Update cheatsheets

tr

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# tr
+
+> Translate characters: run replacements based on single characters and character sets.
+> More information: <https://www.gnu.org/software/coreutils/tr>.
+
+- Replace all occurrences of a character in a file, and print the result:
+
+`tr {{find_character}} {{replace_character}} < {{path/to/file}}`
+
+- Replace all occurrences of a character from another command's output:
+
+`echo {{text}} | tr {{find_character}} {{replace_character}}`
+
+- Map each character of the first set to the corresponding character of the second set:
+
+`tr '{{abcd}}' '{{jkmn}}' < {{path/to/file}}`
+
+- Delete all occurrences of the specified set of characters from the input:
+
+`tr -d '{{input_characters}}' < {{path/to/file}}`
+
+- Compress a series of identical characters to a single character:
+
+`tr -s '{{input_characters}}' < {{path/to/file}}`
+
+- Translate the contents of a file to upper-case:
+
+`tr "[:lower:]" "[:upper:]" < {{path/to/file}}`
+
+- Strip out non-printable characters from a file:
+
+`tr -cd "[:print:]" < {{path/to/file}}`