I want to convert a color pdf to black and white pdf in specific mode I want to convert all text in red or green in black (not in gray).

gs -o output.pdf \ -sDEVICE=pdfwrite \ -dBlackText=true \ -dBlackVector=true \ -sColorConversionStrategy=Gray \ -dProcessColorModel=/DeviceGray \ input.pdf

TOON (Token-Oriented Object Notation)

Token-Oriented Object Notation (TOON) is a compact data format designed to reduce token usage when passing structured information to Large Language Models (LLMs), achieving 30-60% fewer tokens compared to standard JSON.

It simplifies syntax by eliminating unnecessary punctuation and using a more readable structure, making it ideal for applications that frequently interact with LLMs

https://github.com/toon-format/toon

Example:

JSON: (41 Token)

{
  "users": [
    { "id": 1, "name": "Alice", "role": "admin" },
    { "id": 2, "name": "Bob", "role": "user" }
  ]
}

TOON: (21 token)

users[2]{id,name,role}:
  1,Alice,admin
  2,Bob,user

User the tool https://toonifyit.com/

F-Droid and Fossify

What is F-Droid? F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.

https://f-droid.org/

Here you can download many apps as:

Hot to change the mkv title

Use the following command:

>mkvpropedit old_title.mkv --edit info --set "title=new_title"

Anydesk - Error: Display_Server_Not_Supported

Solution:

sudo gedit /etc/gdm3/custom.conf

and hen the file is open then uncomment the following lines:

WaylandEnable=false
AutomaticLoginEnable=true
AutomaticLogin=<youruser>

in my case <youruser> is equal to max

Convert jpeg file to pdf

Step 1 - Installa the following package

    sudo apt install imagemagick

Step 2 - Use the following command:

    convert *.jpeg my_pdf.pdf 


The command above might yield an “operation not allowed” error. Fortunately, we
can easily fix it by executing:

sudo sed -i 's/^.*policy.*coder.*none.*PDF.\*//' /etc/ImageMagick-6/policy.xml

or better:

sudo gedit /etc/ImageMagick-6/policy.xml

add or change the row at end of the file (just before </policymap>) with the following:

<policy domain="coder" rights="read | write" pattern="PDF" />

PHP: How to extract emails from list file

 
$pattern = '/[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}/';
if ($file = fopen("a.vcf", "r")) {
    while(!feof($file)) {
        $line = fgets($file);
       if (preg_match($pattern, $line, $matches)) echo $matches[0]."\n";
    }
    fclose($file);
}

Nando Pappalardo: Sai qual é il limite più grande che abbiamo?

LocalSend - Share files to nearby devices. Free, open-source, cross-platform.

https://localsend.org/

Ho to remove metadata from a PDF

sudo apt install mat2


mat2 filename.pdf  # you will now end up with a file called filename.cleaned.pdf

mat2 --inplace filename.pdf  # this will overwrite original file with the new one, effectively removing the original file

mat2 --show filename.pdf  # this will show the metadata that will be removed, if any (similar to dry run)

Bash GUI for QPDF (using Python)

Step 1: Create a python program called mergePDF.py

import PySimpleGUIQt as sg
import sys
import os 

arg = sys.argv[1:] 

current_working_directory = os.getcwd() + "/undefined.pdf"
current_working_directory = "/home/max/Scrivania" + "/undefined.pdf"


class Listbox(sg.Listbox):

    def dragEnterEvent(self, e):
        e.accept()

    def dragMoveEvent(self, e):
        e.accept()

    def dropEvent(self, e):
        data = window['LISTBOX'].get_list_values()
        items = [str(v).replace("PySide2.QtCore.QUrl('file://", "").replace("')", "") for v in e.mimeData().urls()]
        for x in items:
          if (x[-4:].upper() != '.PDF'): items.remove(x)        
        data.extend(items)
        window['LISTBOX'].update(data)
        window.refresh()

    def enable_drop(self):
        self.Widget.setAcceptDrops(True)
        self.Widget.dragEnterEvent = self.dragEnterEvent
        self.Widget.dragMoveEvent = self.dragMoveEvent
        self.Widget.dropEvent = self.dropEvent
        
file_list_column = [
     [ 
        Listbox(arg, size=(50, 10), enable_events=True, key='LISTBOX', select_mode="single"), 
     ],
     [
        sg.Input(default_text=current_working_directory, key='FOLDER')
     ],       
]

image_button_move_column = [  
   [sg.Button("Up")],
   [sg.Button("Down")],
   [sg.Button("Delete")],  
]
       

image_button_action_column = [
   [
      sg.Button("Merge")
   ],
]

layout = [
   [
        sg.Column(file_list_column),
        sg.VSeperator(),
        sg.Column(image_button_move_column),
        sg.VSeperator(),
        sg.Column(image_button_action_column),
   ]
]   

window = sg.Window("pdfMerge V1.0", layout, finalize=True, resizable=False)
window['LISTBOX'].enable_drop()

def retreive_elem_selected(element):
    if element['LISTBOX']: 
       item = element['LISTBOX'][0]
    else: item = ""    
    return item      


def manage_up(item, mylist):
    if item:
       pos = mylist.index(item)
       newpos = pos-1
       if newpos>-1:
          mylist.insert(
             newpos,
             mylist.pop(pos)
            )  
    return mylist
       
def manage_down(item, mylist):
    if item:
       pos = mylist.index(item)
       newpos = pos+1
       mylist.insert(
             newpos,
             mylist.pop(pos)
            )  
    return mylist       
       

def manage_delete(item, mylist):
    if item:
       mylist.remove(item)
    return mylist 
    
def manage_merge(mylist,myfile):
    if myfile:
       str1 = " ".join(str("\""+x+"\"") for x in mylist) 
       os.system("qpdf --empty --pages "+ str1 + " -- " + myfile)  
    else: sg.popup('','The output field is empty') 
    
while True:

    event, values = window.read()
    
    item_selected = retreive_elem_selected(values)
    mylist = window['LISTBOX'].get_list_values()
    
    if event == sg.WINDOW_CLOSED:
       break
        
    if event == 'Merge':
       manage_merge(mylist,window['FOLDER'].get())    
       
    if event == 'Up':
       window['LISTBOX'].update(manage_up(item_selected,mylist))
       window['LISTBOX'].set_value(item_selected)
             
    if event == 'Down':
       window['LISTBOX'].update(manage_down(item_selected,mylist))
       window['LISTBOX'].set_value(item_selected)
       
    if event == 'Delete': 
       if item_selected:
          pos = mylist.index(item_selected)
          window['LISTBOX'].update(manage_delete(item_selected,mylist))
          mylist = window['LISTBOX'].get_list_values()
          if mylist:
             if pos < len(mylist): 
                window['LISTBOX'].set_value(mylist[pos])
             else: window['LISTBOX'].set_value(mylist[-1:])                    

   
    
window.close()

Step 2: create a bash file mergePDF.sh to run the mergePDF.py

#!/bin/bash
python3 /home/max/batfile/Py/mergePDF.py "$@"

where /home/max/batfile/Py/ is the path where your python file is stored

Step 3: create a link of mergePDF.sh file into scripts folder

    in my case into /home/max/.local/share/nautilus/scripts

How to run powershell from TaskActivity of Window

Use as Program or script: c:\windows\system32\WindowsPowerShell\v1.0\powershell.exe

and as arg use -executionpolicy bypass -file "C:\Temp\example.ps1"

where example.ps1 contain your script

The Real Home Automation: Home Assistant

https://www.home-assistant.io/

# Example script integration containing script syntax
script:
  example_script:
    sequence:
      # This is written using the Script Syntax
      - alias: "Turn on ceiling light"
        service: light.turn_on
        target:
          entity_id: light.ceiling
      - alias: "Notify that ceiling light is turned on"
        service: notify.notify
        data:
          message: "Turned on the ceiling light!"

How to extract mp3 from youtube

Install yt-dlp_linux

from https://github.com/yt-dlp/yt-dlp go su release and download linux yt-dlp_linux,
put all into a new folder ad assign the execution permission.

Download a specific video, i.e:

./yt-dlp_linux -x --audio-format mp3 https://www.youtube.com/watch?v=cen1SvpTsYk&ab_channel=BlackSabbath

The New European Law Anti Open Source.

Convert mp4 to mp3 under linux

 
#!/bin/bash
clear

# Example: ./mp4ToMp3.sh ~/Downloads

for entry in "$1"/*.mp4
do
  
  ext="${entry##*.}"
  filename="${entry:0:${#entry} - ${#ext}}"
  mp3file="${filename}mp3" 
  echo "$entry ===> $mp3file"
  ffmpeg -i "$entry" -vn -acodec libmp3lame -ac 2 -ab 160k -ar 48000 "$mp3file"
done

GUI for SECurity

Create a file called security.sh under ~/myscript directory

 
#!/bin/bash

unsecAction()
{
  retValue=$(zenity --password   --title="SECurity")
  
  case $? in
      0)
		 	password=$(echo $retValue | cut -d'|' -f1) 
		 	~/bin/security $fileSec $password
			;;
	  1)
            endmenu
            ;;
     -1)
		    endmenu
		   ;;
  esac  
	  
   
}

secAction()
{
  retValue=$(zenity --forms --title="SECurity" --text="Add a security password" --add-password="Password" --add-password="Re-password" )
  
  case $? in
      0)
		 	password1=$(echo $retValue | cut -d'|' -f1)
		 	password2=$(echo $retValue | cut -d'|' -f2) 
		 	
		 	if [ $password1 == $password2 ]
            then         
              ~/bin/security $fileSec $password1           
            else
              zenity --info --text="Different Passwords" 
              secAction       
            fi		 	
			;;
	  1)
            endmenu
            ;;
     -1)
		    endmenu
		   ;;
  esac  
	  
   
}

endmenu() {
  echo "Bye bye."
  exit 0;
}


mainmenu() 
{
 declare -i count
 count=0
 
 IFS=$(echo -en "\n\b")
 read -ra files <<< "$NAUTILUS_SCRIPT_SELECTED_FILE_PATHS" 
   
 for file in $NAUTILUS_SCRIPT_SELECTED_FILE_PATHS
 do
     let count++
 done
 
 
 
 if [ $count -gt 1 ]
 then
   zenity --info --text="Select only one file"
 else
 
   if [ -f $NAUTILUS_SCRIPT_SELECTED_FILE_PATHS ]
   then
       ext="${NAUTILUS_SCRIPT_SELECTED_FILE_PATHS##*.}"
       fileSec=$NAUTILUS_SCRIPT_SELECTED_FILE_PATHS
       
       if [ $ext == "sec" ]
       then         
         unsecAction           
       else
        secAction        
       fi
	      
   else
	   zenity --info --text="Select a file. It's a directory"   
   fi 
 fi
}

mainmenu

create a link of security.sh file called SECurity
and move it under ~/.local/share/nautilus/scripts

run the command

chmod +x ~/myscript/security.sh

chmod +x ~/.local/share/nautilus/scripts/SECurity

Now when you open the context menu you will see:

Now download this file (security) from here

and put under ~/bin directory

then run the command:

chmod +x ~/bin/security

Bash GUI for QPDF

 
#!/bin/bash

endmenu() {
  echo "Bye bye."
  exit 0;
}

getDestinationFile() 
{
   retValue=$(zenity --file-selection  --save --file-filter='PDF files (pdf) | *.pdf' --title="Select a PDF file (Destination)")
 
	case $? in
		0)
		    destinationPDFFile=$retValue
		    ;;
	esac
}

getOriginFiles() 
{
   retValue=$(zenity --file-selection  --multiple --file-filter='PDF files (pdf) | *.pdf' --title="Select a PDF files to merge")
 
	case $? in
		0)
		    originPDFFiles=$retValue
		    ;;
	esac
}

showOriginFiles()
{
   declare -i index
   index=1
   mylistFiles=()
   tmpmylistFiles=()
   IFS='|' 
   
   read -ra files <<< "$originPDFFiles"  
   for file in "${files[@]}";
   do
 	 tmpmylistFiles+=("$file" ) 
   done
   
   readarray -t tmpmylistFiles < <(printf '%s\n' "${tmpmylistFiles[@]}" | sort)
      
   for file in "${tmpmylistFiles[@]}";
   do
 	 mylistFiles+=("$index" "$file" )
	 let index++
   done    
   
   retValue=$(zenity --list  --hide-header --height=400 --width=700  --title='Files To Merge' --column=ID --column=Files  "${mylistFiles[@]}" ) 
   echo $retValue
 
}

mergeFiles()
{
   mylistFiles=()
   IFS='|'
   continua=1
   
   if [ -z "${destinationPDFFile}" ]; then   
     zenity --info --text="No destination file selected."
     continua=0
   fi
   
   if [ $continua == 1 ]; then 
	   if [ -z "${originPDFFiles}" ]; then   
		 zenity --info --text="No select files to merge."
		 continua=0
	   fi   
   fi
   
   if [ $continua == 1 ]; then
   
	   read -ra files <<< "$originPDFFiles"  
	   for file in "${files[@]}";
	   do
	   echo $file
		 mylistFiles+=("$file" ) 
		 let index++
	   done  
	   
	   readarray -t mylistFiles < <(printf '%s\n' "${mylistFiles[@]}" | sort)
	   
	   qpdf --empty --pages "${mylistFiles[@]}" -- "${destinationPDFFile}"
   fi   
}

mainmenu() 
{
	choice=$(zenity --height=250 --list  --hide-header --text "Select action" --ok-label="Select" --cancel-label="Exit" \
	                --title "Main Menu - Merge file" --radiolist  --column="ID" --column="Action" \
	                1 "File Destination" 2 "Add Files To Merge" 3 "View Files To Merge" 4 "Merge" )

	case $choice in
		     "File Destination")
								getDestinationFile
								mainmenu
		            			;;
		     "Add Files To Merge") 
								getOriginFiles
								mainmenu
		            			;;
		     "View Files To Merge")
							   showOriginFiles                   		     
							   mainmenu
		           			   ;; 
		     "Merge")
		                       mergeFiles
		                       mainmenu
		           	           ;;
	esac

}




mainmenu

Error 0x00000011b network printer (0x00000709)

To resolve in this way:

In the computer where the printer is connected

1) open regedit as administrator

2) create under

KEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Control \ Print \

the value

RpcAuthnLevelPrivacyEnabled ( as REG_DWORD (32) and set it to zero )

3) Re-start the computer.

For Error: 0x00000709

3. Change RPC Connection Settings

Once you've changed the printer name, you should ensure your printer is connected to the network. If it's connected, but you're still getting the error, modify the RPC connection settings in the group policy editor. This policy controls the protocol settings for outgoing RPC connections to a remote print spooler.

To enable and change the policy settings, follow these steps:

Type "Group Policy" in Windows Search. See how to find and use Windows Search if you need help with this.
Click on Edit group policy.
In the left-sidebar, select Administrative Templates > Printers.
Click Configure RPC connection settings twice.
To enable this policy, check the circle for Enabled.
Select RPC over named pipes from the dropdown menu for Protocol to use for outgoing RPC connections.
Hit OK after clicking Apply.
Restart your device.