for d in ./*; do  if [ -d "$d" ]; then  echo "$d";   fi; done

curdir=$(pwd); for folder in /path/to/Files/*; do [ -d "$folder" ] && cd "$folder"  && ./conv.sh; done; cd $curdir

for f in *; do	[ -d "$f" ] && cd "$f"  && ./conv.sh; done; cd ..

cat * > outputfname

find /path/to/directory/ -name *.csv -exec cat {} + > outputfname

sed -i.backupsuffix 's/SEARCH_REGEX/REPLACEMENT/g' INPUTFILE

sudo find . -xdev -type f -size +100M

for d in ./*; do  if [ -d "$d" ]; then  cd $d; rm *.mp3; cd .. ;   fi; done

rename -v  's/search regex/replacingstring/' *

ls | cat -n | while read n f; do mv "$f" `printf "2019-12-02-23-19-%02d.jpg" $n`; done

ls -1prt | grep -v "/$" | cat -n | while read n f; do mv -n "${f}" `$(printf "%04d" $n).${f#*.}`;

 (?!NO)

 ([^~]*)

for f in  *.pdf; do echo epub-thumbnailer "$f" "${f%.epub}.png"  800; done

for f in  *.pdf; do convert -thumbnail x300 -background white -alpha remove "$f"[0] "${f%.pdf}.png";done

mogrify  -format  webp -path thumbs -thumbnail 200x200 *.pdf[0]

mogrify  -format  webp -path thumbs -thumbnail 200x200 *.jpg
mogrify  -format  webp -path thumbs -thumbnail 200x200 *.gif[0]
mogrify  -format  webp -path thumbs -thumbnail 200x200 *.djvu[0]
mogrify  -format  webp -path thumbs -thumbnail 200x200 *.png

ffmpeg -i input.mp4 -ss HH:MM:SS -t hh:mm:ss -async 1 cut.mp4

ffmpeg -i inp.mp4 -r  1/1 $filename%03d.bmp

gifsicle --delay  10 --loopcount  0 *.gif >  out.gif

for f in *.webp; do mkdir $f.frames; anim_dump -folder $f.frames  $f; .convert $f.frames/*.png -delay 10 -loop 0 $f.gif; done;

sudo apt-get install jpegoptim

jpegoptim *.mp3 -m30

mogrify -path ./results -resize 50x50% -quality 80 -format jpg *.png

mogrify  -format  jpg  *.png

mogrify -path ./ -resize 50% -quality 80  *.jpg

convert *.jpg -auto-orient pictures.pdf

sudo apt-get install lame

lame -b bitrate *.mp3 *.mp3.minified

img2pdf $(find . -iname "*.jpg" | sort -V) -o ./document.pdf

ls -1 ./*jpg | xargs -L1 -I {} img2pdf {} -o {}.pdf; pdftk *.pdf cat output combined.pdf

img2pdf  *.jpg -o ./document.pdf

html {-filter: invert(100%)}

gs -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -sOutputFile=output.pdf input.pdf

gs -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -sOutputFile=output.pdf input.pdf

ps2pdf -dPDFSETTINGS=/ebook input.pdf output.pdf

convert -density 200x200 -quality 40 -compress jpeg input.pdf output.pdf

ffmpeg -i source.mp4 -c:v libx264 -b:v 0.5M -c:a aac -b:a 96k target.mp4

ffmpeg -i source.mp4 -c:v libx264 -b:v 1.5M -c:a aac -b:a 128k target.mp4

<!-- Required extensions: pymdownx.tasklist --> 

<!-- Required extensions: pymdownx.betterem, pymdownx.tilde, pymdownx.emoji, pymdownx.tasklist, pymdownx.superfences --> 

E:

Append .html to the file name if it is an HTML file but doesn't end in .html or similar

H:

Download files from other hosts, too

k:

After downloading convert any link in it so they point to the downloaded files

p:

Download anything the page needs for proper offline viewing

r:

recursively download all files in folder

wget link -O output-name

wget -i input.txt

wget -r -k -E -p link

wget -E -H -k -p link

if [[ $URL =~ d/(.*)/view ]]; then  FILEID=${BASH_REMATCH[1]}; else if [[ $URL =~ open.id=(.*)\" ]]; then  FILEID=${BASH_REMATCH[1]}; fi ; fi

wget --no-check-certificate "https://docs.google.com/uc?export=download&id=$FILEID" -O   "$FILENAME"

wget --load-cookies /tmp/cookies.txt "https://docs.google.com/uc?export=download&confirm=$(wget --quiet --save-cookies /tmp/cookies.txt --keep-session-cookies --no-check-certificate "https://docs.google.com/uc?export=download&id=$FILEID" -O- | sed -rn 's/.*confirm=([0-9A-Za-z_]+).*/\1\n/p')&id=$FILEID" -O "$FILENAME"  && rm -rf /tmp/cookies.txt

  $$...$$

  \[...\]

  \(...\)

dpkg --get-selections >  mylists.list