Update cheatsheets

grep

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# grep
+
+> Find patterns in files using regular expressions.
+> More information: <https://www.gnu.org/software/grep/manual/grep.html>.
+
+- Search for a pattern within a file:
+
+`grep "{{search_pattern}}" {{path/to/file}}`
+
+- Search for an exact string (disables regular expressions):
+
+`grep --fixed-strings "{{exact_string}}" {{path/to/file}}`
+
+- Search for a pattern in all files recursively in a directory, showing line numbers of matches, ignoring binary files:
+
+`grep --recursive --line-number --binary-files={{without-match}} "{{search_pattern}}" {{path/to/directory}}`
+
+- Use extended regular expressions (supports `?`, `+`, `{}`, `()` and `|`), in case-insensitive mode:
+
+`grep --extended-regexp --ignore-case "{{search_pattern}}" {{path/to/file}}`
+
+- Print 3 lines of context around, before, or after each match:
+
+`grep --{{context|before-context|after-context}}={{3}} "{{search_pattern}}" {{path/to/file}}`
+
+- Print file name and line number for each match with color output:
+
+`grep --with-filename --line-number --color=always "{{search_pattern}}" {{path/to/file}}`
+
+- Search for lines matching a pattern, printing only the matched text:
+
+`grep --only-matching "{{search_pattern}}" {{path/to/file}}`
+
+- Search `stdin` for lines that do not match a pattern:
+
+`cat {{path/to/file}} | grep --invert-match "{{search_pattern}}"`