sleep 0.3; xset dpms force on; xset s reset; sleep 0.3; done

12. Scan all active ip addresses in your network
arp-scan -l

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