Update cheatsheets

pr

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pr
+
+> Paginate or columnate files for printing.
+> More information: <https://www.gnu.org/software/coreutils/pr>.
+
+- Print multiple files with a default header and footer:
+
+`pr {{path/to/file1 path/to/file2 ...}}`
+
+- Print with a custom centered header:
+
+`pr -h "{{header}}" {{path/to/file1 path/to/file2 ...}}`
+
+- Print with numbered lines and a custom date format:
+
+`pr -n -D "{{format}}" {{path/to/file1 path/to/file2 ...}}`
+
+- Print all files together, one in each column, without a header or footer:
+
+`pr -m -T {{path/to/file1 path/to/file2 ...}}`
+
+- Print, beginning at page 2 up to page 5, with a given page length (including header and footer):
+
+`pr +{{2}}:{{5}} -l {{page_length}} {{path/to/file1 path/to/file2 ...}}`
+
+- Print with an offset for each line and a truncating custom page width:
+
+`pr -o {{offset}} -W {{width}} {{path/to/file1 path/to/file2 ...}}`