Update cheatsheets

b2sum

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# b2sum
+
+> Calculate BLAKE2 cryptographic checksums.
+> More information: <https://www.gnu.org/software/coreutils/b2sum>.
+
+- Calculate the BLAKE2 checksum for one or more files:
+
+`b2sum {{path/to/file1 path/to/file2 ...}}`
+
+- Calculate and save the list of BLAKE2 checksums to a file:
+
+`b2sum {{path/to/file1 path/to/file2 ...}} > {{path/to/file.b2}}`
+
+- Calculate a BLAKE2 checksum from `stdin`:
+
+`{{command}} | b2sum`
+
+- Read a file of BLAKE2 sums and filenames and verify all files have matching checksums:
+
+`b2sum --check {{path/to/file.b2}}`
+
+- Only show a message for missing files or when verification fails:
+
+`b2sum --check --quiet {{path/to/file.b2}}`
+
+- Only show a message when verification fails, ignoring missing files:
+
+`b2sum --ignore-missing --check --quiet {{path/to/file.b2}}`