Shell Script Question

fractal

This could equally go in Programming I suppose... Bah?!

Anyways Shell script problem..

Lets say I want to parse the output of a command and split it up according to newlines?

EG:
ip route show gives output:
default via 10.0.0.1
10.4.12.33 via 10.4.12.32
10.1.2.3 via 10.1.2.1

now lets say I wanted to insert "

---

" instead of each newline.. ? Output would be:
default via 10.0.0.1

---

10.4.12.33 via 10.4.12.32

---

10.1.2.3 via 10.1.2.1

I've tried stuff like:
ip route show | sed -e 's/\n/

---

/g'

but it doesnt seem to pick up on newlines.. If at all possible I'd like to use sed or some other utility you'll find on pretty much any machine..

pickarooney

Wild shot in the dark...

opstring=""
ip route show|while read nextline
do 
  opstring=opstring+"-----------"+$nextline
done  

fractal

Well fair f*&^s to you..

Cheers!

Few tweaks and it worked.

opstring=""
ip route show | while read nextline
do
opstring="$opstring

---

$nextline"
done

niallb

Nice one P,
I'll stick that construction in my toolbox for the future.

If you want to do it with sed, I think your problem is that
sed is treating the newline as a record seperator.
As such, it is not part of the record (opinions?)

If instead you substitute on the end of line as in

ip route show | sed -e 's/$/

---

/g' you'll get more mileage.

Oh, to stick them onto one line with a tool that exists on most systems?

ip route show | sed -e 's/$/

---

/g' | paste -s

I think the other way is cheaper in resources though.

NiallB