~ [2]$ echo $SHELL
/bin/sh
~ [3]$ ls -a
.  ..  .bash_logout  .bashrc  .kshrc  .profile  .sh_history  install.sh
~ [4]$ ./install.sh 
=> Downloading nvm from git to '/home/testuser/.nvm'
=> Cloning into '/home/testuser/.nvm'...
remote: Enumerating objects: 290, done.
remote: Counting objects: 100% (290/290), done.
remote: Compressing objects: 100% (257/257), done.
remote: Total 290 (delta 35), reused 97 (delta 20), pack-reused 0
Receiving objects: 100% (290/290), 163.27 KiB | 5.27 MiB/s, done.
Resolving deltas: 100% (35/35), done.
=> Compressing and cleaning up git repository

=> Appending nvm source string to /home/testuser/.kshrc
=> bash_completion source string already in /home/testuser/.kshrc
=> Close and reopen your terminal to start using nvm or run the following to use it now:

export NVM_DIR="$HOME/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
~ [5]$ ksh
/home/testuser/.kshrc[95]: .[3801]: local: local can only be used in a function
/home/testuser/.kshrc[95]: .[3771]: local: local can only be used in a function
/home/testuser/.kshrc[95]: .[981]: local: local can only be used in a function
/home/testuser/.kshrc[95]: .[3773]: local: local can only be used in a function
/home/testuser/.kshrc[95]: .[3775]: local: local can only be used in a function
~ [6]$ command -v nvm
nvm