Swap last two words in Bash
Answer:
Previous article we mentioned how to swap the last two characters in Bash, now we let you know how to Swap the last two words in Bash
Solution:
# foo bar
[Esc + t]That's simple, isn't?
Apr 222011
Linux Ask!
Apr 182011
Show HTTP response header using curl
Answer:
To show the response of HTTP request to a specific server, you can use the "curl -i" command.
Example:
# curl -i "http://www.example.com"
HTTP/1.0 302 Found
Location: http://www.iana.org/domains/example/
Server: BigIP
Connection: Keep-Alive
Content-Length: 0Update: Thanks Robin Clowers for the update.
Apr 162011
Remove the whole line when typing a command in Bash
Answer:
When you are typing a command in Bash shell, , to quickly remove the whole line, press "Ctrl + u" or "Ctrl + c"
This trick is very handy and should be known by all Bash users.
You might also want to read:
Apr 142011
Validate email address using PHP
Answer:
To validate an email address using PHP, you can use the code below. (It is from www.ilovejackdaniels.com/php/email-address-validation , it is not perfect, but better than most of the average solutions found in the Internet)
<?php
function check_email_address($email) {
// First, we check that there's one @ symbol,
// and that the lengths are right.
if (!ereg("^[^@]{1,64}@[^@]{1,255}$", $email)) {
// Email invalid because wrong number of characters
// in one section or wrong number of @ symbols.
return false;
}
// Split it into sections to make life easier
$email_array = explode("@", $email);
$local_array = explode(".", $email_array[0]);
for ($i = 0; $i < sizeof($local_array); $i++) {
if
(!ereg("^(([A-Za-z0-9!#$%&'*+/=?^_`{|}~-][A-Za-z0-9!#$%&
↪'*+/=?^_`{|}~\.-]{0,63})|(\"[^(\\|\")]{0,62}\"))$",
$local_array[$i])) {
return false;
}
}
// Check if domain is IP. If not,
// it should be valid domain name
if (!ereg("^\[?[0-9\.]+\]?$", $email_array[1])) {
$domain_array = explode(".", $email_array[1]);
if (sizeof($domain_array) < 2) {
return false; // Not enough parts to domain
}
for ($i = 0; $i < sizeof($domain_array); $i++) {
if
(!ereg("^(([A-Za-z0-9][A-Za-z0-9-]{0,61}[A-Za-z0-9])|
↪([A-Za-z0-9]+))$",
$domain_array[$i])) {
return false;
}
}
}
return true;
}
Apr 122011
How to query a domain name using a specific server
Answer:
To query a domain name using a specific server, you can use the following method:
# dig @8.8.8.8 google.com
In the above example, you are querying the domain google.com using the Google public DNS server. (8.8.8.8)
