sed: show usage of a print command (#2154)

pages/common/sed.md

@@ -1,6 +1,6 @@
 # sed
 
-> Run replacements based on regular expressions.
+> Edit text in a scriptable manner.
 
 - Replace the first occurrence of a string in a file, and print the result:
 
@@ -18,6 +18,10 @@
 
 `sed '/{{line_pattern}}/s/{{find}}/{{replace}}/' {{filename}}`
 
+- Print only text between n-th line till the next empty line:
+
+`sed -n '{{line_number}},/^$/p' {{filename}}`
+
 - Apply multiple find-replace expressions to a file:
 
 `sed -e 's/{{find}}/{{replace}}/' -e 's/{{find}}/{{replace}}/' {{filename}}`