sorting null values

Shell Programming and Scripting
1

Hi
I have a file with the values

abc
res

set
kls

lmn
ops

i want to sort this file with the null values at the bottom of the file

OUTPUT should look like this

abc
kls
lmn
ops
res
set
then the three NULL
2

Hello and welcome to the forums.

I cant be certain, because you didn't use code tags around you sample data, but the following solution assumes that those are empty lines (no spaces or tabs or other non-printing characters):

sort file | sed '/^$/{H;d;}; ${G;s/\n$//;}'

Regards,
Alister

3

Thanks Alister !
those are empty lines lets say that empty line contain tabs or space.
but i need those tab/space at the EOF.

Regards,
Vicky

4 
sort myFile | nawk '!NF{e[++nf]=$0}; NF; END{while(++i in e) print e}'
5

Thanks
That works perfectly

6 
sort  file   | sed '/^$/d' | sed -re '$s/(.*)/\1\n\n\n/'
7

Pardon the nitpick, but a line with spaces and tabs is not an empty line nor a null line. I mention it not to be pedantic but because using that wording to describe them is imprecise and may interfere with our abilitiy to deliver a quick and accurate solution. Non-empty blank lines is probably the most accurate term (isblank(3) returns true only for tab and space characters when using the standard C locale). The following solution handles empty lines (lines containing zero bytes) and lines consisting solely of any combination of blank characters.

sort file | sed '/^[[:blank:]]*$/{H;d;}; ${x;s/^\n//;x;G;}'

Cheers,
Alister