Linux notes

This post is a collection of useful notes for myself. I will update it with quick commands that I can't keep in memory but occasionally use.

Create ISO from CD or DVD on Linux

# dd if=/dev/{cdrom|sr0|whatever} of=file.iso

Set partition or drive label

View current label

# blkid -f

or

# blkid /dev/sda1

Change label

• ext4: e2label /dev/sda1 my_label
• fat: fatlabel /dev/sda1 my_label
• ntfs: ntfslabel /dev/sda1 my_label
• any fs: tune2fs -L "my_lable" /dev/sda1
• any fs with gparted (the partition must be unmounted)

Combine multiple images into one with ImageMagick

montage *.jpg -tile 5x3 -geometry +0+0 out.png

5 - columns

3 - rows

Change the terminal title from a bash script

Add this to the script: echo -ne "\033]2;Your title goes here\007"

For example:

#!/bin/bash
echo -ne "\033]2;Music\007"
mpg123 -qZ $HOME/Music/*

Convert SVG to PDF

Chrome browser method (supports embedded fonts)

#!/bin/bash
for i in {001..157}
do
google-chrome --headless --disable-gpu --print-to-pdf-no-header --no-pdf-header-footer --print-to-pdf="file${i}.pdf" "file${i}.svg"
done
pdfunite file*.pdf merged.pdf

Method 2 (doesn't support embedded fonts)

1. Install librsvg2-bin:sudo apt install librsvg2-bin
2. Multiple svg to a single pdf: rsvg-convert -f pdf -o out.pdf *.svg
3. A single file: rsvg-convert -f pdf -o out.pdf in.svg

Pad left the loop variable in bash

Just specify the desired width in the loop range:

#!/bin/bash

for i in {001..157}

Change the date of the file

• To change the file date to some specific value:
  touch -a -m -t 202301280130.09 filename
• To set the date of the file from another file but on 3 hours earlier:
  touch -d "$(date -R -r sourcefile) - 3 hours" destinationfile

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