When comparing checksums on files, it's good to know the checksum for the empty file to make sure you're not getting null data back from some command. This is a quick way to generate it to be sure.printf "" | sha1sum
@climagic What about `sha1sum </dev/null`? ;)
@khardix @climagic Should work, too. But the null command ":" is even shorter:
: | sha1sum
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