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date +%s | sha256sum | base64 | head -c 32 ; echo
date +%s : will print the system date and time in seconds since 1970-01-01 00:00:00 UTC
sha256sum : will compute the SHA256 message digest of the time in seconds we produced before
base64 : will encode the previous data and print them to standard output
head -c 32 : will print the first 32 characters of the previous data
; echo : is used to create a new line at the end of the results