Alright solutions for common-ish problems

Click a snippet to select-all thanks to the magic of CSS.

Find…

…a string in all files within a directory

• grep -ri "string" /path/to/directory
  • Case insensitive
  • Recursive

…and remove all of a filetype (JPG) within a directory

• find . -name "*.jpg" -type f -exec rm {} +
  • Recursive

Batch…

…rename all PNGs sequentially ordered by modification time

• i=1; for file in $(ls -tr *.png); do mv "$file" "$i.png"; i=$((i+1)); done

…combine all PDFs into one

• pdftk *.pdf cat output combined.pdf

…create directories “00” to “99”

• mkdir {00..99}

Export…

…all installed apt packages to a list

• dpkg --get-selections > pkgs.list

Import…

…a list of apt packages to installed

• dpkg --set-selections < pkgs.list