On Fri, May 23, 2008 at 11:41 AM, Scott McClanahan <SMcClanahan at forterrainc.com> wrote: > Not specific to CentOS but I know you guys would be really helpful anyhow. > Basically, I have a file which has been editted in the past very similarly > to the hosts file only now I want to use it as a hosts file and need to run > some fancy sed to massage the data into shape. Currently, the data in the > file is in the form of <ip address> <tab> <short hostname> <space> <short > hostname alias>. In some cases there may not be any aliases so the end of > line would be right after the short hostname (no space at the end either). > In other cases there could be many space separated short hostname aliases. > What I have been trying to do without success is add our domain name to the > first string after the ip address and tab character. As an example, > > == Before == > > 1.1.1.1 foo > 10.10.10.10 bar bar2 > 100.100.100.100 foobar foobar2 foobar3 > > > == After == > > 1.1.1.1 foo.contoso.com > 10.10.10.10 bar.contoso.com bar2 > 100.100.100.100 foobar.contoso.com foobar2 foobar3 > > Any advice on how to pull this off? Thanks. I'd use awk. Put the lines in a file, then do this cat test.txt | awk '{ print $1 "\t" $2 ".centos.com\t" $3 "\t" $4 }' -- -matt