[CentOS] Define an alias with an embeded awk command error ?

Hi, guys:

   I'm trying to define an alias in .cshrc  with the embeded awk command,
like this :

alias checketh0  "ip add ls eth0 |awk '/inet/{print $2}' |sed -n '1p' "

Then i run "source ~/.cshrc" and run "checketh0" command in the terminal ,
but the result is the following :

   " inet 192.168.18.18/24 brd 192.168.18.255 scope global eth0"

but i want  this result :
192.168.18.18/24


How do I do it ? Any help will be highly appreciated.


Thanks for you help ~
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