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The crypt function takes a password, key, as a string, and a salt character array which is described below, and returns a printable ASCII string which starts with another salt. It is believed that, given the output of the function, the best way to find a key that will produce that output is to guess values of key until the original value of key is found.
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One should never enter a password into the command line. Chances are, it'll be saved in history, and, if the command takes a while, will show in the process list.
Well, I would complain about the use of perl first but... you can allways remove the line from the history file. useradd -m -p $(perl -e'print crypt("passwordscelta", "stigghiola")') user & history -d