Update cheatsheets

linux/datamash

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# datamash
+
+> Perform basic numeric, textual and statistical operations on input textual data files.
+> More information: <http://www.gnu.org/software/datamash/>.
+
+- Get max, min, mean and median of a single column of numbers:
+
+`seq 3 | datamash max 1 min 1 mean 1 median 1`
+
+- Get the mean of a single column of float numbers (floats must use "," and not "."):
+
+`echo -e '1.0
+2.5
+3.1
+4.3
+5.6
+5.7' | tr '.' ',' | datamash mean 1`
+
+- Get the mean of a single column of numbers with a given decimal precision:
+
+`echo -e '1
+2
+3
+4
+5
+5' | datamash -R {{number_of_decimals_wanted}} mean 1`
+
+- Get the mean of a single column of numbers ignoring "Na" and "NaN" (literal) strings:
+
+`echo -e '1
+2
+Na
+3
+NaN' | datamash --narm mean 1`