Shantanu's Blog

Database Consultant

September 28, 2024

Firefox and Libreoffice in your browser

Kasm VNC is a modern open source VNC server.

Quickly connect to your Linux server's desktop from any web browser.
No client software install required.

1) Firefox using VNC

docker run -d \
--name=firefox \
-e PUID=1000 \
-e PGID=1000 \
-e TZ=Etc/UTC \
-p 3000:3000 \
-p 3001:3001 \
-v /path/to/config2:/config \
--shm-size="1gb" \
--restart unless-stopped \
lscr.io/linuxserver/firefox:latest

2) Libreoffice using VNC

docker run -d \
--name=libreoffice \
--security-opt seccomp=unconfined `#optional` \
-e PUID=1000 \
-e PGID=1000 \
-e TZ=Etc/UTC \
-p 3000:3000 \
-p 3001:3001 \
-v /path/to/config:/config \
--restart unless-stopped \
lscr.io/linuxserver/libreoffice:latest

Labels: aws, docker, firefox, libreoffice, linux tips, usability

posted by shantanu # Saturday, September 28, 2024 0 comments

September 24, 2024

export to pdf using linux command

You can generate a "pdf" file from Libreoffice writer "odt" file.

File - Export as PDF option is available only if you are using GUI
Here is how to convert to pdf using command line.

# vi Dockerfile
FROM ubuntu:latest

RUN apt-get update && \
apt-get install -y libreoffice

WORKDIR /workspace

ENTRYPOINT ["libreoffice", "--headless", "--convert-to", "pdf"]

# docker build -t shantanuo/libreoffice-converter .

run the docker command to convert a file to pdf
# docker run --rm -v .:/workspace shantanuo/libreoffice-converter /workspace/pm_in_paris.odt --outdir /workspace

_____

Use this dockerfile if you need to apply a template before creating a PDF file.

FROM ubuntu:latest

RUN apt-get update && apt-get install -y libreoffice python3 python3-venv

RUN python3 -m venv /workspace/venv

RUN /workspace/venv/bin/pip install --upgrade pip

RUN /workspace/venv/bin/pip install unotools

COPY * /workspace/

WORKDIR /workspace

# Start LibreOffice in headless mode in the background and run the Python script after it is started

ENTRYPOINT soffice --headless --accept="pipe,name=libreoffice;urp;StarOffice.ComponentContext" & \

sleep 5 && \

python3 /workspace/updated3.py /workspace/ra.txt /workspace/prajakta.ott

I can create an image and it converts the text file to PDF correctly.

docker build -t shantanuo/libreoffice-converter .

The raw text file and template is available in current directory. The generated PDF is also available in the same place after running this command:

docker run -v .:/workspace/ --rm shantanuo/libreoffice-converter

The python code to apply the template and create pdf is available here...

https://gist.github.com/shantanuo/f635bbdb764d1fafa8587203d7f8823a

Labels: docker, libreoffice

posted by shantanu # Tuesday, September 24, 2024 0 comments

September 08, 2024

awk Case Study - 12

Select the first column from the csv file and remove "www". In sql the command ill look something like this...

select replace(column1, 'www', '') from tbl

# cat logs.csv
Origin,Status,Title,ContentType,IP,Country,City,PhoneCode
https://gnu.org,OK,The GNU Operating System and the Free Software Movement,text/html,209.51.188.116,United States,Boston,+1
https://0t1.me,OK,ZeroToOne - Home,text/html,104.21.84.218,Canada,Toronto,+1

# cat myak.txt
#!/usr/bin/awk -f
BEGIN {
FS = ","
OFS = ""
}

function normalize_origin(origin) {
sub(/www./, "", origin) # remove www from the origin.
return origin
}

{
# Ignore the header line.
if(NR == 1) {
next
}

origin = normalize_origin($1)
print origin
}

# awk -f myak.txt < logs.csv
https://gnu.org
https://0t1.me

https://0t1.me/blog/2024/09/01/practical-awk/

Labels: awk

posted by shantanu # Sunday, September 08, 2024 0 comments

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