egrep: add page (#6737)

pages/common/egrep.md

@@ -0,0 +1,28 @@
+# egrep
+
+> Find patterns in files using extended regular expression (supports `?`, `+`, `{}`, `()` and `|`).
+> More information: <https://manned.org/egrep>.
+
+- Search for a pattern within a file:
+
+`egrep "{{search_pattern}}" {{path/to/file}}`
+
+- Search for a pattern within multiple files:
+
+`egrep "{{search_pattern}}" {{path/to/file1}} {{path/to/file2}} {{path/to/file3}}`
+
+- Search stdin for a pattern:
+
+`cat {{path/to/file}} | egrep {{search_pattern}}`
+
+- Print file name and line number for each match:
+
+`egrep --with-filename --line-number "{{search_pattern}}" {{path/to/file}}`
+
+- Search for a pattern in all files recursively in a directory, ignoring binary files:
+
+`egrep --recursive --binary-files={{without-match}} "{{search_pattern}}" {{path/to/directory}}`
+
+- Search for lines that do not match a pattern:
+
+`egrep --invert-match "{{search_pattern}}" {{path/to/file}}`