Hi
I have a question regarding awk.
I have a file that contains several lines:
/dev/vg1
/dev/blabla
/dev/vg01
/dev/blabla2
i need to merge a lines as following:
/dev/vg1:/dev/blabla
/dev/vg01:/dev/blabla2
Can somebody help me?

paste -d":" - - < your_filename_here

not working,
by the way the file can be appear as follows too:
/dev/vg1
/dev/blabla
/dev/vg01
/dev/blabla2
/dev/blabla3
/dev/blabla4

and it need to be composed as follows:
/dev/vg1:/dev/blabla
/dev/vg01:/dev/blabla2:/dev/blabla3:/dev/blabla4

while read line
do
curr=`echo $line |grep -i "vg"|wc -l|awk '{print $1}'`
if [ "$curr" = "1" ]
then
echo "\n$line\c"
else
echo ":$line\c"
fi
done < your_file_here

Thanks working

awk 'ORS=NR%2?":":"\n"' file

Tested with GNU Awk (I believe it should work with nawk on Solaris too):