Error: /usr/bin/ld: cannot find -lfl

Error: /usr/bin/ld: cannot find -lfl
collect2: error: ld returned 1 exit status
Makefile:69: recipe for target 'unified' failed
make: *** [unified] Error 1

Solution: sudo apt-get install flex

How to install libsndfile and Armadillo library on ubuntu

Installation of libsndfile:

sudo apt-get install libsndfile-dev

Installation of Armadillo

1.  If not present already, install LAPACK, Boost and BLAS  with 

   sudo apt-get install liblapack-dev  sudo apt-get install libblas-dev  sudo apt-get install libboost-dev

2. Install Armadillo using 

   sudo apt-get install libarmadillo-dev

How to disable directory listings on apache running on Ubuntu

open /etc/apache2/apache2.conf

And the section of the settings that deals with listing directory in Apahce2 default root directory is this:

<Directory /var/www/>  Options Indexes FollowSymLinks  AllowOverride None  Require all granted  </Directory>  

To disable directory listing, edit the setting to be this:

<Directory /var/www/>  Options FollowSymLinks  AllowOverride None  Require all granted  </Directory>  

Save the file and restart Apache2 to load the new configuration settings.

How to disable Web server version disclosure

On Debian, Ubuntu or Linux Mint:

$ sudo vi /etc/apache2/apache2.conf

On CentOS, Fedora, RHEL or Arch Linux:

$ sudo vi /etc/httpd/conf/httpd.conf

Add the following two lines at the end of Apache config file.

1 2	ServerSignature Off ServerTokens Prod

Then restart web server to activate the change.

Ref: http://ask.xmodulo.com/turn-off-server-signature-apache-web-server.html

Protocol "'http" not supported or disabled in libcurl

Error: Protocol "'http" not supported or disabled in libcurl

Solution:

Ensure you are supplying curl with double quotes ("), not single quotes (')

how to enable curl in php at lunux (ubuntu) server

sudo apt-get install php7.3-curl

open /etc/php/7.3/apache2/php.ini

uncooment following line:

extension=curl

Restart apache:

sudo /etc/init.d/apache2 restart

put following line in your php file and execute in web browser

echo 'Curl: ', function_exists('curl_init') ? 'Enabled' : 'Disabled';

Some examples of perl call:

https://phpenthusiast.com/blog/five-php-curl-examples

Public Server Security

keep owner:-www-data, group:-www-data of ur main folder

https://www.digitalocean.com/community/questions/proper-permissions-for-web-server-s-directory

https://askubuntu.com/questions/58467/chmod-files-only-in-all-subdirectories

sudo find . -type d -exec chmod 755 -- {} +

sudo find . -type f -exec chmod 644 -- {} +

self signed certificate generation:

https://www.google.com/url?q=https://websiteforstudents.com/setup-apache2-http-with-self-signed-ssl-tls-certificates-on-ubuntu-16-04-lts-servers/&sa=D&source=hangouts&ust=1567070724777000&usg=AFQjCNHbl6huGH1GB5o_RvAy0_ZIMsKarw

Re: Regex expression to convert festival LTS to Leo LTS

\([a-z]* 1\)

\([a-z]* 0.\d+\)

On Tue, Jul 30, 2019 at 2:11 PM pranaw kumar <erpranaw@gmail.com> wrote:

Regex expression to convert festival LTS to Leo LTS

\([a-z] 1\)

\([a-z] 0.\d+\)

\(_epsilon_ 1\)

\(_epsilon_ 0.\d+\)

Regex expression to convert festival LTS to Leo LTS

Regex expression to convert festival LTS to Leo LTS

\([a-z] 1\)

\([a-z] 0.\d+\)

\(_epsilon_ 1\)

\(_epsilon_ 0.\d+\)

How to upgrade nodejs or npm

https://github.com/nodesource/distributions#debmanual

curl -sL https://deb.nodesource.com/setup_10.x | sudo -E bash -  sudo apt-get install -y nodejs

Error: *** Error in `appstreamcli': double free or corruption (fasttop): 
0x0000000000fe3990 ***

Solution:  sudo apt install --reinstall libappstream3

How to install JSON

JSON Installation:

download json-server-master package

apply command

 npm install json-server --save-dev

Got error: Linux 4.15.0-45-generic etc

Solution: upgrade to the latest version of npm using:
npm install -g npm@latest

How to Grant access based on IP address with PHP

https://daveismyname.blog/grant-access-based-on-ip-address-with-php

UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-6: ordinal not in range(128)

import sys  reload(sys)  sys.setdefaultencoding('utf8')

and then apply 
text1=text.decode('utf-8')

How to pass text string from php to python

$text="भारतीय भाषा टेक्स्ट टू स्पीच सिंथेसिस सिस्टम";

$p=shell_exec("python lang-detect.py "."\"$text\"");

Kind Regards  /सादर

Pranaw Kumar / प्रणव कुमार

Principal Technical Officer / प्रमुख तकनीकी अधिकारी
C-DAC MUMBAI / सी-डैक, मुंबई
Ph-(+91) (22) 26201604 Ext: 561

Mob: 7303226767

Unable to import package in python calling from php

https://blog.gisspan.com/2018/08/Python-package-management.html

Disable ENABLE_USER_SITE and then re-install the package, it would be installed in machine level directory, and then it would be accessible via php also (www-data user)





How to disable ENABLE_USER_SITE

open:

/usr/lib/python2.7/site.py

and change ENABLE_USER_SITE = None

to ENABLE_USER_SITE = False

This url is also having good info about package import:

https://github.com/gabrielfalcao/lettuce/issues/203

How To Create Sticky Element in HTML

https://www.w3schools.com/howto/howto_css_sticky_element.asp

https://www.w3schools.com/howto/howto_css_sticky_social_bar.asp

How to install Indian Language font in Ubuntu

Open Terminal and run below command:

sudo apt-get install fonts-indic

How to enable Telugu Font on Google Chrome

Go to below url and add Telugu font pack:

https://chrome.google.com/webstore/detail/telugu-font-pack/legmclcomflamejcfoplfdjfmippiibc

How to install JSON Server

JSON Installation:

download json-server-master package

Extract, open package.json file and edit the first line as follows:

 "name": "json-server" -->  "name": "json-server-test"

apply command

 npm install json-server --save-dev

Got error: Linux 4.15.0-45-generic etc

Solution: upgrade to the latest version of npm using:
npm install -g npm@latest