https://github.com/tpvasconcelos/howtos
Miscellaneous how-tos, and code snippets
https://github.com/tpvasconcelos/howtos
howto snippets
Last synced: about 1 year ago
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Miscellaneous how-tos, and code snippets
- Host: GitHub
- URL: https://github.com/tpvasconcelos/howtos
- Owner: tpvasconcelos
- Created: 2021-07-24T17:41:51.000Z (almost 5 years ago)
- Default Branch: master
- Last Pushed: 2024-09-19T16:53:22.000Z (over 1 year ago)
- Last Synced: 2025-02-15T12:18:15.821Z (over 1 year ago)
- Topics: howto, snippets
- Language: CSS
- Homepage:
- Size: 393 KB
- Stars: 1
- Watchers: 2
- Forks: 0
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- Code of conduct: CODE_OF_CONDUCT.md
Awesome Lists containing this project
README
# Miscellaneous how-tos, and code snippets
## Shell
### Ask for `sudo` password only once
Add this to the top of your shell script.
```shell script
################################################################################
# Ask for root password upfront and keep updating the existing `sudo`
# timestamp on a background process until the script finishes. Note that
# you'll still need to use `sudo` where needed throughout the scripts.
################################################################################
echo "Some of the commands in this script require root access. Enter your password to unable root access when necessary..."
sudo -v
while true; do
sudo -n true
sleep 30
kill -0 "$$" || exit
done 2>/dev/null &
```
### `ffmpeg` - Video from images
```shell script
ffmpeg -framerate 24.994862 -i img%06d.png -c:v libx264 -vf fps=24.994862 -pix_fmt yuv420p myMovie.mp4
```
### [FIXME] Remove local CloudDocs copies
```shell script
# $ source ~/.zshrc
function _safer_evict() {
input_path=$(realpath "$@")/
# shellcheck disable=SC2034
path_to_icloud=$(realpath ~/Library/Mobile\ Documents/com~apple~CloudDocs)/
if [[ "${input_path##path_to_icloud}" != "${input_path}" ]]; then
echo yes;
echo "$input_path";
fi
}
function _evictall() {
_SAFER_EVICT=$(functions _safer_evict)
#find "$1" -type f -not -name .DS_Store -a -not -name .\*.icloud -exec "$SHELL" -c '_safer_evict "$@"' -- {} \;
#find "$1" -type f -not -name .DS_Store -a -not -name .\*.icloud -exec zsh -c '_safer_evict "$@"' zsh {} \;
# find "$1" -type f -not -name .DS_Store -a -not -name .\*.icloud -print0 | xargs -0 ls
#find "$1" -type f -not -name .DS_Store -a -not -name .\*.icloud -print0 | xargs -0 bash -c '_safer_evict "$@"' _
#find "$1" -type f -not -name .DS_Store -a -not -name .\*.icloud -print0 | xargs -0 -I{} "$SHELL" -c "eval $_SAFER_EVICT; _safer_evict {}"
find "$1" -type f -not -name .DS_Store -a -not -name .\*.icloud -print0 | xargs -0 -I{} "$SHELL" -c "eval ${_SAFER_EVICT}; ls {}"
}
_evictall "$1"
```
## SQL
### Compare two queries
Use the following template to get the difference between two queries:
```sql
with q1 as (
)
, q2 as (
)
, missing_from_q2 as (
select *
from (
select * from q1
except
select * from q2
)
cross join (select 'missing from q2' as diff_description)
)
, missing_from_q1 as (
select *
from (
select * from q2
except
select * from q1
)
cross join (select 'missing from q1' as diff_description)
)
select * from missing_from_q2
union all
select * from missing_from_q1
```
References:
-
### [Amazon Redshift] Disable results caching for current session
```sql
set enable_result_cache_for_session to off;
```
References:
-
## Kubernetes
### Sync current git working tree to a k8s pod
This utility helps you sync your current git working tree with a remote k8s pod. This assumes that the project
is cloned under `/home/jovyan` on the remote pod. The repository name will be inferred from the current
repository using `git rev-parse --show-toplevel`. For this to work, you also need to have rsync installed in
the remote k8s pod (run: `sudo apt install rsync grsync`). Note that the `.git/` directory will not be synced.
In addition to this, nothing in `.gitignore` will be synced.
Simply add a copy of [snippets/k8s/krsync.zsh](snippets/k8s/krsync.zsh) and
[snippets/k8s/krsync-subshell.sh](snippets/k8s/krsync-subshell.sh) to the top level directory of your git
repository and run `./krsync.zsh my-pod`.
-
## Misc
### GitHub Markdown style on JetBrains IDEs
Inspired and adapted from
1. Open the `Preferences -> Language & Frameworks -> Markdown`
2. Copy the contents of [snippets/misc/github-markdown.css](snippets/misc/github-markdown.css) into the open
text box under `Custom CSS -> CSS rules`
### Custom playback rate for Udemy videos
```javascript
document.querySelector("video").playbackRate = 1.2
// The above line above should be enough as there should only be a single element
// document.querySelector(".video-player--video-player--1sfof").querySelector("video").playbackRate = 1.2
```
References:
-