[root@ob1 scripts]# cat -An tt2.txt
1 jeyry$
2      ^I$
3 jfdkjfdjk$
4 ^Ikjfdkjfdkj$
5      klfdklfdkl$
6 fdjkkjf dfj ^Ifkdjkjf$
7 ^I$
8 ffdkkjfd$

[root@ob1 scripts]# sed -rn '/^[ \t]*$/!s#^[ \t]*##gp' tt2.txt
jeyry
jfdkjfdjk
kjfdkjfdkj
klfdklfdkl
fdjkkjf dfj  fkdjkjf
ffdkkjfd

==============================================

[root@ob1 scripts]# cat -An tt2.txt
1 jeyry$
2      ^I$
3 jfdkjfdjk$
4 ^Ikjfdkjfdkj$
5      klfdklfdkl$
6 fdjkkjf dfj ^Ifkdjkjf$
7 ^I$
8 ffdkkjfd$
9 $
10 $
11 dfyufudjhdf$
12    $
13 jkfjkdf$
14      $
[root@ob1 scripts]# sed -rn '/^[ \t]*$/!s#^[ \t]*##gp' tt2.txt
jeyry
jfdkjfdjk
kjfdkjfdkj
klfdklfdkl
fdjkkjf dfj  fkdjkjf
ffdkkjfd
dfyufudjhdf
jkfjkdf