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What happens when you store the following aliases in ~/.bash_profile?

alias hy="history"

hy is set as alias for the history command in the bash profile. The alias is then made available in the current session through source. By typing hy, the command line outputs a history of commands that were entered in the current session.

alias ll="ls -la"

ll is set as an alias for ls -la and made available in the current session through source. By typing ll, the command line now outputs all contents and directories in long format, including all hidden files.

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