The command is ``date``

To customise the output there are a myriad of options available, see ``date --help`` for a list.

For example, ``date &#39;+%A %W %Y %X&#39;`` gives ``Tuesday 34 2013 08:04:22`` which is the name of the day of the week, the week number, the year and the time.

You can use `date` to get time and date of a day: 

    [pengyu@GLaDOS ~]$date
    Tue Aug 27 15:01:27 CST 2013

Also `hwclock` would do:

    [pengyu@GLaDOS ~]$hwclock
    Tue 27 Aug 2013 03:01:29 PM CST  -0.516080 seconds

For customized output, you can either redirect the output of `date` to something like `awk`, or write your own program to do that. 

Remember to put your own executable scripts/binary into your `PATH` (e.g. /usr/bin) to make it invokable anywhere.

Could someone explain? I understand the basic concepts behind them but I often see them used interchangeably and I get confused. 

And now that we&#39;re here, how do they differ from a regular function?

What is the difference between a &#39;closure&#39; and a &#39;lambda&#39;?

I&#39;m using Twitter Bootstrap modal window functionality. When someone clicks submit on my form, I want to show the modal window upon clicking the &quot;submit button&quot; in the form.

    &lt;form id=&quot;myform&quot; class=&quot;form-wizard&quot;&gt;
        &lt;h2 class=&quot;form-wizard-heading&quot;&gt;BootStap Wizard Form&lt;/h2&gt;
        &lt;input type=&quot;text&quot; value=&quot;&quot;/&gt;
        &lt;input type=&quot;submit&quot;/&gt;
    &lt;/form&gt;
    
    &lt;!-- Modal --&gt;
    &lt;div id=&quot;myModal&quot; class=&quot;modal hide fade&quot; tabindex=&quot;-1&quot; role=&quot;dialog&quot; aria-labelledby=&quot;myModalLabel&quot; aria-hidden=&quot;true&quot;&gt;
        &lt;div class=&quot;modal-header&quot;&gt;
            &lt;button type=&quot;button&quot; class=&quot;close&quot; data-dismiss=&quot;modal&quot; aria-hidden=&quot;true&quot;&gt;&#215;&lt;/button&gt;
            &lt;h3 id=&quot;myModalLabel&quot;&gt;Modal header&lt;/h3&gt;
        &lt;/div&gt;
        &lt;div class=&quot;modal-body&quot;&gt;
            &lt;p&gt;One fine body…&lt;/p&gt;
        &lt;/div&gt;
        &lt;div class=&quot;modal-footer&quot;&gt;
            &lt;button class=&quot;btn&quot; data-dismiss=&quot;modal&quot; aria-hidden=&quot;true&quot;&gt;Close&lt;/button&gt;
            &lt;button class=&quot;btn btn-primary&quot;&gt;Save changes&lt;/button&gt;
        &lt;/div&gt;
    &lt;/div&gt;
    
jQuery:
    
    $(&#39;#myform&#39;).on(&#39;submit&#39;, function(ev) {
        $(&#39;#my-modal&#39;).modal({
            show: &#39;false&#39;
        });	
    	
    		
    	var	data = $(this).serializeObject();
        json_data = JSON.stringify(data);
        $(&quot;#results&quot;).text(json_data); 
    	$(&quot;.modal-body&quot;).text(json_data); 
    	 
        // $(&quot;#results&quot;).text(data);
     
    	ev.preventDefault();
    });

How to open a Bootstrap modal window using jQuery?

I have to check the time in a Linux terminal.

What is the command for getting date and time in a Linux terminal?

Is there a way in which we can set a custom function?



How can I get the current date and time in the terminal and set a custom command in the terminal for it?

I have to check the time in a Linux terminal.
What is the command for getting date and time in a Linux terminal?
Is there a way in which we can set a custom function?

I just installed `screen` and like the idea to divide linux terminal into multiple pieces. But I can&#39;t figure out one thing: How to scroll up and down, when I&#39;m in `screen`. When I&#39;m using regular linux terminal I can achieve this with &lt;kbd&gt;Shift&lt;/kbd&gt; + &lt;kbd&gt;Pg Up&lt;/kbd&gt; or &lt;kbd&gt;Shift&lt;/kbd&gt; + &lt;kbd&gt;Pg Dn&lt;/kbd&gt;`. but unfortunatelly it doesn&#39;t work in divided terminal.

That&#39;s what I mean when saying `screen` and divided terminal:
![enter image description here][1]


And that&#39;s a regular termina (just in case):
![enter image description here][2]


  [1]: http://i.stack.imgur.com/0N9vH.png
  [2]: http://i.stack.imgur.com/586le.png

How to scroll up and down in sliced &quot;screen&quot; terminal

In my `.bashrc` I define a function which I can use on the command line later:

    function mycommand() {
        ssh user@123.456.789.0 cd testdir;./test.sh &quot;$1&quot;
    }


When using this command, just the `cd` command is executed on the remote host; the `test.sh` command is executed on the local host. This is because the semicolon separates two different commands: the `ssh` command and the `test.sh` command. 

I tried defining the function as follows (note the single quotes):

    function mycommand() {
        ssh user@123.456.789.0 &#39;cd testdir;./test.sh &quot;$1&quot;&#39;
    }

I tried to keep the `cd` command and the `test.sh` command together, but the argument `$1` is not resolved, independent of what I give to the function. It is always tried to execute a command

    ./test.sh $1

on the remote host. 

How do I properly define `mycommand`, so the script `test.sh` is executed on the remote host after changing into the directory `testdir`, with the ability to pass on the argument given to `mycommand` to `test.sh`?

How to execute a remote command over ssh with arguments?

This may sound silly, but I have a file/ script that need to run and in order to do it I must change it to become executable. I would want to use either `chmod a+x` or `chmod 755`. But is there a difference between using `chmod a+x` and `chmod 755`?


Difference between using &quot;chmod a+x&quot; and &quot;chmod 755&quot;

I&#39;m currently using tmux with xterm-256color $TERM variable. When in bash under tmux, pressing home/end would insert tilde characters (~). Outside of tmux the home/end keys work fine. 

Using cat and tput, I could see that there was a mismatch between the generated and expected sequences:

    $ cat -v # pressing home, then end
    ^[[1~^[[4~
    $ tput khome | cat -v; echo
    ^[OH
    $ tput kend | cat -v; echo
    ^[OF

To fix this, I decided to add the following to my .bashrc:

    if [[ -n &quot;$TMUX&quot; ]]; then
        bind &#39;&quot;\e[1~&quot;:&quot;\eOH&quot;&#39;
        bind &#39;&quot;\e[4~&quot;:&quot;\eOF&quot;&#39;
    fi

That fixed the problem for bash, however in other readline programs, such as within a REPL such as ipython, it still inserts a tilde for home/end. 

Why exactly is this a problem in the first place? Why is the generated sequence different when I&#39;m inside tmux vs outside it? How can fix this so that it&#39;s not an issue in any programs?

Home/End keys do not work in tmux

I have a simple BASH command that looks like

    for i in `seq 2`; do echo $i; done; &gt; out.dat

When this runs the output of `seq 2` is output to the terminal and nothing is output to the data file (out.dat)

I am expecting standard out to be redirected to out.dat like it does simply running the command `seq 2 &gt; out.dat`



Redirecting output of bash for loop

I&#39;m debugging a shell script and trying to find out the task performed by the following command:

    sed -i &#39;1,+999d&#39; /home/org_user/data.txt

I need to change this command as its failing with the following error:

    illegal option sed -i

But before changing, I need to understand the BAU functioning.

Appreciate any inputs in this regard.

What does sed -i option do?

When I restart the nginx service on a command line on an Ubuntu server, the service crashes when a nginx configuration file has errors. On a multi-site server this puts down all the sites, even the ones without configuration errors.

To prevent this, I run the nginx configuration test first:

    nginx -t

After the test ran successful, I could restart the service:

    /etc/init.d/nginx restart

**Or** only reload the nignx site configs without a restart:

    nginx -s reload

Is there a way to combine those two commands where the restart command is conditional to the configuration test&#39;s result?

I couldn&#39;t find this online and [the official documentation][1] on this is rather basic. I don&#39;t know my way around Linux that well, so I don&#39;t know if what I&#39;m looking for is right in front of me or not possible at all.

I&#39;m using nginx v1.1.19.

  [1]: http://wiki.nginx.org/CommandLine



How do I restart nginx only after the configuration test was successful on Ubuntu?

In an Ansible role I generate the user&#39;s SSH key. After that I want to print it to the screen and pause so the user can copy and paste it somewhere else. So far I have something like this:

    - name: Generate SSH keys for vagrant user
      user: name=vagrant generate_ssh_key=yes ssh_key_bits=2048
    - name: Show SSH public key
      command: /bin/cat $home_directory/.ssh/id_rsa.pub
    - name: Wait for user to copy SSH public key
      pause: prompt=&quot;Please add the SSH public key above to your GitHub account&quot;

The &#39;Show SSH public key&#39; task completes but doesn&#39;t show the output.

    TASK: [Show SSH public key] *************************************************** 
    changed: [default]


There may be a better way of going about this. I don&#39;t really like the fact that it will always show a &#39;changed&#39; status. I did find this pull request for ansible - https://github.com/ansible/ansible/pull/2673 - but not sure if I can use it without writing my own module.

Displaying output of a remote command with Ansible

I tried the following - 

I created a variable at the command prompt as follows - 

    mysql&gt; set @myId = 1;
    Query OK, 0 rows affected (0.00 sec)

Then, to display it, I tried the following without success - 

        mysql&gt; show myId;
        ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that 
    corresponds to your MySQL server version for the right syntax to use near &#39;myId&#39; at line 1
        mysql&gt; show @myId;
        ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that
    corresponds to your MySQL server version for the right syntax to use near &#39;@myId&#39; at line 1
        mysql&gt; PRINT @myId;
        ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that 
    corresponds to your MySQL server version for the right syntax to use near &#39;PRINT @myId&#39; at line 1
        mysql&gt; PRINT myId;
        ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that 
    corresponds to your MySQL server version for the right syntax to use near &#39;PRINT myId&#39; at line 1

So how can I display the value of `@myId`? 

How to display the value of a variable at the commandline in MySQL?

I am not able to clear the screen in the MySQL command line prompt. My screen is filled with tables, data and queries. How can I clear it up?





How can I clear the screen in the MySQL console?

As I write my bash scripts for my OS X that do general things, I am wondering where is a good place to keep them. Is there a directory I can put them all in where they will be picked up automatically?  Or should I create my own directory and then reference this directory from .profile or something?


Where do you keep your own scripts on OSX?

How would I change all files to 644 and all folders to 755 using `chmod` from the `linux` command prompt? (Terminal)



Change all files and folders permissions of a directory to 644/755

I have no real idea what I&#39;m doing here so please bear that in mind if you can help me!

I am trying to connect to my virtual server through a proxy but I can&#39;t connect, it just hangs. I&#39;m assuming this is because it&#39;s not getting through our proxy.

I have tried exactly the same thing at home and it works perfectly. I&#39;m on OSX using Terminal to connect.

Can anyone advise me how I can get through the proxy with SSH?

Connect with SSH through a proxy

I want to disable beep sound in terminal. Im not able to find an option to disable the beep sound in preferences. Could you please help me out?

-cherryhitech

Content Type	Original Author	Original Content on Stackoverflow
Question	harshal	View Question on Stackoverflow
Solution 1 - Linux	Vorsprung	View Answer on Stackoverflow
Solution 2 - Linux	starrify	View Answer on Stackoverflow

How can I get the current date and time in the terminal and set a custom command in the terminal for it?

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How to open a Bootstrap modal window using jQuery?

What is the difference between a 'closure' and a 'lambda'?

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