[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