sed: edit page and add example (#16868)

* sed: edit page and add example

---------

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

pages/linux/sed.md

@@ -1,33 +1,37 @@
 # sed
 
-> Edit text in a scriptable manner.
+> GNU stream editor for filtering and transforming text.
 > See also: `awk`, `ed`.
 > More information: <https://www.gnu.org/software/sed/manual/sed.html>.
 
-- Replace all `apple` (basic regex) occurrences with `mango` (basic regex) in all input lines and print the result to `stdout`:
+- Replace `apple` with `mango` on all lines using basic regex, print to `stdout`:
 
 `{{command}} | sed 's/apple/mango/g'`
 
-- Replace all `apple` (extended regex) occurrences with `APPLE` (extended regex) in all input lines and print the result to `stdout`:
+- Replace `apple` with `APPLE` on all lines using extended regex, print to `stdout`:
 
 `{{command}} | sed {{[-E|--regexp-extended]}} 's/(apple)/\U\1/g'`
 
-- Replace all `apple` (basic regex) occurrences with `mango` (basic regex) in a specific file and overwrite the original file in place:
+- Use basic regex to replace `apple` with `mango` and `orange` with `lime` in-place in a file (overwriting original file):
 
-`sed {{[-i|--in-place]}} 's/apple/mango/g' {{path/to/file}}`
+`sed {{[-i|--in-place]}} -e 's/apple/mango/g' -e 's/orange/lime/g' {{path/to/file}}`
 
-- Execute a specific script file and print the result to `stdout`:
+- Execute a specific `sed` script file and print the result to `stdout`:
 
 `{{command}} | sed {{[-f|--file]}} {{path/to/script.sed}}`
 
-- Print just the first line to `stdout`:
+- [p]rint only the first line to `stdout`:
 
 `{{command}} | sed {{[-n|--quiet]}} '1p'`
 
-- [d]elete the first line of a file:
+- [d]elete lines 1 to 5 of a file and back up the original file with a `.orig` extension:
 
-`sed {{[-i|--in-place]}} 1d {{path/to/file}}`
+`sed {{[-i|--in-place=]}}{{.orig}} '1,5d' {{path/to/file}}`
 
-- [i]nsert a new line at the first line of a file:
+- [i]nsert a new line at the beginning of a file, overwriting the original file in-place:
 
 `sed {{[-i|--in-place]}} '1i\your new line text\' {{path/to/file}}`
+
+- Delete blank lines (with or without spaces/tabs) from a file, overwriting the original file in-place:
+
+`sed {{[-i|--in-place]}} '/^[[:space:]]*$/d' {{path/to/file}}`