bzegrep, bzfgrep, rgrep, zegrep, zgrep: move from linux to common (#8709)

grep alternatives work substantially the same on all major platforms.

pages/common/zegrep.md

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+# zegrep
+
+> Find extended regular expression patterns in compressed files using `egrep`.
+> More information: <https://www.unix.com/man-page/freebsd/1/zegrep/>.
+
+- Search for extended regular expressions (supporting `?`, `+`, `{}`, `()` and `|`) in a compressed file (case-sensitive):
+
+`zegrep "{{search_pattern}}" {{path/to/file}}`
+
+- Search for extended regular expressions (supporting `?`, `+`, `{}`, `()` and `|`) in a compressed file (case-insensitive):
+
+`zegrep --ignore-case "{{search_pattern}}" {{path/to/file}}`
+
+- Search for lines that do not match a pattern:
+
+`zegrep --invert-match "{{search_pattern}}" {{path/to/file}}`
+
+- Print file name and line number for each match:
+
+`zegrep --with-filename --line-number "{{search_pattern}}" {{path/to/file}}`
+
+- Search for lines matching a pattern, printing only the matched text:
+
+`zegrep --only-matching "{{search_pattern}}" {{path/to/file}}`
+
+- Recursively search files in a compressed file for a pattern:
+
+`zegrep --recursive "{{search_pattern}}" {{path/to/file}}`