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update readme.md

found out more about usage of history command on redhat.com, added this to the repo readme
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alpcentaur 2 years ago
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## history ## history
this lists all the commands of the shell you are in, that you have typed in lastly. this lists all the commands of the shell you are in, that you have typed in lastly.
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.
## grep ## grep

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