How to Execute Multiple Commands After Sudo Command

How to run two commands with sudo?

sudo can run multiple commands via a shell, for example:

$ sudo -s -- 'whoami; whoami'
root
root

Your command would be something like:

sudo -u db2inst1 -s -- "db2 connect to ttt; db2 UPDATE CONTACT SET EMAIL_ADDRESS = 'mytestaccount@gmail.com'"

If your sudo version doesn't work with semicolons with -s (apparently, it doesn't if compiled with certain options), you can use

sudo -- sh -c 'whoami; whoami'

instead, which basically does the same thing but makes you name the shell explicitly.

How to run multiple commands while using sudo as another user

Bash supports a -c flag that lets you specify the command to run as a command-line argument — basically an inline Bash script. That means you can easily combine multiple commands into a single call to bash, which is then easily sudo-ed:

sudo -i -u john.smith bash -c 'whoami ; cd /tmp/ ; ls -ltr'

or

sudo -i -u john.smith \
  bash -c ' whoami
            cd /tmp/
            ls -ltr
          '

(Other shell languages have the same feature.)

How to sudo su; then run command

Unless you have an unusual setup, you can't normally string su with other preceding commands like that. I would imagine it is running sudo su, then hanging in the root environment/session, because it's waiting for you to exit before preceding to the pm2 commands. Instead, I would consider something along the lines of this using the -c option:

CMD="sudo su -c 'pm2 restart 0; pm2 restart 1'"
ssh -i somepemfile.pem ubuntu@1.1.1.1 "$CMD"

As suggested in another answer, it would also probably be useful to encapsulate the $CMD variable in quotes in the ssh call.

Whats the best way to switch user and run multiple commands?

Running multiple commands separated by semicolons requires a shell. To get such shell features, you must invoke a shell like, in this case, bash:

sudo -u user bash -c 'command1; command2; command3; command4; command5' > out.log 2&1

Here, sudo -u user bash runs bash under user. The -c option tells bash which commands to run.

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