Snippets

2 yr. ago

Add title attribute to link

Shell

Regex pattern to add link text to title attribute.

regex

url

Pattern
Replacement

# Find all <a> tags and capture href and text into groups 1, 2
# $1 is ([^"]+) matches any character except "
# $2 is ([^<]+) matches any character except <
<a\s+href="([^"]+)"[^>]*>([^<]+)</a>

2 yr. ago

Add user to group

Shell

Manage user group membership and permissions to ensure proper access control over directories and files.

chmod

chown

permissions

usermod

usermod
chown
group permissions
setgid

# Add user to primary_group
sudo usermod -aG primary_group user

4 wk. ago

Batch rename files

Shell

Batch rename files by removing a matching filename prefix.

batch

file

for f in Untitled-[0-9]*_[0-9]*_*; do mv -- "$f" "${f#Untitled-[0-9]*_[0-9]*_}"; done

2 yr. ago

Batch resize images

Shell

Batch resize and center images to a specific dimension.

batch

image

imagemagick

magick

# cd to directory with images
# adjust size as necessary 1427x803 (resize, extent)
# change output directory: ~/Downloads/output/"$file"
for file in *.jpg; do
  magick "$file" -gravity center -resize '1427x803^' -extent 1427x803 ~/Downloads/output/"$file"
done

3 mo. ago

Check dirty Git repos

Shell

Recursively find Git repositories with uncommitted changes, unpushed commits or missing upstream branches.

git

recursive

repository

status

for repo in **/.git(N/:h); do
  dirty=$(git -C "$repo" status --porcelain 2>/dev/null)
  unpushed=$(git -C "$repo" log @{u}..HEAD --oneline 2>/dev/null)
  no_upstream=$(git -C "$repo" rev-parse --abbrev-ref @{u} 2>&1 | grep -q "no upstream" && echo "No upstream branch configured")

  if [[ -n "$dirty" || -n "$unpushed" || -n "$no_upstream" ]]; then
    echo "========================================"
    echo "  $repo"
    echo "========================================"
    [[ -n "$dirty" ]] && echo "[Uncommitted Changes]\n$dirty\n"
    [[ -n "$unpushed" ]] && echo "[Unpushed Commits]\n$unpushed\n"
    [[ -n "$no_upstream" ]] && echo "[Warning] $no_upstream\n"
  fi
done

3 mo. ago

Compress multiple videos for mobile

Shell

Batch compress MP4 videos into smaller mobile-friendly HEVC files with preserved audio.

batch

compression

ffmpeg

video

# Input file: "$f"
# Duration limit: first 7 seconds (-to 7)
# Dynamic scale filter: sets max width/height to 480 while keeping aspect ratio (handles  landscape & portrait)
# Video codec: x265 (HEVC)
# CRF: 28 (constant rate factor quality setting)
# Tag: hvc1 FourCC flag for native macOS / QuickTime / iOS compatibility
# Audio: copy stream directly without re-encoding
# Output file: replaces .mp4 extension with _small.mp4
for f in *.mp4; do
  ffmpeg -i "$f" -to 7 -vf "scale='if(gt(iw,ih),480,-2)':'if(gt(iw,ih),-2,480)'" -c:v libx265 -crf 28 -tag:v hvc1 -c:a copy "${f%.mp4}_small.mp4"
done

2 yr. ago

Compress multiple videos script

Shell

A script to compress all videos in a directory using ffmpeg.

compression

ffmpeg

script

video

Shell script
Commands

_#!/bin/bash

# Default values
vcodec="libx265"
acodec="aac"
abitrate="128k"
output_format="mkv"
crf=28
preset="medium"

# Dynamic video tag variable
if [[ "$vcodec" == "libx265" ]]; then
  video_tag="-tag:v hvc1"
elif [[ "$vcodec" == "libx264" ]]; then
  video_tag="-tag:v avc1"
else
  video_tag=""
fi

# Function to show usage
usage() {
echo "Usage: $0 [options]"
echo "Options:"
echo "  --vcodec [libx264|libx265]   Video codec (default: libx265)"
echo "  --acodec [aac|mp3]           Audio codec (default: aac)"
echo "  --abitrate [128k|192k]       Audio bitrate (default: 128k)"
echo "  --output-format [mp4|mkv]    Output format (default: mkv)"
echo "  --crf [value]                Constant Rate Factor (default: 28)"
echo "  --preset [preset]            Encoding preset (default: medium)"
echo "  --help                       Show this help message"
exit 1
}

# Parse command-line arguments
while [[ $# -gt 0 ]]; do
case "$1" in
    --vcodec)
    vcodec="$2"
    shift 2
    ;;
    --acodec)
    acodec="$2"
    shift 2
    ;;
    --abitrate)
    abitrate="$2"
    shift 2
    ;;
    --output-format)
    output_format="$2"
    shift 2
    ;;
    --crf)
    crf="$2"
    shift 2
    ;;
    --preset)
    preset="$2"
    shift 2
    ;;
    --help)
    usage
    ;;
    *)
    echo "Unknown option: $1"
    usage
    ;;
esac
done

# Create the output directory if it doesn't exist
mkdir -p output

# Process video files
for file in *.{mp4,mov,avi,mkv}; do
# Skip if no files are found
[ ! -e "$file" ] && continue

# Get creation date from metadata
timestamp=$(ffprobe -v quiet -select_streams v:0 -show_entries format_tags=creation_time -of default=noprint_wrappers=1:nokey=1 "$file")

# Format the timestamp to your desired format YYYY-MM-DD-HH-MM-SS
formatted_timestamp=$(date -j -f "%Y-%m-%dT%H:%M:%S" "${timestamp%.*}" "+%Y-%m-%d-%H-%M-%S" 2>/dev/null)

# If the timestamp is empty, use the current time instead
[ -z "$formatted_timestamp" ] && formatted_timestamp=$(date "+%Y-%m-%d-%H-%M-%S")

# Compress the video
ffmpeg -i "$file" -vcodec "$vcodec" -crf "$crf" -preset "$preset" -c:a aac "$acodec" -b:a "$abitrate" "$video_tag" "output/${formatted_timestamp}.${output_format}"
done

2 yr. ago

Compress video

Shell

Compress a video using the H.265 (HEVC) codec for a balance of quality and size.

compression

ffmpeg

video

# Input: input.mp4
# Video codec: x265 (HEVC)
# CRF: 28 (default), recommended range 18-28
# Encoding preset: medium (default), faster|fast|medium|slow|slower, etc.
# Audio codec: aac
# Audio bitrate: 128k (default), 96k|128k|192k|320k
# Video tag: hvc1, can help with compatibility issues
# Output: output.mp4
ffmpeg -i input.mp4 -vcodec libx265 -crf 28 -preset medium -c:a aac -b:a 128k -tag:v hvc1 -metadata creation_time="2024-05-12T14:33:00Z" output.mp4

2 mo. ago

Download video

Shell

Download an HLS video stream from an M3U8 playlist and save it as an MP4 without re-encoding the video or audio.

download

ffmpeg

hls

m3u8

stream

video

# -i: Input M3U8/HLS playlist URL.
# -c copy: Copy the existing video and audio streams without re-encoding.
# -bsf aac_adtstoasc: Convert AAC audio from ADTS to the format expected by MP4.
ffmpeg -i "https://your-link.tld/xxxxxxxxx.m3u8" -c copy -bsf:a aac_adtstoasc output.mp4

2 yr. ago

Expand scrollable elements

CSS

Make all elements fully visible by removing scroll, position and height limits for screenshots.

height

overflow

position

screenshot

scroll

* {
    overflow: visible !important;
    height: auto !important;
    max-height: none !important;
    position: static !important;
}

2 yr. ago

Extract screenshot from videos

Shell

Extract screenshot from videos at a specific timestamp using ffmpeg.

ffmpeg

processing

screenshot

for f in *.mp4; do ffmpeg -ss 5 -i "$f" -frames:v 1 "${f%.mp4}.jpg"; done

2 yr. ago

File safe date string

Javascript

Returns a date time string that is safe to use for filenames.

date

filename

utility

// output: 2025-04-04_17-44-19
const getFileSafeDateString = () => {
    const date = new Date();

    const time = date.toLocaleTimeString(undefined, { hour12: false });
    const hour = time.slice(0, 2);

    const utcDate = new Date().toISOString();

    const updatedDateHour = utcDate.replace(/T\d+/, `_${hour}`);
    const formattedDate = updatedDateHour.replace(/:/g, "-");

    return formattedDate.split(".")[0];
}

2 yr. ago

Find directories by name

Shell

Search for directories matching a specific name pattern across the entire filesystem.

directories

find

# change nix for search term
sudo find / -type d -iname '*nix*' 2>/dev/null

9 mo. ago

Find largest files

Shell

List the largest files in a directory with optional limits.

filesystem

find

head

Function
Example

largest_files() {
  local search_dir="${1:-.}"
  local num_results="${2:-10}"
  echo "Searching in: $search_dir for the top $num_results files..."
  /usr/bin/find "$search_dir" -type f -exec /usr/bin/du -ah {} + 2>/dev/null | /usr/bin/sort -rh | /usr/bin/head -n "$num_results"
}

10 mo. ago

Force quit app

Shell

Kill a running application process from the command line using pkill.

pkill

pkill -f "/Applications/Google Chrome.app"

3 mo. ago

Lighten video

Shell

Enhance dark or underexposed videos in FFmpeg by improving brightness, clarity and overall visual quality while preserving a natural look.

brightness

ffmpeg

flickering

shadows

video

Method 1
Method 2

# To make brighter adjust +20 in increments of 10
ffmpeg -i input.mp4 -vf "hqdn3d=1.5:1.5:3:3,lutyuv=y='val+20*(1-val/255)':u='val':v='val',eq=contrast=1.08:saturation=1.15" -c:v libx265 -crf 20 -tag:v hvc1 -metadata creation_time="2025-11-21T14:33:00Z" -c:a copy output.mp4

3 mo. ago

Merge audio and video

Shell

Merge matching MP4 and MP3 files into a single MP4 without re-encoding the video.

audio

batch

ffmpeg

muxing

video

# Input video file: "$f"
# Input audio file: matching base name with .mp3 extension
# Video codec: copy stream directly without re-encoding
# Audio codec: AAC (recommended for MP4 container compatibility)
# Map streams: explicit 0:v (video from mp4) and 1:a (audio from mp3)
# Shortest flag: automatically stops encoding when the shortest input stream (the video) ends
# Output file: replaces .mp4 extension with _audio.mp4
for f in *.mp4; do
  ffmpeg -i "$f" -i "${f%.mp4}.mp3" -c:v copy -c:a aac -map 0:v:0 -map 1:a:0 -shortest "${f%.mp4}_audio.mp4"
done

2 yr. ago

Monoscopic 360° to stereoscopic 180° video

Shell

Use FFmpeg to transform a monoscopic 360° video into a side-by-side stereoscopic 180° VR format.

ffmpeg

# change input file: input_360.mp4
# Use HEVC (H.265) for better compression: -c:v libx265
# Increase bitrate for better quality: -b:v 20M
ffmpeg -i input_360.mp4 -filter_complex "
[0:v]v360=input=equirect:output=fisheye:h_fov=180:v_fov=180:yaw=-45[left];
[0:v]v360=input=equirect:output=fisheye:h_fov=180:v_fov=180:yaw=45[right];
[left][right]hstack" -c:v libx264 -crf 18 -preset slow -pix_fmt yuv420p output_vr180.mp4

2 yr. ago

Outlook group to CSV

Javascript

Parses a semicolon-separated string of contact entries from an expanded Outlook distribution list into a CSV format.

csv

parser

import fs from "fs";

const input = `Abercrombie, Clarence L. <[email protected]>; Abushawish, Maysaa Z <[email protected]>; Adams, Benjamin <[email protected]>; Anderson, A.K. <[email protected]>; Bond, Sr., Jamie <[email protected]>; Castilla Candil, Luis <[email protected]>; Castillo-Bernal, Melba <[email protected]>; Chang, Shun-Yao <[email protected]>; Chou, Yi Jou <[email protected]>; Crouse, Sr, Jake W. <[email protected]>; Richards, Jr., Robert C <[email protected]>`;

function parseOutlookGroupToCsv() {
  const lines = input
    .split(";")
    .map((entry) => entry.trim())
    .filter(Boolean)
    .map((entry) => entry.replace(/\b(Jr\.?|Sr\.?|II|III|IV|V),?/gi, "").trim())
    .map((entry) => {
      const match = entry.match(/^(.*?),\s*(.*?)\s*<([^>]+)>$/);
      if (!match) return null;

      let [_, lastName, firstPart, email] = match;
      if (/test/i.test(email)) return null;

      let nameParts = firstPart.split(/\s+/);

      if (nameParts.every((p) => /^[A-Z](\.?)$/.test(p))) {
        return `${lastName},${nameParts.join(" ")},${email}`;
      }

      nameParts = nameParts.filter((p) => !/^[A-Z]\.?$/.test(p));
      const firstName = nameParts.join(" ");
      return `${lastName},${firstName},${email}`;
    })
    .filter(Boolean);

  return ["lastName,firstName,email", ...lines].join("\n");
}

const csv = parseOutlookGroupToCsv();
fs.writeFileSync("output.csv", csv);

2 yr. ago

Paste to file over ssh

Shell

Quickly paste clipboard content into a remote file over ssh using pbpaste and cat.

cat

pbpaste

ssh

# Content must be on your clipboard before executing
pbpaste | ssh {{USERNAME_VAR}}@{{CLIENT_IP_VAR}} 'cat > /path/to/file'

10 mo. ago

Photoshop auto-fit layer

Javascript

Markdown

Instantly resize layer to fit your artboard.

auto-fit

images

layers

photoshop

Script
Action instructions

#target photoshop

var doc = app.activeDocument;
var layer = doc.activeLayer;
var bounds = layer.bounds;

var layerWidth = bounds[2].as('px') - bounds[0].as('px');
var layerHeight = bounds[3].as('px') - bounds[1].as('px');

var scaleW = (doc.width.as('px') / layerWidth) * 100;
var scaleH = (doc.height.as('px') / layerHeight) * 100;

var finalScale = Math.min(scaleW, scaleH);

layer.resize(finalScale, finalScale, AnchorPosition.MIDDLECENTER);
layer.translate(doc.width/2 - (bounds[0] + bounds[2])/2, doc.height/2 - (bounds[1] + bounds[3])/2);

10 mo. ago

Photoshop batch resize images

Javascript

Batch resize images to a specific canvas size, centers them and exports them as a png or jpg.

batch

images

photoshop

#target photoshop
// update these vars below: targetW, targetH
// toggle comment Save as PNG or JPG

(function () {
    // Prompt user to select input folder
    var inputFolder = Folder.selectDialog("Select the folder with images to process:");
    if (!inputFolder) {
        alert("No folder selected. Exiting.");
        return;
    }

    // Prompt user to select output folder
    var outputFolder = Folder.selectDialog("Select the folder to save processed images:");
    if (!outputFolder) {
        alert("No output folder selected. Exiting.");
        return;
    }

    var files = inputFolder.getFiles(/\.(jpg|jpeg|png|tif|tiff|bmp)$/i);
    if (files.length === 0) {
        alert("No image files found in selected folder.");
        return;
    }

    // Set target canvas dimensions
    var targetW = 1500;
    var targetH = 1000;

    for (var i = 0; i < files.length; i++) {
        var file = files[i];
        if (!(file instanceof File)) continue;

        var doc = open(file);
        app.activeDocument = doc;
        doc.changeMode(ChangeMode.RGB);

        // Resize proportionally to fit inside target dimensions
        var w = doc.width.as("px");
        var h = doc.height.as("px");
        var scale = Math.min(targetW / w, targetH / h);
        doc.resizeImage(UnitValue(w * scale, "px"), UnitValue(h * scale, "px"), null, ResampleMethod.BICUBIC);

        // Create transparent canvas
        var tempDoc = app.documents.add(
            targetW, targetH, doc.resolution, "TempCanvas", NewDocumentMode.RGB, DocumentFill.TRANSPARENT
        );

        // Copy/paste from resized image
        app.activeDocument = doc;
        doc.selection.selectAll();
        doc.selection.copy();
        doc.close(SaveOptions.DONOTSAVECHANGES);

        app.activeDocument = tempDoc;
        tempDoc.paste();
        var layer = tempDoc.activeLayer;

        // Center the pasted layer
        var dx = (targetW - (layer.bounds[2].as("px") - layer.bounds[0].as("px"))) / 2 - layer.bounds[0].as("px");
        var dy = (targetH - (layer.bounds[3].as("px") - layer.bounds[1].as("px"))) / 2 - layer.bounds[1].as("px");
        layer.translate(dx, dy);

        // Save as PNG
        var saveFile = new File(outputFolder + "/" + decodeURI(file.name).replace(/\.[^\.]+$/, "") + ".png");
        var pngOptions = new PNGSaveOptions();
        pngOptions.compression = 9;
        pngOptions.interlaced = false;
        tempDoc.saveAs(saveFile, pngOptions, true, Extension.LOWERCASE);

        // Save as JPG
        // var saveFile = new File(outputFolder + "/" + decodeURI(file.name).replace(/\.[^\.]+$/, "") + ".jpg");
        // var jpgOptions = new JPEGSaveOptions();
        // jpgOptions.quality = 12;
        // jpgOptions.formatOptions = FormatOptions.STANDARDBASELINE;
        // jpgOptions.embedColorProfile = true;
        // jpgOptions.matte = MatteType.NONE;
        // tempDoc.saveAs(saveFile, jpgOptions, true, Extension.LOWERCASE);

        tempDoc.close(SaveOptions.DONOTSAVECHANGES);
    }

    alert("Done! Saved " + files.length + " images as " + targetW + "x" + targetH + " to:\n" + outputFolder.fsName);
})();

2 yr. ago

Remove whitespace svg

Javascript

HTML

Paste svg to remove unnecessary whitespace.

cleanup

svg

viewBox

whitespace

Script
Markup

const originalSvg = document.querySelector("#originalSvg");
const newSvg = document.querySelector("#newSvg");

const delay = (ms) => new Promise((resolve) => setTimeout(resolve, ms));

originalSvg.addEventListener("paste", async () => {
    await delay(1);

    const tempContainer = document.createElement("div");
    tempContainer.innerHTML = originalSvg.value;
    document.body.appendChild(tempContainer);

    await delay(1);

    const svg = tempContainer.querySelector("svg");

    if (svg) {
    const { x, y, width, height } = svg.getBBox();
    svg.setAttribute("viewBox", `${x} ${y} ${width} ${height}`);
    newSvg.value = svg.outerHTML;
    }

    tempContainer.remove();
});

2 yr. ago

Responsive grid columns

CSS

Responsive, equally sized grid columns that wrap for mobile.

grid

.el {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr));
    gap: 20px;
}

2 yr. ago

Responsive table

CSS

HTML

Responsive table that stacks on mobile.

table

Styles
Markup

@media (max-width: 800px) {
    .table-vertical tbody tr {
        display: flex;
        flex-direction: column;
        padding-top: calc(0.25rem + 8px);
        border-bottom: 1px solid #eee;
    }
    .table-vertical tbody tr td:nth-of-type(1) {
        width: fit-content;
        margin-bottom: 0.5rem;
        padding: 0.25rem 0.5rem;
        background-color: rgba(138, 110, 75, 0.2);
        font-size: 16px;
        border-radius: 0 5px 5px 0;
    }
    .table-vertical tbody tr td:nth-of-type(2) {
        padding-left: 0.5rem;
        font-weight: bold;
        border-top: none;
    }
}

2 yr. ago

Rsync local and remote examples

Shell

Text

Learn how to sync files between drives or remote systems using rsync.

backup

file sync

rsync

Local
Remote
Exclude list

rsync -av --progress --delete-before --exclude-from="exclude-list.txt" /path/to/HDD1 /path/to/HDD2

2 yr. ago

Scrape links from url

Javascript

Extract text and links from anchor tags and generate HTML in a new window.

links

dom

url

// Refine the selector for a more specific search
const anchors = Array.from(document.querySelectorAll("a"));
const linkData = anchors.map(anchor => {
    const nameText = anchor.textContent?.replace(/\s+/g, " ").trim() || "";
    const cleanLink = anchor.href;
    return [nameText, cleanLink];
}).filter(([name, link]) => name && link);

function makeViews() {
    const list = `<ul>${linkData.map(([name, link]) =>
    `<li><a href="${link}" target="_blank">${name}</a></li>`).join("")}</ul>`;

    const paragraph = linkData.map(([name, link]) =>
    `<p><a href="${link}" target="_blank">${name}</a></p>`).join("");

    const tableRows = linkData.map(([name, link]) =>
    `<tr><td>${name}</td><td><a href="${link}" target="_blank">${link}</a></td></tr>`).join("");

    const table = `
        <table border="1" style="border-collapse: collapse; width: 100%;">
            <thead>
                <tr>
                    <th>Name</th>
                    <th>Links</th>
                </tr>
            </thead>
            <tbody>
                ${tableRows}
            </tbody>
        </table>
    `;

    const newWindow = window.open("");
    if (newWindow) {
        // Change to desired view (list, paragraph, table)
        newWindow.document.body.innerHTML = paragraph;
    }
}

makeViews();

5 mo. ago

Selective file sync

Shell

Text

Scripts for finding files by name, building transfer lists and syncing matched files to another system.

bash

files

rsync

shell

utils

Movies script
Movies list
TV shows script
TV shows list

#!/usr/bin/env bash

set -Eeuo pipefail

START_DIR="/path/to/your/directory"
FILENAME_LIST="./movies.txt"
DESTINATION="{{HOSTNAME_VAR}}:~/incoming/movies/"
ERROR_LOG="./error.log"

: > "$ERROR_LOG"

log_error() {
    echo "[$(date '+%F %T')] $*" >> "$ERROR_LOG"
}

trap 'log_error "Script failed on line $LINENO with exit code $?"' ERR

[[ -d "$START_DIR" ]] || {
    log_error "START_DIR does not exist: $START_DIR"
    exit 1
}

[[ -f "$FILENAME_LIST" ]] || {
    log_error "FILENAME_LIST does not exist: $FILENAME_LIST"
    exit 1
}

declare -a movie_paths=()

while IFS= read -r filename || [[ -n "$filename" ]]; do
    [[ -z "$filename" ]] && continue
    [[ "${filename:0:1}" == "#" ]] && continue

    matches=()

    while IFS= read -r path; do
        matches+=("$path")
    done < <(
        find "$START_DIR" -type f \
            \( -iname "${filename}.mp4" -o -iname "${filename}.mkv" \) \
            -exec realpath {} \; \
            2>>"$ERROR_LOG"
    )

    if [[ ${#matches[@]} -eq 0 ]]; then
        log_error "No matches found for: $filename"
        continue
    fi

    movie_paths+=("${matches[@]}")

done < "$FILENAME_LIST"

mapfile -t movie_paths < <(
    printf '%s\n' "${movie_paths[@]}" | sort -u
)

if [[ ${#movie_paths[@]} -eq 0 ]]; then
    log_error "No files matched any entries."
    exit 1
fi

echo "Found ${#movie_paths[@]} files."
echo "Files to transfer:"
printf '  %s\n' "${movie_paths[@]}"

for src in "${movie_paths[@]}"; do
    filename=$(basename "$src")
    movie_dir="${filename%.*}"

    echo "Copying:"
    echo "  $src"
    echo "  -> ${DESTINATION}${movie_dir}/"

    rsync -avh --progress \
        "$src" \
        "${DESTINATION}${movie_dir}/" \
        2>>"$ERROR_LOG"
done