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linux
Tracing a packet journey
Good example for generating password using different wrappers or bindings of the crypt() function
I use this to manually change password in /etc/shadow for users created only as opensmtpd users which has no shell access (/usr/sbin/nologin)
The quickest way, using python3 is:
python -c 'import crypt; print(crypt.crypt("password",crypt.METHOD_SHA512))'
Corso di Sistemi Operativi di Marco Cesati
Workaround for external servers unable to connect to my home server