Text manipulation 'sed'

1. #sed 's/string1/string2/g'
(Replace string1 with string2)

2. #sed 's/\(.*\)1/\12/g'
(Modify anystring1 to anystring2)

3. #sed '/ *#/d; /^ *$/d'
(Remove comments and blank lines)

4. #sed ':a; /\\$/N; s/\\\n//; ta'
(Concatenate lines with trailing \)

5. #sed 's/[ \t]*$//'
(Remove trailing spaces from lines)

6.# sed 's/\([`"$\]\)/\\\1/g'
(Escape shell metacharacters active within double quotes)

7.#seq 10 | sed "s/^/ /; s/ *\(.\{7,\}\)/\1/"
(Right align numbers)

8.#sed -n '1000p;1000q'
(Print 1000th line)

9.#sed -n '10,20p;20q'
(Print lines 10 to 20)

10. #sed -n 's/.*