update readme.md
found out more about usage of history command on redhat.com, added this to the repo readme
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## history
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this lists all the commands of the shell you are in, that you have typed in lastly.
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The list consists of the command plus the a number. After have issued history (ususally filtered by grep with piping - see next chapter) you can directly issue one of the displayed commands WITHOUT using the mouse, by entering the an exclamation mark followed by the number of the command.
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## grep
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