Trying to print full line from a huge file that has \ (connector for lines)

Question

I am trying to collect lines from a file with the specific word host: for example the word host, I need to get output of all names of hosts. This is my file:

host= mx,rt,fd,rt,wed,asd, \
      fm, jklf,dfd,dfd
host = jd,er,ew,yu,tg,ed,ik,cs,\
       fd, gr, jy
host = mz,fg,jh

I am using :

$grep -i host filename | awk '{print $2}'

only works for the first line , it does not output any name after \

so the output is;

   mx,rt,fd,rt,wed,asd, \

   jd,er,ew,yu,tg,ed,ik,cs,\

    mz,fg,jh

as you see I am not getting rest of the line after \

I don't want to get rid of \ I would like to keep it, I can move it and connect all names, so it will be seen as one_line , but I don't want to do that.

Any idea , it is appreciated, it could be easy , but I can make it work, even when I use tr.

Answer 1

You could do:

 sed '
   # delete all but lines starting with host= (allowing blanks)
   /^[[:blank:]]*host[[:blank:]]*=[[:blank:]]*/!d

   # remove that host= part
   s///
   :1
   /\\$/{
     # if the line ends in \, append the next line and loop 
     N;b1
   }'

Answer 2

Give this a shot awk '{gsub("host","");gsub("=","");print;}' filename

awk remove the host and = and then just print each line.