Fun Unix commands

bash-cmds.md

Unix commands that make me happy

• Links

  • Find commands

• find commands

  • Find file by filename: find ./foo -name foo.txt
  • Find file by filename starts with / contains (case insensitive): find . -iname foo* find . -iname *foo* etc.
  • Find dir: find ./foo -type d -name bar
  • Find file by modification time: find ./foo -mtime -X or +X where X = number of days. So, +1 would find files modified more than one day ago.
  • Search for text within mult files: find ./ -type f -name "*.md" -exec grep 'foo' {} \;
  • Find and replace text in a range of files: find ./ -type f -exec sed -i '' 's/find/replace/g' {} \;
  • Find files by size: find . -type f -size +100M
  • Find files by size & print size in KB (requires findutils): gfind . -type f -size +3M -printf "%p %k KB\n"
  • Find files by size & print size in bytes: find . -type f -size +3M -exec stat -f "%z %N" {} \;
  • Find files by size & print fileinfo including -lh formatted size: find . -type f -size +3M -exec ls -lh \{\} \;

• grep commands

  • Find text by file ext.: grep 'foo' ./*.html

• Image Processing

  • Resize all images in cwd with H / W cap: sips -Z SOME_NUMBER *.jpg
  • ImageMagick
    • Resize all images in cwd maintaining aspect ratio - add padding where image does not fit mogrify -resize 500x600 -background white -gravity center -extent 500x600 *

• Zippin' Stuff

  • Zip entire dir: zip -r name_of_new_zip_file.zip dir_to_zip

• Logs

  • from log path: watch tail your_log_name_here.log

• Organizing Stuff

  • Replace any spaces in dir/file names with underscores: for f in *\ *; do mv "$f" "${f// /_}"; done
  • Replace text in file names (this example depth=1): for f in */*; do mv "$f" "${f//\.jpg\.jpg/\.jpg}"; done
  • Batch rename files: for i in *.jpg; do mv "$i" string_you_want_to_prepend"${i}"; done