Why don&#39;t you use `-q`?

From `man wget`:

    -q
    --quiet
       Turn off Wget&#39;s output.

### Test

    $ wget www.google.com
    --2015-05-08 14:07:42--  http://www.google.com/
    Resolving www.google.com (www.google.com)... 
      (...)
    HTTP request sent, awaiting response... 200 OK
    Length: unspecified [text/html]
    Saving to: ‘index.html’
    
        [ &lt;=&gt;                                                                                       ] 17,913      --.-K/s   in 0.01s   
    
    2015-05-08 14:07:42 (1.37 MB/s) - ‘index.html’ saved [17913]

And:

    $ wget -q www.google.com
    $



As an input to an API request I need to get yesterday&#39;s date as a string in the format `YYYY-MM-DD`. I have a working version which is:

    yesterday = datetime.date.fromordinal(datetime.date.today().toordinal()-1)
    report_date = str(yesterday.year) + \
       (&#39;-&#39; if len(str(yesterday.month)) == 2 else &#39;-0&#39;) + str(yesterday.month) + \
       (&#39;-&#39; if len(str(yesterday.day)) == 2 else &#39;-0&#39;) + str(yesterday.day)

There must be a more elegant way to do this, interested for educational purposes as much as anything else!

Python - Get Yesterday&#39;s date as a string in YYYY-MM-DD format

I have a data frame that looks like this:

    company  Amazon  Apple  Yahoo
    name
    A             0    130      0
    C           173      0      0
    Z             0      0    150

It was created using this code:

    import pandas as pd
    df = pd.DataFrame({&#39;name&#39; : [&#39;A&#39;, &#39;Z&#39;,&#39;C&#39;],
                       &#39;company&#39; : [&#39;Apple&#39;, &#39;Yahoo&#39;,&#39;Amazon&#39;],
                       &#39;height&#39; : [130, 150,173]})
    
    df = df.pivot(index=&quot;name&quot;, columns=&quot;company&quot;, values=&quot;height&quot;).fillna(0)

What I want to do is to sort the row (with index `name`) according to a predefined list: 

    [&quot;Z&quot;, &quot;C&quot;, &quot;A&quot;]`

Resulting in this :

    company  Amazon  Apple  Yahoo
    name
    Z             0      0    150
    C           173      0      0
    A             0    130      0

How can I achieve that?

How to reorder indexed rows based on a list in Pandas data frame

I don&#39;t want to see any message when I use `wget`. I want to suppress all the output it normally produces on the screen.

How can I do it?

How to hide wget output in Linux?

<p>I don't want to see any message when I use <code>wget</code>. I want to suppress all the output it normally produces on the screen.</p>
<p>How can I do it?</p>


I&#39;m new to Ubuntu and Linux in general. I want to code in Java on my computer, but I&#39;m having problems installing [IntelliJ IDEA][1] on Ubuntu. I have downloaded and extracted the file and for some reason renamed the folder to idea. I tried moving the folder to `/usr/share/applications` or something but I didn&#39;t have permission. I used `sudo -i` in terminal to gain permission but didn&#39;t manage to get out of root folder. Can anyone help me with a step by step way to move the folder, create a shortcut in the search bar or whatever it&#39;s called and install it properly?

  [1]: https://www.jetbrains.com/idea/download/#section=windows

How to install Intellij IDEA on Ubuntu?

I am on UBUNTU. JDK version currently installed is:

    java version &quot;1.7.0_51&quot;
    Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
    Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)

the configuration being installed is:

    sudo update-alternatives --config java
    There is only one alternative in link group java 
    (providing /usr/bin/java):     /usr/lib/jvm/java-7-oracle/jre/bin/java

I downloaded the latest tar.gz archive of JDK 1.8.

How can I easily install JDK 1.8 from tar.gz overriding/uninstalling the JDK 1.7 currently installed? Or even without explicitly use the tar.gz. 


Moving from JDK 1.7 to JDK 1.8 on Ubuntu

When I try to run Mongod in terminal I got this message : 

    2015-05-14T17:33:04.554+0700 I STORAGE  [initandlisten] exception in initAndListen: 29 Data directory /data/db not found., terminating
    2015-05-14T17:33:04.554+0700 I CONTROL  [initandlisten] dbexit:  rc: 100

and running mongo command  : 

    MongoDB shell version: 3.0.3
    connecting to: test
    2015-05-14T17:34:26.679+0700 W NETWORK  Failed to connect to 127.0.0.1:27017, reason: errno:111 Connection refused
    2015-05-14T17:34:26.681+0700 E QUERY    Error: couldn&#39;t connect to server 127.0.0.1:27017 (127.0.0.1), connection attempt failed
        at connect (src/mongo/shell/mongo.js:179:14)
        at (connect):1:6 at src/mongo/shell/mongo.js:179
    exception: connect failed

I Have tried to change permision in /var/lib/mongodb and /var/log/mongodb, but still doesnt work, and I tried to uninstall and install mongodb again, but still the same problem exist.
Anyone could help? Thanks

I&#39;m using Ubuntu 14.04 LTS 64 bit 


MongoDB Data directory /data/db not found

I know a little about Linux. Today I created a [VPN][1] server on my Ubuntu installation according to *[Set up a simple IPsec/L2TP VPN server for Ubuntu, Arch Linux and Debian][2]*.

But when I finish the installation, I use my iPhone to connect the [IPsec][3] VPN, bur it shows the VPN Server has no response.

The GitHub document shows

&gt; Ports 1701, 500 and 4500 must be opened for the VPN to work!

So I have tried to open these ports on my Ubuntu server.

I use the [iptables][4] command to open these ports, but it failed. Maybe I don&#39;t known how to use this command correctly. How can I open these ports on my Ubuntu server?

And if these ports have been opened successfully, can it be proved by the Windows [CMD][5] window through [telnet][6]&#39;ting the port?


  [1]: https://en.wikipedia.org/wiki/Virtual_private_network
  [2]: https://github.com/philplckthun/setup-simple-ipsec-l2tp-vpn
  [3]: https://en.wikipedia.org/wiki/IPsec
  [4]: https://en.wikipedia.org/wiki/Iptables
  [5]: https://en.wikipedia.org/wiki/Cmd.exe
  [6]: https://en.wikipedia.org/wiki/Telnet







How can I open some ports on Ubuntu?

I need to run a `CRON` job every 10 seconds from started time.

In Linux how to run a `CRON` job on every 10 seconds from the time its started? 

I am trying to solve that as following: **when I make a request (or start) at 04:28:34 it should start at 04:28:44 not at 4:28:40**

This is what I have done
```
# m h  dom mon dow   command
*/10 * * * * /usr/bin/wget http://api.us/application/
```
What did I do wrong? Why does this not trigger `wget` every 10 seconds?

How to setup CRON job to run every 10 seconds in Linux?

I have seen this command in a tutorial to create a new directory:

    mkdir my-new-project &amp;&amp; cd $_

I know `mkdir my-new-project` command is used to create a new directory, but what does `cd $_` do?

what does &#39;cd $_&#39; mean?

I am trying to edit an entry to PATH, as I did something wrong.

I am using [Mac&amp;nbsp;OS&amp;nbsp;X v10.10.3][1] (Yosemite)

I have tried:

    touch ~/.bash_profile; open ~/.bash_profile

But the file editor opens with nothing inside.

My problem:

I am trying to install ANDROID_HOME to my PATH

I misspelled it, but when I closed the terminal and went back it was gone, so I tried again:

&gt;     export ANDROID_HOME=/&lt;installation location&gt;/android-sdk-macosx
&gt;     export PATH=${PATH}:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools

This time, I typed the command correctly but, when I closed the terminal, my settings disappeared again.

How do I execute my desired settings?

If I was to edit bash.profile, how would I enter the above code?

  [1]: https://en.wikipedia.org/wiki/OS_X_Yosemite

 

How do I edit $PATH (.bash_profile) on OS X?

I&#39;d like to find out if a Docker image with a specific tag exists locally. I&#39;m fine by using a bash script if the Docker client cannot do this natively.

Just to provide some hints for a potential bash script the result of running the `docker images` command returns the following:

    REPOSITORY                               TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
    rabbitmq                                 latest              e8e654c05c91        5 weeks ago         143.5 MB
    busybox                                  latest              8c2e06607696        6 weeks ago         2.433 MB
    rabbitmq                                 3.4.4               a4fbaad9f996        11 weeks ago        131.5 MB

How to check if a Docker image with a specific tag exist locally?

I have a string `${testmystring}` in my **.sh** script and I want to check if this string does not contain another string.

		if [[ ${testmystring} doesNotContain *&quot;c0&quot;* ]];then
			# testmystring does not contain c0
		fi 

How can I do that, i.e. what is doesNotContain supposed to be?

Bash checking if string does not contain other string

A script takes a URL, parses it for the required fields, and redirects its output to be saved in a file, *file.txt*. The output is saved on a new line each time a field has been found. 

###    file.txt
    A Cat
    A Dog
    A Mouse 
    etc... 

I want to take `file.txt` and create an array from it in a new script, where every line gets to be its own string variable in the array. So far I have tried: 

    #!/bin/bash

    filename=file.txt
    declare -a myArray
    myArray=(`cat &quot;$filename&quot;`)

    for (( i = 0 ; i &lt; 9 ; i++))
    do
      echo &quot;Element [$i]: ${myArray[$i]}&quot;
    done

When I run this script, whitespace results in words getting split and instead of getting 

###    Desired output

    Element [0]: A Cat 
    Element [1]: A Dog 
    etc... 

I end up getting this:

###    Actual output
    Element [0]: A 
    Element [1]: Cat 
    Element [2]: A
    Element [3]: Dog 
    etc... 

How can I adjust the loop below such that the entire string on each line will correspond one-to-one with each variable in the array? 

Creating an array from a text file in Bash

I tried &#39;-N&#39; and &#39;--no-clobber&#39; but the only result that I get is to retrieve a new copy of the existing example.exe with number a number added using this synax &#39;example.exe.1&#39;. This is not what I&#39;d like to get. I just need to download and overwrite the file example.exe in the same folder where I already saved a copy of example.com without that wget verifies if the mine is older or newer respect the on example.exe file already present in my download folder. Do you think is i possible or I need to create a script that delete the example.exe file or maybe something that change his modification date etc?

How to force wget to overwrite an existing file ignoring timestamp?

I try to install wget in MAC OS 10.11.1 but when I run `./configure --with-ssl=openssl` I get this error:

    configure: error: --with-ssl=openssl was given, but SSL is not available.

How to resolve this problem in OSX 10.11.1?

How to install wget in macOS?

Let&#39;s say I have a text file of hundreds of URLs in one location, e.g.

    http://url/file_to_download1.gz
    http://url/file_to_download2.gz
    http://url/file_to_download3.gz
    http://url/file_to_download4.gz
    http://url/file_to_download5.gz
    ....

What is the correct way to download each of these files with `wget`? I suspect there&#39;s a command like `wget -flag -flag text_file.txt`

How to `wget` a list of URLs in a text file?

As a user in a class that runs Jupyter notebooks for assignments, I have access to the assignments via the web interface. I assume the assignments are stored somewhere in my personal space on the server, and so I should be able to download them. How can I download all files that are in my personal user space? (e.g., `wget`)

Here&#39;s the path structure:

`https://urltoserver/user/username`

There are several directories: assignments, data, etc.

`https://urltoserver/user/username/assignments`

`https://urltoserver/user/username/data`

`...`

I want to download all the folders (recursively). Just enough that I can launch whatever I see online locally. If there are some forbidden folders, then ok, skip those and download the rest.

Please specify the command exactly as I couldn&#39;t figure it out myself (I tried `wget`)

Content Type	Original Author	Original Content on Stackoverflow
Question	Ashot Khachatryan	View Question on Stackoverflow
Solution 1 - Linux	fedorqui	View Answer on Stackoverflow

How to hide wget output in Linux?

Linux Problem Overview

Linux Solutions

Solution 1 - Linux

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How to reorder indexed rows based on a list in Pandas data frame

Python - Get Yesterday's date as a string in YYYY-MM-DD format

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