MarianoM's questions

I do not know if it is possible to compare the contents of text files among other files in a second folder. I need the program to only search for matching strings and if it finds them, show both lines of the files with the matching string.

I have tried with diff but I do not get the result I expect.

An example of what I'm looking for is:

Assuming I have two folders and within each one are the text files I want to compare.

Folder1/test.txt:

example1 - A
exampleA - A
example2 - B
exampleB - C
example3 - C
exampleC - D

Folder2/test_different_name.txt:

exampleA - A
example3 - B
exampleB - C
exampleC - D
example1 - E

The result should be the matching strings of the compared files:

I added this bit as the formatting would not fit in a comment. If this is not the desired result, please delete it from the question! CharlesGreen

|==========================|
|String    |File 1 |File 2 |
|--------------------------|
|example1  |A      |E      |
|example3  |C      |B      |
|==========================|

Note that only the matching texts are printed and when the entire line does not match, the differences are printed on the screen.

I'm looking for a search engine for lists of text strings in files. I do not use the programs that only look for a line because I need to search several text strings and that the program performs the search in all files with the extension .txt.

The list of text strings to search, is only for the program to search one by one in each of the files. Once the search is complete, the program should show those files that match one or more of a text string specified in the list.

I am interested in installing Ubuntu as I have become familiar with it, and then in the future I would like to switch to Debian.

The issue is that I, personally, I like to configure the applications in a personalized way, adapt the desktop, toolbars and so on and not to lose time and make it practical to use.

I am not sure if in the /home all the configurations that the user makes on the system (including the packages installed) are saved and if it is compatible between the different Linux distributions, for example, Debian.

In addition to copying /home to migrate settings and personal documents, do you have to copy another file or folder so that is as similar as possible when you migrate to another distribution?

Is there a security risk when doing this?

I was observing the use of the sync command and I have read that this command makes sure that anything in memory is written to disk.

As I was thinking of installing Ubuntu on a removable disk (USB) I would like to know if it is necessary to execute this command.

It worries me that when turning off the computer, if data are still being written, they end up losing because of the system shutdown.

Is it necessary to run sync before shutting down or restart the system?

Does anyone explain more about this?

I'm thinking about creating a bash script where multiple options can be specified and at the end define the variables according to the chosen options or execute certain orders when receiving the different options. An example is worth more than a thousand words:

[X] Copy only (1) - Options typed by the user
[ ] Move only (2)
[X] Checksum  (3) - Options typed by the user
[ ] Reset permission (4)
[ ] Exit (5)

Select choice:

I have found some options but I do not know how to make them do a certain function because I do not understand how the code works.

Update:

Code functional:

#!/bin/bash

#Contributing code by Sergiy Kolodyazhnyy and adaptation for MarianoM.

resize -s 40 90 > /dev/null #Change window size.

option=$(dialog --clear --backtitle "Synchronization..." --title "Synchronize" \
    --checklist "Select the synchronization options:"  20 50 10 \
       checksum "Compare the content" off \
       detail "Show more information" off \
       directory "Synchronize folders" on \
       recursive "Include subfolders" off 2>&1 > /dev/tty)

for i in $option; do #Set parameter of the menu options.
       case $i in
         checksum) c="-c" ;;
         detail) v="-v" ;;
         directory) d="-d" ;;
         recursive) r="-r" ;;
       esac
     done

if [ -z $option ]; then #Check if the variable is empty. If it is empty, it means that the user has not chosen an option.
 clear 
 echo
 echo "Error: No option has been selected or dialog not installed. The program can not continue."
 echo  
   else
 clear
   source=$(dialog --clear --backtitle "Please select source..." --title "Source:" --fselect "" 20 50 2>&1 > /dev/tty)
     if [ -z $source ]; then
       clear
       echo
       echo "Error program. Source not selected, try again!"
       echo
       exit
     fi
 clear
 destination=$(dialog --clear --backtitle "Please select destination..." --title "Destination:" --fselect "" 20 50 2>&1 > /dev/tty)
     if [ -z $destination ]; then
       clear
       echo
       echo "Error program. Destination not selected, try again!"
       echo
       exit
     fi
 clear
 rsync  "$c" "$v" "$d" "$r" "$source" "$destination"
 echo
fi
exit

Is there a program to run in the terminal and tell it to just copy the sectors with information in use to an .img file and ignore the sectors NOT assigned? I need something like that so I can later mount it and not have to use temporary space to unzip the image.

Note: Clonezilla is not what I'm looking for because I need additional space to decompress the copy and mount it.

I have seen examples of using the dd and ddrescue command, and I see that instead of asking the user for the size of the block on their device, they recommend using bs=1M and I do not understand why.

What happens if the disk sector size is 512 bytes and 1MB is assigned to bs?

Can any value be used independently of the size of the disk sector?

In the case of discs of advanced format and with a capacity of 1TB, what do you recommend to use?

I am looking for a way to save a copy of the NTFS file system MFT to analyze the dates of last access to the files and also the complete list of files. I have thought about the use of DD to avoid having to mount the unit and not modify the date of the last access to the MFT (this I need to know when the disc was last used).

If possible I would also like to see the list of deleted files or be able to filter it by means of a command.

Is it possible to do this? Can this method be more practical to investigate the dates of last access or is it better for me to make a complete copy of the disk and analyze it with some software?

I am looking for some notetaking software that has a tree structure in the management of notes and folders. That is, I look for a software that can create multiple notes within a database file. Where possible, the use of the cloud is not required, but the notes can be synchronized, in case I need it in the future.

Also, if possible, recommend a notetaking app that can synchronize with Android offline or online.

Which notetaking software do you recommend?

I need to create a list of checksums of the files that are inside a directory, including any subdirectories.

The command that I try to execute is the following:

 sha256sum -b * 

Usage:

 -b = Read in Binary.

 * = Specifies that you must verify all file extensions.

With the command I get the following output:

sha256sum: test0: Is a directory e3d748fdf10adca15c96d77a38aa0447fa87af9c297cb0b75e314cc313367daf *test1.txt db0c7a354881fe2dd1b45642a68f6a971c7421e8fdffe56ffa7c740111e07274 *test2.txt

Instead of reporting that test0 is a directory, you should also generate the checksum of the content.

Do you recommend always using -b in any type of file? In what cases should -t be used?

Is it possible to filter the types of files I want to omit in the verification, without having to add all the files I want to admit? What command should I execute?

I looked for help but I do not find anything related.

I am here to ask you if it is possible for a ramdisk to get corrupted and if so, is it possible to verify the surface of it?

I would like to know if there is any command in Linux (Ubuntu, Linux Mint, etc) that is equivalent to the Windows full format option.