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Calculate MD5 cryptographic checksums.

# To calculate the MD5 checksum for a file:
md5sum <path/to/file>

# To calculate MD5 checksums for multiple files:
md5sum <path/to/file1> <path/to/filen2>

# To read a file of MD5SUMs and verify all files have matching checksums:
md5sum -c <path/to/file.md5>

# To calculate a MD5 checksum from the standard input:
echo "<text>" | md5sum