while executing sh tftp-script.sh it is getting something like:

s@s-desktop:~/home/work$ sudo chmod +x tftp-script.sh

s@s-desktop:~/home/work$ sh tftp-script.sh

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WELCOME TO RUGGED BOARD

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mkdir: cannot create directory ‘/var/lib/tftpboot’: Permission denied

chmod: cannot access '/var/lib/tftpboot': No such file or directory

chown: cannot access '/var/lib/tftpboot': No such file or directory

tftp-script.sh: 13: tftp-script.sh: cannot create /etc/xinetd.d/tftp: Permission denied

mkdir: cannot create directory ‘/nfsroot’: Permission denied

tftp-script.sh: 34: tftp-script.sh: cannot create /etc/exports: Permission denied

exportfs: could not open /var/lib/nfs/.etab.lock for locking: errno 13 (Permission denied)

exportfs: can't lock /var/lib/nfs/etab for writing

[ ok ] Restarting nfs-kernel-server (via systemctl): nfs-kernel-server.service.

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TFTP & NFS SETUP has been done