Limit CPU and Memory usage in Linux Slack

The Linux Slack consumes a lot of CPU and memory in Linux environment. To limit its resource usages, you can apply a quote via the snap command:

sudo snap set-quota slacklimit --memory=2GB --cpu=20% slack

Sync multiple git repo at once

Use the following command in Linux will do the job:

 ls -d RepoNames* | xargs -I{} git -C {} pull

ffmpeg to convert MPEG4 to Animated GIF

In short, use the following command to do the conversion:

ffmpeg -i source_file.m4v -filter_complex "[0:v] split [a][b];[a] palettegen [p];[b][p] paletteuse" output_trimmed_enhanced.gif

Reference: https://www.bannerbear.com/blog/how-to-make-a-gif-from-a-video-using-ffmpeg/

Using Conda behind firewall

 To use conda behind firewall, in Windows:

1) Edit the .condarc

channels:

- defaults

proxy_servers:

  http: <proxy_host>:8080

  https: <proxy_host>:8080

ssl_verify: False

NOTE: Beware doing something like this:

http: http://proxyhost:8080

https: http://proxyhost:8080

Don't add "http://" above, it's wrong!

2) Using pip (need to trust the hosts)

pip install --trusted-host pypi.org --trusted-host pypi.python.org --trusted-host files.pythonhosted.org pandas

Some other better methods exist, the above is just one of the options that works.

Bind port 80 for normal user in Linux

To bind port 80 for normal user in Linux, use 'authbind'

Steps:

1. sudo apt get authbind

2. sudo touch /etc/authbind/byport/80

3. sudo chown user:user /etc/authbind/byport/80

4. chmod 500 /etc/authbind/byport/80

5. authbind --deep <command to run> (e.g. quasar dev)

Favourite LS_COLORS

Just wanna have my script files (Python script, Shell script) shows color in ls:

LS_COLORS=$LS_COLORS:'*.py=0;94:*.sh=0;94' ; export LS_COLORS 

Watch git log automatically

Linux one-liner to watch and refresh git log every 30 secs:

watch --color -n 30 "git fetch; git log origin/master -30 --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit --color=always"

scp windows recursive copy problem

 In you encounter scp problem when doing a recursive copy from Windows to Linux, try adding the -O parameter.

scp -r -O sample-files/ target-server:/target-path/

Run X11 application in docker

 To run X11 / X-Window application in docker, the following tutorial provides a simple approach to archive it:

https://blog.yadutaf.fr/2017/09/10/running-a-graphical-app-in-a-docker-container-on-a-remote-server/

Stop QGIS from generating the .aux.xml files when opening GeoTiff files

1. Start QGIS
2. Go to "Settings" > "Options"
3. In Options window, find "System", then "Environment"
4. Add environment variable "GDAL_PAM_ENABLED" with value equals "NO"
5. Restart QGIS

Reference: https://blog.csdn.net/u014311125/article/details/108625203