I need to retrieve the expiry date of an SSL cert. The curl application does provide this information:$ curl -v https://google.com/* Hostname was NOT found in DNS cache*   Trying 212.179.180.121...* Connected to google.com (212.179.180.121) port 443 (#0)* successfully set certificate verify locations:*   CAfile: none  CApath: /etc/ssl/certs* SSLv3, TLS handshake, Client hello (1):* SSLv3, TLS handshake, Server hello (2):* SSLv3, TLS handshake, CERT (11):* SSLv3, TLS handshake, Server key exchange (12):* SSLv3, TLS handshake, Server finished (14):* SSLv3, TLS handshake, Client key exchange (16):* SSLv3, TLS change cipher, Client hello (1):* SSLv3, TLS handshake, Finished (20):* SSLv3, TLS change cipher, Client hello (1):* SSLv3, TLS handshake, Finished (20):* SSL connection using ECDHE-ECDSA-AES128-GCM-SHA256* Server certificate:*        subject: C=US; ST=California; L=Mountain View; O=Google Inc; CN=*.google.com*        start date: 2014-10-22 13:04:07 GMT*        expire date: 2015-01-20 00:00:00 GMT*        subjectAltName: google.com matched*        issuer: C=US; O=Google Inc; CN=Google Internet Authority G2*        SSL certificate verify ok.> GET / HTTP/1.1> User-Agent: curl/7.35.0> Host: google.com> Accept: */*> < HTTP/1.1 302 Found< Cache-Control: private< Content-Type: text/html; charset=UTF-8< Location: https://www.google.co.il/?gfe_rd=cr&ei=HkxbVMzCM-WkiAbU6YCoCg< Content-Length: 262< Date: Thu, 06 Nov 2014 10:23:26 GMT* Server GFE/2.0 is not blacklisted< Server: GFE/2.0< <HTML><HEAD><meta http-equiv=content-type content=text/html;charset=utf-8><TITLE>302 Moved</TITLE></HEAD><BODY><H1>302 Moved</H1>The document has moved<A HREF=https://www.google.co.il/?gfe_rd=cr&amp;ei=HkxbVMzCM-WkiAbU6YCoCg>here</A>.</BODY></HTML>* Connection #0 to host google.com left intactHowever, when piping the output via grep the result is not less information on the screen, but rather much more:$ curl -v https://google.com/ | grep expire* Hostname was NOT found in DNS cache  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current                                 Dload  Upload   Total   Spent    Left  Speed  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0*   Trying 212.179.180.84...* Connected to google.com (212.179.180.84) port 443 (#0)* successfully set certificate verify locations:*   CAfile: none  CApath: /etc/ssl/certs* SSLv3, TLS handshake, Client hello (1):} [data not shown]* SSLv3, TLS handshake, Server hello (2):{ [data not shown]  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0* SSLv3, TLS handshake, CERT (11):{ [data not shown]* SSLv3, TLS handshake, Server key exchange (12):{ [data not shown]* SSLv3, TLS handshake, Server finished (14):{ [data not shown]* SSLv3, TLS handshake, Client key exchange (16):} [data not shown]* SSLv3, TLS change cipher, Client hello (1):} [data not shown]* SSLv3, TLS handshake, Finished (20):} [data not shown]* SSLv3, TLS change cipher, Client hello (1):{ [data not shown]* SSLv3, TLS handshake, Finished (20):{ [data not shown]* SSL connection using ECDHE-ECDSA-AES128-GCM-SHA256* Server certificate:*        subject: C=US; ST=California; L=Mountain View; O=Google Inc; CN=*.google.com*        start date: 2014-10-22 13:04:07 GMT*        expire date: 2015-01-20 00:00:00 GMT*        subjectAltName: google.com matched*        issuer: C=US; O=Google Inc; CN=Google Internet Authority G2*        SSL certificate verify ok.> GET / HTTP/1.1> User-Agent: curl/7.35.0> Host: google.com> Accept: */*> < HTTP/1.1 302 Found< Cache-Control: private< Content-Type: text/html; charset=UTF-8< Location: https://www.google.co.il/?gfe_rd=cr&ei=IkxbVMy4K4OBbKuDgKgF< Content-Length: 260< Date: Thu, 06 Nov 2014 10:23:30 GMT* Server GFE/2.0 is not blacklisted< Server: GFE/2.0< { [data not shown]100   260  100   260    0     0    714      0 --:--:-- --:--:-- --:--:--   714* Connection #0 to host google.com left intactI suspect that curl detects that it is not printing to a terminal and is thus gives different output, not all of which is recognized by grep as being stdout and is thus passed through to the terminal. However, the closest thing to this that I could find in man curl (don't ever google for that!) is this:PROGRESS METER   curl  normally  displays  a  progress meter during operations, indicating the amount of transferred data, transfer speeds and estimated time   left, etc.   curl displays this data to the terminal by default, so if you invoke curl to do an operation and it is about to write data to the  terminal,   it disables the progress meter as otherwise it would mess up the output mixing progress meter and response data.   If you want a progress meter for HTTP POST or PUT requests, you need to redirect the response output to a file, using shell redirect (>), -o   [file] or similar.   It is not the same case for FTP upload as that operation does not spit out any response data to the terminal.   If you prefer a progress bar instead of the regular meter, -# is your friend.How can I get just the expiry line out of the curl output? Furthermore, what should I be reading to understand the situation better?
How to grep the output of cURL?
bash;command line;curl
curl writes the output to stderr, so redirect that and also suppress the progress:curl -v --silent https://google.com/ 2>&1 | grep expireThe reason why curl writes the information to stderr is so you can do:curl <url> | someprgram without that information clobbering the input of someprogram