How can I do this in Unix ?

[Rob Johnson_3]

I have a file that contains several hundred hostnames:
host1.domain.com
host2.domain.com
host3.domain.com
I need to put all hosts on one line and serate the name with a colon to look like this:
host1.domain.com:host2.domain.com:host4.domain.com.
How can I read the hostnames from a file and seperate them with a colon?

[H.Merijn Brand (procura · Accepted solution]

# perl -pe's/\n/:/' file

Enjoyn Have FUN! H.Merijn

[Rob Johnson_3]

That did it!

Thank you.

[Nguyen Anh Tien]

I just use:
#cat oldfile|awk '{printf("%s"":",$1)}'>newfile


HTH
tienna

[Marton Ferenc]

for i in `cat file`; do echo -n $i ""; done; echo;

[Arturo Galbiati]

Hi,
%cat tt
a
b
# change new line to ':'
%list=$(tr -s '\n' ':'
# Remove last ':'
echo ${list%%:}
a:b

HTH,
Art