ls - this is a list of information about the file/files.
ls -la - this is ls however it uses a long listing format (l), and does not hide entries starting with "." (a).
pwd - this prints the working directory. It shows the current folder as an absolute path.
cd . - this changes the working directory to present working directory. It seems to be of no use as this will change the directory to present directory itself.
cd .. - this changes the working directory to the parent directory (the directory that contains it).
man man - the man command is used to format and display the man pages. They are a user manual. man man displays the man page about the man pages [why does this remind me of Inception?].
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