Assuming you are using a unix OS, you would do the following.

edit the crontab file using the command

    crontab -e

add a line that resembles the one below

    */2 * * * * /Desktop/downloads/file_example.py

this can be used to run other scripts simply use the path to the script needed i.e.

    */2 * * * * /path/to/script/to/run.sh
    

An explanation of the timing is below (add a star and slash before number to run every n timesteps, in this case every 2 minutes)


    * * * * * command to be executed
    - - - - -
    | | | | |
    | | | | ----- Day of week (0 - 7) (Sunday=0 or 7)
    | | | ------- Month (1 - 12)
    | | --------- Day of month (1 - 31)
    | ----------- Hour (0 - 23)
    ------------- Minute (0 - 59)

You can use python-crontab module.

https://pypi.python.org/pypi/python-crontab

To create a new cron job is as simple as follows:

    from crontab import CronTab
    #init cron
    cron   = CronTab()
    
    #add new cron job
    job  = cron.new(command=&#39;/usr/bin/echo&#39;)
    
    #job settings
    job.hour.every(4)

I would like to sort and binary search a static array of strings via the String.CompareTo comparator.

The problem is that both sorting, and binary searching requires that a Comparator object be passed in -- So how do I pass in the built in string comparator?

Java get String CompareTo as a comparator object

I&#39;ve got error C2078 in VC2010 when compiling the code below.

    struct A
      {
      int foo;
      double bar;
      };
    
    std::array&lt;A, 2&gt; a1 = 
      // error C2078: too many initializers
      {
        {0, 0.1},
        {2, 3.4}
      };
    
    // OK
    std::array&lt;double, 2&gt; a2 = {0.1, 2.3};

I found out that the correct syntax for `a1` is

    std::array&lt;A, 2&gt; a1 = 
      {{
        {0, 0.1},
        {2, 3.4}
      }};


The question is: why extra braces are required for `a1` but not required for `a2`?

**Update**

The question seems to be not specific to std::array. Some examples:

    struct B
      {
      int foo[2];
      };
    
    // OK
    B meow1 = {1,2};
    B bark1 = {{1,2}};
    
    struct C
      {
      struct 
        { 
        int a, b; 
        } foo;
      };
    
    // OK
    C meow2 = {1,2};
    C bark2 = {{1,2}};
    
    struct D
      {
      struct 
        { 
        int a, b; 
        } foo[2];
      };
    
    D meow3 = {{1,2},{3,4}};  // error C2078: too many initializers
    D bark3 = {{{1,2},{3,4}}};

I still don&#39;t see why `struct D` gives the error but B and C don&#39;t.



When can outer braces be omitted in an initializer list?

Hi I have created a python file for example as `file_example.py`

The file will output the sensex value

Suppose the path of the file on linux system is `/Desktop/downloads/file_example.py`

and I normally will run the file like `python file_example.py`

But I want to set a cron job to run the python file every 2 min which is located at the above path

Can anyone please let me know how to do this 

**Edited Code**:

I had edited the code and created a bash script with the name test.sh as indicated below

    #!/bin/bash 
    cd /Desktop/downloads/file_example.py
    python file_example.py 2&gt;log.txt 

When I run the above file, the following error is displayed:

    sh-4.2$ python test.sh
      File &quot;test.sh&quot;, line 3
        python test.py 2&gt;log.txt 
                  ^
    SyntaxError: invalid syntax



How to run a python file using cron jobs

Hi I have created a python file for example as <code>file_example.py</code>
The file will output the sensex value
Suppose the path of the file on linux system is <code>/Desktop/downloads/file_example.py</code>
and I normally will run the file like <code>python file_example.py</code>
But I want to set a cron job to run the python file every 2 min which is located at the above path
Can anyone please let me know how to do this
Edited Code:
I had edited the code and created a bash script with the name test.sh as indicated below
<pre><code class="hljs language-bash">#!/bin/bash 
cd /Desktop/downloads/file_example.py
python file_example.py 2>log.txt 
</code></pre>
When I run the above file, the following error is displayed:
<pre><code class="hljs language-arduino">sh-4.2$ python test.sh
 File "test.sh", line 3
 python test.py 2>log.txt 
 ^
SyntaxError: invalid syntax
</code></pre>

This sort of question has been asked before in varying degrees, but I feel it has not been answered in a concise way and so I ask it again.

I want to run a script in Python. Let&#39;s say it&#39;s this:

    if __name__ == &#39;__main__&#39;:
        with open(sys.argv[1], &#39;r&#39;) as f:
            s = f.read()
        print s

Which gets a file location, reads it, then prints its contents. Not so complicated.

Okay, so how do I run this in C#?

This is what I have now:

        private void run_cmd(string cmd, string args)
        {
            ProcessStartInfo start = new ProcessStartInfo();
            start.FileName = cmd;
            start.Arguments = args;
            start.UseShellExecute = false;
            start.RedirectStandardOutput = true;
            using (Process process = Process.Start(start))
            {
                using (StreamReader reader = process.StandardOutput)
                {
                    string result = reader.ReadToEnd();
                    Console.Write(result);
                }
            }
        }

When I pass the `code.py` location as `cmd` and the `filename` location as `args` it doesn&#39;t work. I was told I should pass `python.exe` as the `cmd`, and then `code.py filename` as the `args`.

I have been looking for a while now and can only find people suggesting to use IronPython or such. But there must be a way to call a Python script from C#.

Some clarification:

I need to run it from C#, I need to capture the output, and I can&#39;t use IronPython or anything else. Whatever hack you have will be fine.

P.S.: The actual Python code I&#39;m running is much more complex than this, and it returns output which I need in C#, and the C# code will be constantly calling the Python code.

Pretend this is my code:

        private void get_vals()
        {
            for (int i = 0; i &lt; 100; i++)
            {
                run_cmd(&quot;code.py&quot;, i);
            }
        }


How do I run a Python script from C#?

I&#39;m building a website with flask where users have accounts and are able to login.
I&#39;m using flask-principal for the loging in part and the role management.
Is there a way of making the user&#39;s session expire after say 5 minutes or 10 minutes?
I was not able to find that in flask documentation or, flask-principal&#39;s documentation.

I thought of a way of doing it by hand, set a variable server-side with a time tag at the moment of login and at the next action the user takes, the server verifies the time-delta on that timestamp and deletes the session. 

Is there an easy way to make sessions timeout in flask?

I&#39;m working in Python and using Flask. When I run my main Python file on my computer, it works perfectly, but when I activate venv and run the Flask Python file in the terminal, it says that my main Python file has &quot;No Module Named bs4.&quot; Any comments or advice is greatly appreciated.

ImportError: No Module Named bs4 (BeautifulSoup)

I&#39;m using python to analyse some large files and I&#39;m running into memory issues, so I&#39;ve been using sys.getsizeof() to try and keep track of the usage, but it&#39;s behaviour with numpy arrays is bizarre. Here&#39;s an example involving a map of albedos that I&#39;m having to open:

    &gt;&gt;&gt; import numpy as np
    &gt;&gt;&gt; import struct
    &gt;&gt;&gt; from sys import getsizeof
    &gt;&gt;&gt; f = open(&#39;Albedo_map.assoc&#39;, &#39;rb&#39;)
    &gt;&gt;&gt; getsizeof(f)
    144
    &gt;&gt;&gt; albedo = struct.unpack(&#39;%df&#39; % (7200*3600), f.read(7200*3600*4))
    &gt;&gt;&gt; getsizeof(albedo)
    207360056
    &gt;&gt;&gt; albedo = np.array(albedo).reshape(3600,7200)
    &gt;&gt;&gt; getsizeof(albedo)
    80

Well the data&#39;s still there, but the size of the object, a 3600x7200 pixel map, has gone from ~200 Mb to 80 bytes. I&#39;d like to hope that my memory issues are over and just convert everything to numpy arrays, but I feel that this behaviour, if true, would in some way violate some law of information theory or thermodynamics, or something, so I&#39;m inclined to believe that getsizeof() doesn&#39;t work with numpy arrays. Any ideas?

Python memory usage of numpy arrays

In my program, user inputs number `n`, and then inputs `n` number of strings, which get stored in a list.

I need to code such that if a certain list index exists, then run a function.

This is made more complicated by the fact that I have nested if statements about `len(my_list)`.
    
Here&#39;s a simplified version of what I have now, which isn&#39;t working:

    n = input (&quot;Define number of actors: &quot;)

    count = 0

    nams = []

    while count &lt; n:
        count = count + 1
        print &quot;Define name for actor &quot;, count, &quot;:&quot;
        name = raw_input ()
        nams.append(name)
 
    if nams[2]: #I am trying to say &#39;if nams[2] exists, do something depending on len(nams)
        if len(nams) &gt; 3:
            do_something
        if len(nams) &gt; 4
            do_something_else

    if nams[3]: #etc.

If list index exists, do X

I need to run a shell script in Jenkins as root instead of the default user. What do I need to change?

My sudoers file is like this:

    # User privilege specification
    root    ALL=(ALL) ALL
    igx     ALL=(ALL) ALL
    %wheel  ALL=(ALL) ALL
    
    # Allow members of group sudo to execute any command
    # (Note that later entries override this, so you might need to move
    %sudo   ALL=(ALL) ALL
    #
    #includedir /etc/sudoers.d
    
    # Members of the admin group may gain root privileges
    %admin  ALL=(ALL) NOPASSWD:ALL
    root    ALL=(ALL) ALL
    jenkins ALL=NOPASSWD: /var/lib/jenkins/workspace/ing00112/trunk/source/
    jenkins ALL=(ALL) NOPASSWD:ALL
    #Defaults:jenkins !requiretty

How to run a script as root in Jenkins?

How can I pipe the stdout of multiple commands to a single command?  

Example 1: combine and sort the output of all three echo commands:

    echo zzz; echo aaa; echo kkk
desired output:

    aaa
    kkk
    zzz


Example 2: rewrite the following so that all the commands are in a single command-line using pipes, without redirects to a temp file:

    setopt &gt; /tmp/foo; unsetopt &gt;&gt; /tmp/foo; set &gt;&gt; /tmp/foo; sort /tmp/foo

Pipe multiple commands into a single command

I wanted to do grep for keywords with double quotes inside. To give a simple example:

    echo &quot;member&quot;:&quot;time&quot; | grep -e &quot;member\&quot;&quot;

That does not match. How can I fix it?


Escape double quote in grep

I saw this interesting question at a comment on [cyberciti.biz](http://www.cyberciti.biz/faq/how-to-redirect-output-and-errors-to-devnull/).

That I found I even can&#39;t find a flexible way to do this in one-line command with sh.

As far my thought for the solution is:

    tmp_file=`mktemp`
    (./script 2&gt;$tmp_file &gt;/dev/null; cat $tmp_file) | ./other-script
    rm tmp_file

But you see, this is not synchronous, and fatally, it&#39;s so ugly.


Welcome to share you mind about this. :)


Shell: redirect stdout to /dev/null and stderr to stdout

I need to run a java jar in server in order to communicate between two applications. I have written two shell scripts to run it, but once I start up that script I can&#39;t shut down / terminate the process. If I press &lt;kbd&gt;ctrl&lt;/kbd&gt;+&lt;kbd&gt;C&lt;/kbd&gt; or close the console, the server will shut down. Could anyone help me how to modify this script to run as a normal server?

     #!/bin/sh
    java -jar /web/server.jar
    echo $! 
    #&gt; startupApp.pid



Run java jar file on a server as background process

I added a new job in Jenkins, which I want to schedule periodically.

From *Configure job*, I am checking the &quot;Build Periodically&quot; checkbox and in the *Schedule* text field added the expression:

&gt; 15 13 * * *

But it does not run at the scheduled time.

Is it the correct procedure to schedule a job?

![Enter image description here][1]

The job should run at 4:20 AM, but it is not running.

  [1]: http://i.stack.imgur.com/ZBSZf.png


How do I schedule jobs in Jenkins?

My python script is not running under my crontab.

I have placed this in the python script at the top: &lt;br/&gt;

    #!/usr/bin/python

I have tried doing this:

    chmod a+x myscript.py

Added to my `crontab -e`:

    SHELL=/bin/bash
    PATH=/sbin:/bin:/usr/sbin:/usr/bin
    MAILTO=&quot;&quot;

    * * * * * /home/me/project/myscript.py

My /var/log/cron file says:

    Sep 21 11:53:02 163-dhcp /USR/SBIN/CROND[2489]: (me) CMD (/home/me/project/myscript.py)

But my script is not running because when I check my sql database, nothing has changed. If I run it directly in the terminal like so:

    python /home/me/project/myscript.py

I get the correct result.

This is the `myscript.py`:

    #!/usr/bin/python
    
    import sqlite3
    
    def main():
    	con = sqlite3.connect(&quot;test.db&quot;)
    
    	with con:
    
    		cur = con.cursor()
    
    		cur.execute(&quot;CREATE TABLE IF NOT EXISTS testtable(Id INTEGER PRIMARY KEY, Name TEXT)&quot;)
    
    		cur.execute(&quot;INSERT INTO testtable(Name) VALUES (&#39;BoB&#39;)&quot;)
    
    		cur.execute(&quot;SELECT * FROM testtable&quot;)
    
    		print cur.fetchall()    
    
    if __name__ == &quot;__main__&quot;:
    	main()


Per comments: Yes, `/usr/bin/python` exists. I can also run the python script directly using just `/home/me/project/myscript.py`. `/usr/bin/python /home/me/project/myscript.py` works. So I don&#39;t believe this is the cause?

Crontab not executing a Python script?

`*/20 * * * *`

Ensures it runs every 20 minutes, I&#39;d like to run a task every 20 minutes, starting at 5 past the hour, is this possible with Cron?  Would it be:

`5/20 * * * *`  ?


Run Cron job every N minutes plus offset

I am not sure how to run a cron job at 3 specific hours every day. I want to run it at 1pm, 2 pm and 3pm.

Is it possible, using a single expression?


Running a cron job 3 times (1 pm, 2 pm and 3 pm for example)?

i want to execute a script twice daily at 00:00 and 13:30 so i write :

    0,30 0,13 * * *

it seems wrong for me, because like this, the script will fire at 00:00 , 00:30 , 13:00 and 13:30. Any idea ?

Content Type	Original Author	Original Content on Stackoverflow
Question	Shiva Krishna Bavandla	View Question on Stackoverflow
Solution 1 - Python	olly_uk	View Answer on Stackoverflow
Solution 2 - Python	Guray Celik	View Answer on Stackoverflow

How to run a python file using cron jobs

Python Problem Overview

Python Solutions

Solution 1 - Python

Solution 2 - Python

When can outer braces be omitted in an initializer list?

Java get String CompareTo as a comparator object

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