Playing with bash in the Mac OS X Terminal

playing_with_bash.txt

This is not a script
Simply type the stuff next to the ~ > into your Terminal like I did
Basically, we're playing around with doing a thing, and then with doing a thing several times
Play around with this for a few minutes, have fun with it, see if you can come up with your own variations

Homework, things to think about:
What does echo do?
What does for do?
What is {1..5}?
What does for i in {1..5} ; do SOMETHING ; done do?
What does curl do?
What does curl do without the curl -LI options?
What is a man page?
What does man curl do? Hint: Press q to exit a man page

References:
http://www.cyberciti.biz/faq/bash-for-loop/
http://tldp.org/LDP/abs/html/loops1.html


~ > echo "Hello World"
Hello World


~ > for i in {1..5} ; do echo "Hello World $i" ; done
Hello World 1
Hello World 2
Hello World 3
Hello World 4
Hello World 5


~ > for item in {1..5} ; do echo "Hello World $item" ; done
Hello World 1
Hello World 2
Hello World 3
Hello World 4
Hello World 5


~ > for value in {1..5} ; do echo "Hello World $value" ; done
Hello World 1
Hello World 2
Hello World 3
Hello World 4
Hello World 5


~ > for smurf in {1..5} ; do echo "Hello World $smurf" ; done
Hello World 1
Hello World 2
Hello World 3
Hello World 4
Hello World 5


~ > curl -LI http://www.google.com
HTTP/1.1 200 OK
Date: Sat, 15 Mar 2014 21:05:33 GMT
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
Set-Cookie: PREF=ID=dd8f904dc708639a:FF=0:TM=1394917533:LM=1394917533:S=B1e5wWIJD312CMKR; expires=Mon, 14-Mar-2016 21:05:33 GMT; path=/; domain=.google.com
Set-Cookie: NID=67=PJuSakUclgw5hjDaGWpKiffQpmEM9gg0_faRzMy7eY6n9T6M3T-WXRcxX8y7VLtChqaaSHDIKydciVKQkaqK9lP8LJYaVIwaXABg-Lzexd7Dj8FsgEQS9LhdZxtsJIoG; expires=Sun, 14-Sep-2014 21:05:33 GMT; path=/; domain=.google.com; HttpOnly
P3P: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info."
Server: gws
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
Alternate-Protocol: 80:quic
Transfer-Encoding: chunked


~ > for i in {1..5} ; do curl -LI http://www.google.com ; done
HTTP/1.1 200 OK
Date: Sat, 15 Mar 2014 21:05:42 GMT
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
Set-Cookie: PREF=ID=a99b646a8ffe818f:FF=0:TM=1394917542:LM=1394917542:S=VyIs9tlKL9ikL8PH; expires=Mon, 14-Mar-2016 21:05:42 GMT; path=/; domain=.google.com
Set-Cookie: NID=67=DlbbmD9Y2SVZldKhB1woZ2L6c4GqY7bNU3gqUlDzyslYBhg75qx-Md5XlGgnZYZrxKjbs5USiWIFlOcbPj3zOH8tnw71z2onXLhTMcuGxk4SGokHWtiNlHZqVrwhxHW8; expires=Sun, 14-Sep-2014 21:05:42 GMT; path=/; domain=.google.com; HttpOnly
P3P: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info."
Server: gws
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
Alternate-Protocol: 80:quic
Transfer-Encoding: chunked

HTTP/1.1 200 OK
Date: Sat, 15 Mar 2014 21:05:42 GMT
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
Set-Cookie: PREF=ID=f1d3efc4c48df754:FF=0:TM=1394917542:LM=1394917542:S=y9lauhD5mulZnWcY; expires=Mon, 14-Mar-2016 21:05:42 GMT; path=/; domain=.google.com
Set-Cookie: NID=67=BJYsi9FRF6648OUXhgXDNmBnhtET2HIOCBPcyBNOwfwr6Y9x-s-qHsuwGiRvDXogBsVBv70lWKAWccSKFRM4dHL7aaLmC0tzC4FO4HKuZ8xY5NXjt8raiBh47SmltYUO; expires=Sun, 14-Sep-2014 21:05:42 GMT; path=/; domain=.google.com; HttpOnly
P3P: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info."
Server: gws
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
Alternate-Protocol: 80:quic
Transfer-Encoding: chunked

HTTP/1.1 200 OK
Date: Sat, 15 Mar 2014 21:05:42 GMT
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
Set-Cookie: PREF=ID=4df46034722efedd:FF=0:TM=1394917542:LM=1394917542:S=Me15fQSLeec1V_L7; expires=Mon, 14-Mar-2016 21:05:42 GMT; path=/; domain=.google.com
Set-Cookie: NID=67=h4XXESsMhUbaegIdr_2wldNUCVodU1vsd64TGxtwSALsByjr6RODf8tzqZjocaHqYxnxSmrUFG_SV39FPJSDxz9HrcGpWUITvObNzNF3gGq7-z_y3vN6MxZ3R2YCx24F; expires=Sun, 14-Sep-2014 21:05:42 GMT; path=/; domain=.google.com; HttpOnly
P3P: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info."
Server: gws
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
Alternate-Protocol: 80:quic
Transfer-Encoding: chunked

HTTP/1.1 200 OK
Date: Sat, 15 Mar 2014 21:05:42 GMT
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
Set-Cookie: PREF=ID=66bdcaedf5077b27:FF=0:TM=1394917542:LM=1394917542:S=ERV089P-NDTDHfdl; expires=Mon, 14-Mar-2016 21:05:42 GMT; path=/; domain=.google.com
Set-Cookie: NID=67=HW1bMiu45GYZEL-4EANJ2zKy6V4zNyVPG3NUJ9lvYpixa2Zh6VF7bsBtWXIDVBTkA4wdisewj-gVSJipN2C7YU6BIpafAXPEn6zTxLfgVMnbzoBv7kHIQLdktZ0DixxI; expires=Sun, 14-Sep-2014 21:05:42 GMT; path=/; domain=.google.com; HttpOnly
P3P: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info."
Server: gws
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
Alternate-Protocol: 80:quic
Transfer-Encoding: chunked

HTTP/1.1 200 OK
Date: Sat, 15 Mar 2014 21:05:42 GMT
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
Set-Cookie: PREF=ID=93a2bf1e2f91f47f:FF=0:TM=1394917542:LM=1394917542:S=t1fz-gVL561Wgsqp; expires=Mon, 14-Mar-2016 21:05:42 GMT; path=/; domain=.google.com
Set-Cookie: NID=67=dDmW2R3BPWnUYFnZKDM5b7w0Y7fMbTaadeqSFszCAQ9sAJtz_avDTYambyX7oUWirAsEPAl-45L-ImzAMGrdnVv2oOWQWjJmSMIjtGZ5zAsLBjstE0goAP-geCGl-paG; expires=Sun, 14-Sep-2014 21:05:42 GMT; path=/; domain=.google.com; HttpOnly
P3P: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info."
Server: gws
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
Alternate-Protocol: 80:quic
Transfer-Encoding: chunked