[Ilugc] Removing Blank lines and same file has to be affected
- From: gopal@xxxxxxxxxxxxxxxxx (Gopalarathnam Venkatesan)
- Date: Wed Aug 16 17:51:35 2006
Girish Venkatachalam wrote:
sed -n -i '/^$/!p' file1.txt
Good. In this particular this gives exactly what you
want.
But in general for generic in place editing and text
munching the "perl -pi" route seems to be the only
way
out.
Otherwise it is impossible to do in place editing.
Sorry I was wrong. The -i flag to sed clearly implies
in place editing.
Yes, but the "-i" option in sed is non standard and is not available on
all operating systems.
Either Perl works here, or ed(1) can be used.
shell> ed file1.txt
1,$s/^$/d
w
q
If this needs to be written as part of a program, then the following can
be used:
ed file1.txt <<!
1,$s/^$/d
w
q
!
--
Gopalarathnam Venkatesan
http://gopalarathnam.com/
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