add that alias to your "~/.bashrc" file code example

Example 1: linux permanent alias

printf "%s\n" "alias shh='sqlplus hfdora/hfdora@hfd1" >> ~/.bashrc
source ~/.bashrc # for immediate effect

#or add your alias to ~/.bashrc directly

Example 2: bash new alias

# syntax
# alias *<alias-name>="*<what-alias-represents>"

# example
alias ll="ls -lrt"