Question

With bash script/python/perl script, is it possible to show if the output of a command without a string, e.g.

curl -i http://www.google.com


HTTP/1.1 302 Found
Location: http://www.google.com.hk/
Cache-Control: private
Content-Type: text/html; charset=UTF-8

What I want to do is:

1. If the output contains 302, print nothing
2. Else, print 302 is missed

Answer 1

You can use the result of the curl|grep silented as test :

if ! `curl -i -s http://www.google.com|grep -q 302` ; then echo "302 is missed" ; fi