Linux Notes Archives

How to Copy/Paste in Windows Subsystem for Linux (WSL)

Posted on October 29, 2020May 7, 2021 by Tony

If you’re working in terminal you’re used to using the copy / paste functions. Simple, but a necessity; when it’s missing you can get frustrated very fast.

I ran into this wall using the Windows Subsystem for Linux (WSL).

Turns out, it’s disabled by default.

Enable Copy / Paste

Enable it by opening the properties panel. You can access it by right-clicking the window pane header:

Then select the “Use Ctrl+Shift+C/V as Copy / Paste” option

That’s it. Now you can copy and paste, but if you’re coming from Mac, make note that you have to select the CTRL and SHIFT keys when making your Copy or Paste Selection.

Troubleshooting PHP-FPM Pool Setup: WordPress Requires FTP/SFTP User After Successful Configuration

Posted on August 14, 2020August 14, 2020 by Tony

This post assumes you have successfully installed PHP-FPM and have confirmed it is running on the server, and

# systemctl status php7.2-fpm.service
● php7.2-fpm.service - The PHP 7.2 FastCGI Process Manager
   Loaded: loaded (/lib/systemd/system/php7.2-fpm.service; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2020-08-13 03:40:43 UTC; 14min ago

Configured on the site:

But still getting this:

The good news is you are actually pretty close, and it’s actually something you missed in your site config file.

Go back and verify the port you’re listening on (e.g., vim /etc/php/7.2/fpm/pool.d/[pool name].conf). For instance, in my case it was:

listen = 127.0.0.1:9001

But my Apache config was looking for:

<FilesMatch "\.php$">
SetHandler "proxy:fcgi://127.0.0.1:9000/"
</FilesMatch>

A simple update to:

<FilesMatch "\.php$">
SetHandler "proxy:fcgi://127.0.0.1:9001/"
</FilesMatch>

And a restart of the web server:

systemctl restart apache2.service

Should do the trick, and get you situated again.

SSH Permission Denied on DD-WRT Router

Posted on August 4, 2020August 4, 2020 by Tony

DD-WRT is an OpenSource router firmware supported by most modern router systems. If you want to open the door to what you can do with your router, DD-WRT is the way to do it. It allows you to bypass the limitations your commercial router software introduces.

Ok, let’s cut to the chase..

Permission Denied Using SSH with DD-WRT

If you’re like me, you have probably hit a brick wall when trying to SSH into the router after it’s been imaged with DD-WRT.

Check All SSH Settings

There are two place you want to update SSHD settings. Navigate to the following location

Services > Services > Secure Shell

Here, you will enable the SSHD daemon.

Make note of the port you’re using, and select to use a password or key or both. This is pretty straight forward, in my scenario I selected to disable password login and use my public SSH key for security.

Snapshot of Secure Shell Panel on Services Page

Then, navigate here:

Administration > Management > Remote Access

Don’t ask me why, but here you will make sure that SSH Management is Enabled and that your port is set the same as the last page.

Snapshot of Remote Access Panel on Management Page

Now save, and reboot the machine to make sure the changes stick.

Verify Username is Correct

If you are still having an issue, and it looks something like this:

$ ssh admin@192.168.1.1

Release: 08/02/20

Board: Linksys WRT3200ACM

admin@192.168.1.1: Permission denied (publickey).

or, something like this:

$ ssh admin@192.168.1.1

ssh: connect to host 192.168.1.1 port 22: Network is unreachable

tony:public antonioperez$ ssh admin@192.168.1.1

Release: 08/02/20

Board: Linksys WRT3200ACM

admin@192.168.1.1’s password:

Permission denied, please try again.

admin@192.168.1.1’s password:

Permission denied, please try again.

admin@192.168.1.1’s password:

But you swear you are using the same username and password you log into the GUI with, then it might be something a little more frustrating.

The user.

Update the user to root instead of whatever user you were using. In my case, I was testing with admin.

After updating the username to ROOT:

$ ssh root@192.168.1.1

Release: 08/02/20

Board: Linksys WRT3200ACM

Enter passphrase for key ‘/Users/antonioperez/.ssh/id_rsa’:

Tada! Like magic, it started working. I have no idea why this is, but I have successfully used this on three DD-WRT installations and it works every time.

Cheers

How to remove .php / .html extension from URL slug

Posted on July 28, 2020July 28, 2020 by Tony

Was recently working on a project, not using a CMS like WordPress and Daniel was making fun of me for requiring “.php” in my URL.

Naturally, that could not go without a response.

Example of What I wanted to Do

Example of what I’m talking about:

https://defragged.org/somdirectory/somefile.php

I wanted to remove the “.php” extension from the URL, so that it reads:

https://defragged.org/somdirectory/somefile

If this is you, then here is the quick and dirty on how to get this done.

How To Remove .PHP / .HTML from URL Slug

I am working on Apache and the latest version of Ubuntu, but it should be the same for most of the latest versions.

Because this is a test server, I wanted to do a global deployment so that I don’t have to worry about it anymore. This saves me from having to remember to do this in each web directory via an .htaccess file.

Navigate to your apache config file, something like this:

# vim /etc/apache2/apache2.conf

Scroll to the bottom, and append this to your file:

<Directory /var/www/>
 <IfModule mod_rewrite.c>
  RewriteEngine On
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteRule ^(.*)/$ $1 [R,L]
  RewriteCond %{REQUEST_FILENAME}.php -f
  RewriteRule (.*) $1.php [L]
  RewriteCond %{REQUEST_FILENAME}.html -f
  RewriteRule (.*) $1.html [L]
 </IfModule>
</Directory>

Save the file, and restart the web server.

service apache2 restart

That should be it, clear your browser cache, and revisit the site. It should do the trick.

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Parse JSON Responses using Bash Scripts

Posted on July 16, 2020July 16, 2020 by Tony

I was working with the categorify.org site and I wanted to parse through the API’s response. The response was in JSON format.

There are a number of different ways you can do this, but if you want a quick, simple, way that uses existing tools you probably already have installed, this is for you.

To parse through the JSON response I used Python.

Here is an example of what I was doing:

curl -s https://categorify.org/api?website=pornhub.com

If you do this, the response is something like this:

$ curl -s https://categorify.org/api?website=pornhub.com

{“domain”:”pornhub.com”,”ip”:”31.192.120.36″,”country-code”:”NL”,”country”:”Netherlands”,”rating”:{“language”:true,”violence”:false,”nudity”:true,”adult”:true,”value”:”R & NSFW”,”description”:”Adult-only content and not safe for a work environment”},”category”:[“Adult\/Pornography”],”keyword_heatmap”:{“videos”:99,”free”:85,”pornhub”:61,”porn”:55,”models”:54,”premium”:45,”content”:45,”rated”:44,”photos”:44,”exclusive”:43,”party”:43,”gifs”:42,”sister”:39,”discover”:36,”online”:36,”video”:35,”albums”:34,”pornhubcom”:33,”cancel”:33,”subscribed”:30}}

What I specifically wanted was the category value: “category”:[“Adult\/Pornography”]

So I modified my command to pipe my output to python and ran the following:

$ curl -s https://categorify.org/api?website=pornhub.com | python -c ‘import json,sys;obj=json.load(sys.stdin);print obj[“category”]’

The section you’re most interested in is this: print obj[“category”]

You have to choose which object you want to print. In my case, I wanted the category object as it holds the value I am looking for.

You can use this to parse any JSON response, just update the print object with one that corresponds to your results. The beautiful part is that this should be available on most major OS platforms without additional installations.

Side note, here are two variations depending on which version of Python you have on your machine.

Python 3

python3 -c "import sys, json; print(json.load(sys.stdin)['category'])"

Python 2

python2 -c "import sys, json; print json.load(sys.stdin)['category']"

Use Bash Script to Monitor The Status of Service

Posted on June 9, 2020 by Tony

When you manage multiple servers it’s sometimes impossible to stay ahead of the various administrative tasks, which is why automation is so important.

If you’re working on a linux based server and want to monitor the status of a service, here is a quick an easy way to automate that process.

#!/bin/bash
# Script to find if a service is running

for i in ossec-monitord ossec-logcollector ossec-integratord;

do ps auwx | grep -v grep | grep $i >/dev/null 2>&1 ;

if [ $? = 0 ];

then

echo `date “+%Y-%m-%d %H:%M “`”$i Running…”;

else

echo `date “+%Y-%m-%d %H:%M “`”$i not running…”;

fi;

What we did above is create a simple loop looking for three distinct services:

ossec-monitord
ossec-logcollector
ossec-integratord

Those three services are assigned to the i variable, and that variable is then passed into the grep query here:

ps auwx | grep -v grep | grep $i >/dev/null 2>&1 ;

What we’re also doing above is cutting out any grep inquiries, because if you were to run a grep command it will show as a process as shown here in red:

root@server:~/scripts# ps auwx | grep ossec-logcollector

root 1260 0.0 0.0 4876 1784 ? S May19 0:03 /var/ossec/bin/ossec-logcollector

root 29353 0.0 0.0 14428 1116 pts/0 S+ 20:59 0:00 grep –color=auto ossec-logcollector

By cutting out the grep request you see this response:

root@server:~/scripts# ps auwx | grep -v grep | grep ossec-logcollector

root 1260 0.0 0.0 4876 1784 ? S May19 0:03 /var/ossec/bin/ossec-logcollector

This is important because this if [ $? = 0 ]; is looking for the grep exit value of 0, which states:

EXIT STATUS
The grep utility exits with one of the following values:

0 One or more lines were selected.
1 No lines were selected.
>1 An error occurred.

With this selection, if you run the grep and there are no service running it would still find the grep service itself. It’d give you a false positive response.

The echo command then prints the status of the service:

echo `date “+%Y-%m-%d %H:%M “`”$i Running…”;

It passes each argument through the loop. If the service is found to be running it prints:

2020-05-19 18:27 ossec-monitord Running…

2020-05-19 18:27 ossec-logcollector Running…

2020-05-19 18:27 ossec-integratord Running…

How To List UFW Rules When The Application is Inactive or Disabled

Posted on February 8, 2020May 20, 2020 by Tony

When working on your server you might need to disable the Uncomplicated Firewall (UFW). When doing so you’ll notice it doesn’t display your rules when the application is inactive.

How to Auto-Update CentOS 7 Packages with Yum-Cron

Posted on January 4, 2020April 10, 2020 by Tony

If you’re looking for a quick way to keep your CentOS machine patched at all times, become friends with yum-cron.

To install, in terminal, use:

#yum -y install yum-cron

The -y forces the install, answering any Yes / No “are you sure” questions.

Once installed, be sure to start the service using:

# systemctl start yum-cron.service

You can verify the status (make sure it’s running) using:

# systemctl status yum-cron.service

Output should look something like:

yum-cron.service – Run automatic yum updates as a cron job
Loaded: loaded (/usr/lib/systemd/system/yum-cron.service; enabled; vendor preset: disabled)
Active: active (exited) since Mon 2016-11-07 19:16:01 UTC; 2s ago
Process: 5385 ExecStart=/bin/touch /var/lock/subsys/yum-cron (code=exited, status=0/SUCCESS)
Main PID: 5385 (code=exited, status=0/SUCCESS)

Last step is to make sure it’s enabled, this will make sure it restarts in the event the machines reboots later.

# systemctl enable yum-cron.service

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How do you add color or bold the echo outputs in a shell script?

Posted on December 28, 2019April 10, 2020 by Tony

If you’re working in linux you will be introduced to writing shell scripts at some point. When you do, you’ll become very familiar with the echo.

If you open your terminal, and run an echo command it’ll literally echo whatever you put after the echo:

$ echo "Hello World" Hello World

Tar (Compress) a Directory without Images via Terminal

Posted on December 21, 2019April 10, 2020 by Tony

Sometimes you need to compress an entire directory, but sometimes you want to ignore specific file types.

Here is a basic command that you can use to remove specific file types before you compress it. In this example we use the find command to look for, and ignore, all image file types. That then gets piped into the tar command: