Linux in daily use

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To update

sudo apt update

Remove unused packages:

sudo apt autoremove --purge

Clear old kernels (be careful with this):

sudo apt --purge autoremove

Clean up package cache:

sudo apt clean

Check your current swap size with RAM:

free -h

Question 1 : Can we marge multiple PDFs in ubuntu through terminal ?

The answer is Yes. there are multiple tools we can use. Here I will discuss about poppler tool. A PDF rendering library that includes a command-line tool called pdfunite. Install it using (Debian-based)

sudo apt install poppler-utils

or (RPM-based)

sudo dnf install poppler-utils

After installing we are prepared to marge files. Example command: pdfunite input1.pdf input2.pdf output.pdf

Question 2 : Can we connect or access internet in recovery mode on Ubuntu ?

Here is my answer Connecting to a Wi-Fi network in recovery mode on Ubuntu

Question 3 : How to trim pdf into specific pages on Ubuntu ?

So , We can do this by using different tools like pdftk,qpdf or pdfseparate.

• 1 Using pdftk (Personally I recommand this ) step 1 :

sudo apt install pdftk

step 2:

pdftk input_file_name.pdf cat 1-5 7 10-12 output output_file_name_you_want_to_create.pdf

Specifying Page Ranges Extract a Range of Pages To extract pages 1 through 5:

pdftk input.pdf cat 1-5 output output.pdf

Extract Specific Pages To extract only pages 2, 4, and 6:

pdftk input.pdf cat 2 4 6 output output.pdf

Combine Ranges and Individual Pages To extract pages 1 through 5, page 7, and pages 10 through 12:

pdftk input.pdf cat 1-5 7 10-12 output output.pdf

Reverse the Page Order: To reverse the order of pages 1 through 5:

pdftk input.pdf cat 5-1 output output.pdf

Extract All Pages : If you want to copy the entire file (e.g., to test extraction):

pdftk input.pdf cat 1-end output output.pdf

Examples Extract the first three pages:

pdftk document.pdf cat 1-3 output first_three_pages.pdf

Extract non-consecutive pages (e.g., 2, 5, and 8):

pdftk document.pdf cat 2 5 8 output selected_pages.pdf

Tips If the file name contains spaces, enclose it in quotes:

pdftk "my file.pdf" cat 1-3 output "trimmed file.pdf"

• 2 Using qpdf Install pdftk:

sudo apt install pdftk

Extract specific pages:

pdftk input.pdf cat 1-5 7 10-12 output output.pdf

Replace 1-5 7 10-12 with the range(s) or individual pages you need.

• 3 Using pdfseparate Install poppler-utils:

sudo apt install poppler-utils

Extract pages: To split the PDF into individual pages:

pdfseparate input.pdf page-%d.pdf

This creates page-1.pdf, page-2.pdf, etc. tips Combine the required pages (optional): Use pdfunite (also from poppler-utils) to merge the pages:

pdfunite page-1.pdf page-2.pdf output.pdf