1.pm2 link 1o4p646z2dcq530 az6sum0tfgm9zgc
-bash: /home/hustwx/.npm-global/bin/pm2: Permission denied
2.chmod: /home/hustwx/.npm-global/bin/pm2/*: Permission denied
3.sudo chmod +x /home/hustwx/.npm-global/bin/pm2/*
-bash: /usr/local/bin/sudo: Permission denied
4.su
su: not running setuid
5.chmod 4755 /usr/bin/su
chmod: /usr/bin/su: Operation not permitted
