Update cheatsheets

tldr/readarray

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# readarray
+
+> Read lines from `stdin` into an array.
+> More information: <https://www.gnu.org/software/bash/manual/bash.html#index-readarray>.
+
+- Interactively input lines into an array:
+
+`readarray {{array_name}}`
+
+- Read lines from a file and insert them in an array:
+
+`readarray {{array_name}} < {{path/to/file.txt}}`
+
+- Remove trailing deliminators (newline by default):
+
+`readarray -t {{array_name}} < {{path/to/file.txt}}`
+
+- Copy at most the specified number of lines:
+
+`readarray -n {{N}} {{array_name}} < {{path/to/file.txt}}`