How to browse git diff of two hashes but exclude some files. In this case any file with test in the name won't be in the diff.

gd xxxsha001xxx...xxxsha002xxx -- $(gd --name-only xxxsha001xxx...xxxsha002xxx | rg --invert-match test)

"gd" == "git diff", via zsh git plugin

source

At work we use istanbul js for code coverage but at times the cli output is not enough to debug. Luckily istanbul also outputs a HTML report that can be viewed with the following command:

$ npx http-server ./coverage/lcov-report

I use the Bear Notes app on IOS which has a nice markdown export feature. From there it is easy to air drop the file to my mac then I paste it into my org notes after converting it.

$ pandoc -f markdown -t org -o note.org /tmp/md_note.md && pbcopy < /tmp/md_note.md

source: stackexchange

How to use a GPG key stored on a flash drive to encrypt files? I was perplexed for sometime. Eventually I figured out instead of exporting, importing, file system linking.. you just use a remote key ring that contains the keys you want!

1. Create the new key on the flash drive with

$ gpg --full-generate-key --homedir /Volumes/usb_flash_stick/key_homedir

2. Use that new public key to encrypt files

$ gpg --encrypt-files --homedir /Volumes/usb_flash_stick/key_homedir -r XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX ./file_a

This also bring the possibility of only storing the public key locally and having the secret key safe on the USB. See how to move keys snippet.

Before putting a tar file somewhere hard to access like S3 Glacier I note what is in it. I create a manifest file. Simply list the file names within:

$ tar tvf example.tar

With more automation worked in I came up with this:

• list all the tar files using fd (rust find replacment)
• list content of each one
• pipe that into a file for safe keeping

$ for x in $(fd -e tar) ; do (tar tvf "$x" && echo "\n") ; done > /tmp/example_manifest

To prevent upload errors to S3 Glacier I keep my files ~500mb. So larger ones must be split.

$ split -b 500mb example.txt example.txt.part

perl script example

Recently I've started using org-roam, so far so good. Utilizing capture buffers I create notes for work and my reefing aquarium hobby. Adding the roam tags manually became a pain so now I've figured out a way to prefill them with capture templates.

(setq org-roam-capture-templates
        '(("r" "reef" plain (function org-roam-capture--get-point)
           "%?"
           :file-name "%<%Y%m%d%H%M%S>-${slug}"
           :head "#+title: ${title}\n#+roam_tags: reef"
           :unnarrowed t)
          ("w" "work" plain (function org-roam-capture--get-point)
           "%?"
           :file-name "%<%Y%m%d%H%M%S>-${slug}"
           :head "#+title: ${title}\n#+roam_tags: work"
           :unnarrowed t)
          ("d" "default" plain (function org-roam-capture--get-point)
           "%?"
           :file-name "%<%Y%m%d%H%M%S>-${slug}"
           :head "#+title: ${title}\n"
           :unnarrowed t)))

source: https://www.reddit.com/r/orgmode/comments/lmlsdr/simple_question_re_orgroam_how_to_access_capture/

Normally I use

$ sudo systemctl restart nginx

but recently I had to take more drastic measures.

sudo pkill -f nginx & wait $!
sudo systemctl start nginx

source -- stackoverflow

npm run test -- $(git diff master --name-only | rg 'test.ts') --coverage=false

Easy way to remove audio from a video file using ffmpeg

ffmpeg -i $input_file -c copy -an $output_file

source: superuser

Part of my work process is taking lots of screenshot, ~5 per day. Then I back them up in AWS S3 Glacier once a month, using freeze app. Like to start with creating a regular tar file in /tmp.

$ tar cvf /tmp/pic_dump_14_10_20.tar ~/Desktop/**/*.png

Then append few more images. r in this case sanding for append..

$ tar rfv /tmp/pic_dump_14_10_20.tar ~/Pictures/resized/*

Now that the tar is complete I double check it by listing the files.

$ tar tf /tmp/pic_dump_14_10_20.tar

Lastly I need to compress the tar and I was confused if I could use tar command itself to compress a tar into a tar.gz but turns you use gunzip.

$ gzip /tmp/pic_dump_14_10_20.tar

source: https://alvinalexander.com/blog/post/linux-unix/how-work-files-tar-gzip-tgz/ (4)

Recently I was sshed into my home pi server trying to sftp some big files from a remote server. Some of the transfers are huge, 30gb+. On our internet that will take a while. Not wanting to leave the shh terminal session open that whole time I used screen on the pi. Idea was to create a screen session start the transfer detach and comeback few hours later. Detaching was a bit tricky. <Ctrl><a> <d> is the default detach command for both tmux running on my mac and screen running on the pi. So when I tried to detach from the screen session tmux would detach instead. 😡

After messing with configs and some searching turns out if you press the tmux prefix key twice it sends it once to the child shell. So eventually I was able to detach from the screen session with:

<Ctrl><a> <Ctrl><a> <d>!!

sources:

• stackoverflow
• screen basics

Today I discovered npm ci from a colleague. It does a clean install wiping out the node_modules before installing. For me this is perfect because I often find myself doing

$ rm -rf node_modules && npm i

no need just run npm ci

*note: you'll still want to do npm i when installing packages as npm ci does not update package*..

source:

• https://docs.npmjs.com/cli/install
• https://docs.npmjs.com/cli/ci

Sometimes when typing vim will automatically start a newline. This is an expected behavior but at times can be really annoying. Ex working with macros, you can recored one on a short line that breaks on longer lines 😟. The amount of text before vim will break to new line while typing is controlled via the textwidth setting. So a fix is pretty simple. If don't want the behavior just set textwidth to a big number. ex:

: set tw=500

Here is a asciicast of the problem and solution in action:

{{< asciicast-with-caption id="353148" title="demo of setting tw" >}}

source -- https://stackoverflow.com/questions/1272173/in-vim-how-do-i-break-one-really-long-line-into-multiple-lines

I use to always pass a key when sshing ex:

$ ssh -i ~/.ssh/de2 travis@vxxxxxxxxxxxxxxxxxxx.megasrv.de

That can be a bit annoying. I know two fixes:

add private key to ssh-agent

$ ssh-add ~/.ssh/de2

Now when you ssh you need not include the -i ~/.ssh/de2 because the ssh-agent will find it automatically.

*note: this resets once you reboot

configure individual host

You can configure individual hosts to use a spefic private key my editing your ~/.ssh/config:

Host de2
    HostName vxxxxxxxxxxxxxxxxxxxx.megasrv.de
    User travis
    IdentityFile ~/.ssh/de2

Now you only need to

$ ssh de2

source -- https://www.techrepublic.com/article/how-to-use-per-host-ssh-configuration/

It use to be when I was trying to ssh into one of my servers I would just: in the shell to get my fzz backwards command search, type ssh, then scroll up and down until I found the correct server. As my number of servers has grown this is no longer manageable because I don't remember which IPs align with with server. Time for some human readable names.

By adding something like this to your ~/.ssh/config:

Host de1
    HostName vxxxxxxxxxxxxxxxxxxxx.megasrv.de
    User travis

Host de2
    HostName vyyyyyyyyyyyyyyyyyyyymegasrv.de
    User travis

Host de3
    HostName vzzzzzzzzzzzzzzzzzzz.megasrv.de
    User travis

Host nyc1
    HostName 123.123.123.1233
    User travis

sshing becomes as easy as:

$ ssh de2

source -- https://www.techrepublic.com/article/how-to-use-per-host-ssh-configuration/

In this case disabling the user named ubuntu from logging in. This includes logging in via ssh.

$ sudo usermod --expiredate 1 ubuntu

This month I ditched XQuartz and am back to using Tmux. One part I found tedious was manually naming sessions. I wrote this little alias help. When run from outside a tux session to creates a new session named after the current directory. Ex when in /users/t.shears/dev/cool-app a session named cool-app is created.

Excerpt from my .zshrc

alias tmux_new="tmux new -s \$(pwd | awk -F "/" '{print \$NF}' | sed 's/\./_/g')"

How big are the fonts in this project? Not sure where they are even. This command finds the files using fd then prints file size.

$ fd woff | xargs du -h
 20K    src/assets/fonts/brandon_text_medium.woff2
 20K    src/assets/fonts/brandon_text_regular.woff2
 20K    src/assets/fonts/chronicle_light.woff2
 20K    src/assets/fonts/chronicle_roman.woff2
4.0K    types/woff
4.0K    types/woff2

Before I updated my OBS settings to record to .mp4 files I manually converted .mkv files to .mp4. This shell command does that for every recording in a directory deleting the original.

$ for x in $(ls *.mkv | awk -F "." '{print $1}') ; do ffmpeg -i $x.mkv -c copy $x.mp4 && rm $x.mkv ; sleep 3; done

Currently I run a shared mongo instance in my k8s cluster used by a bunch of my side projects. Every once in a while I have to manually execute mongo commands this is how I do so.

Manually ssh into the pod:

$ kubectl exec -it shared-mongo-xxxxxxxxxx-xxxxx -- /bin/bash

Then launch the mongo shell and hack away:

$ mongo
> db2 = db.getSiblingDB('coolDB')
coolDB
> db2.getCollectionNames()
[ "coolThings" ]
> db2.coolThings.count()
666
> db2.coolThings.remove({})
WriteResult({ "nRemoved" : 666 })
> db2.coolThings.count()
0

source:

• stackoverflow -- mongodb-how-to-delete-all-records-of-a-collection-in-mongodb-shell
• stackoverflow -- how-can-i-list-all-collections-in-the-mongodb-shell

Don't let those keys expire. 🚨

Time to edit some keys:

gpg --edit-key t@travisshears.com
Secret key is available.
sec  rsa2048/D4C2E4DFAB8BABF8
     created: 2018-07-18  expires: 2020-07-17  usage: SC
ssb  rsa2048/25C629D0FECC25B9
     created: 2018-07-18  expires: 2020-07-17  usage: E
ssb  rsa4096/97F7C2B46E6C5D11
     created: 2019-09-28  expires: 2023-09-28  usage: E

1. select key to change key 1
2. expire
3. duration: 1y
4. repeat until every key is updated

resulting output should be something like:

sec  rsa2048/D4C2E4DFAB8BABF8
     created: 2018-07-18  expires: 2021-06-22  usage: SC
ssb  rsa2048/25C629D0FECC25B9
     created: 2018-07-18  expires: 2021-06-22  usage: E
ssb  rsa4096/97F7C2B46E6C5D11
     created: 2019-09-28  expires: 2021-06-22  usage: E

lastly save and done

source:

• https://keithbeattyblog.wordpress.com/2019/05/04/how-to-extend-your-gpg-key/

New laptop? Got to move over those GPG keys.

$ cd /tmp && mkdir gpg_export
$ gpg --output gpg_export/main_pub.gpg --armor --export t@travisshears.com
$ gpg --output gpg_export/main_sec.gpg --armor --export-secret-key t@travisshears.com
$ tar cvfz gpg_export.tar.gz ./gpg_export
$ gpg --symmetric ./gpg_export.tar.gz

Then move the encrypted tar to the new computer, with airdrop for example.

To import the keys.

$ gpg --decrypt gpg_export.tar.gz.gpg > gpg_export.tar.gz
$ tar xvfz gpg_export.tar
$ gpg --import gpg_export/main_sec.gpg
$ gpg --import gpg_export/main_pub.gpg

Source:

• https://www.debuntu.org/how-to-importexport-gpg-key-pair/

Most of my personal projects are deployed via kubernetes. I write a lot of deployment.yaml files. In order to keep them clean and checked in to version control I keep sensitive env variables in a config maps. Problem is adding values env values to deployment.yaml files is pretty painful. This makes it a little less.

placed in yaml.json 😀 what a file name!

{
    "env var from configmap": {
        "prefix": "env",
        "body": [
            "- name: $1",
            "  valueFrom:",
            "    configMapKeyRef:",
            "      key: $1",
            "      name: configmapname"
        ],
        "description": "env varable from config map, remember to replace configmapname with your configmap name"
    }
}

Git bisect snippet

• https://git-scm.com/docs/git-bisect
• https://social.nixnet.services/@amolith/104315651903786804