oneliners.sh

# Rename files to lowercase
for i in `ls -1`; do mv $i "${i,,}" ; done

# Image view
for i in *.jpg; do echo "<img src='$i' />" >> images.html; done;

# updae all pip packages
pip freeze --local | grep -v '^\-e' | cut -d = -f 1  | xargs -n1 pip install -U

# find and replace foo with bar
ind ./ -type f -exec sed -i 's/foo/bar/g' {} \;

# find all txt file and display content
find /path/to/dir -name "*.txt" -type f -exec cat {} \;

# find js files in multiple locations
find ./foo ./bar ./baz -name "*.js"

# remove prefix or rename
for f in eremit*; do mv $f `sed "s/prefix_//g" <<< $f`; done

# find top 10 large files
find . -printf '%s %p\n'| sort -nr | head -10

# find large folders
du -cks * | sort -rn | head

# interface and ip address
ifconfig | awk '
/^[a-z]+/ {
  sub(/:/,"",$2); iface=$1 }
/^[[:space:]]*inet / {
  split($2, a, "/")
  print iface" : "a[1]
}'

# find and replace on a file
sed -i 's/foo/bar/g' file.txt

# convert png to svg
for f in *_shape.png; do convert $f -fill black -opaque white -alpha off $(echo $f | sed 's/\.png$/.pnm/') && potrace $(echo $f | sed 's/\.png$/.pnm/') -s -o $(echo $f | sed 's/\.png$/.svg/') && cp $(echo $f | sed 's/\.png$/.svg/g') my/new/folder/; done

#duplicate en folder to the names form a.txt file each line
while read -r p; do cp -rfv en $p; done < a.txt

# cd into every directory in current folder and run npm command
for d in */; do echo $d; cd $d; npm outdate; cd - > /dev/null; done

# Repair ext* file system
e2fsck -f -y -v -C 0 /dev/sdxx

# recusively set permission on www
find /A -type d -exec chmod 0755 {} \;
find /A -type f -exec chmod 0644 {} \;

# download website with wget
$ wget \
     --recursive \
     --no-clobber \ # don't overwrite any existing files (used in case the download is interrupted and resumed).
     --page-requisites \ # get all the elements that compose the page (images, CSS and so on).
     --html-extension \ # save files with the .html extension.
     --convert-links \ # convert links so that they work locally, off-line.
     --restrict-file-names=windows \ # modify filenames so that they will work in Windows as well.
     --domains website.org \ # don't follow links outside website.org.
     --no-parent \ # don't follow links outside the directory tutorials/html/.
         www.website.org/tutorials/html/ 

# resize /tmp
sudo echo 'tmpfs    /tmp    tmpfs    nodev,nosuid,size=4G    0    0' >> /etc/fstab

# The tmpfs can also be temporarily resized without the need to reboot.
sudo mount -o remount,size=4G,noatime /tmp

# Resize image
# View size
find . -type f -size +1000000c -exec identify -format "%[fx:w]x%[fx:h]" {} \;
#Find and resize
find . -type f -size +1000000c -exec mogrify -resize 2000000@ {} \;
#Optimize iamge bigger than 100kb
find . -type f -size +100000c -exec mogrify -strip -interlace Plane -gaussian-blur 0.05 -quality 85% {} \;

# watch file change and run command (sudo apt install inotify-tools)
while inotifywait -e close_write n.c; do gcc -o n n.c && ./n; done

# add prefix and sufix to list of files with file extension at the end (removes if file already exist with the exact name)
for file in RPT_*.sql; do newFile="dbo.${file%.sql}.StoredProcedure.sql" && rm $newFile; mv $file $newFile; done

# fix $'\r': command not found on windows cygwin
sed -i 's/\r$//' filename

# generate ssl certificate for web
openssl genrsa -des3 -out server.key 2048 #private key
openssl req -x509 -new -nodes -key server.key -sha256 -days 1825 -out server.pem #root certificate

# android sdcard backup
rsync -aHXxv --numeric-ids --progress -e 'ssh -p22 -T -o Compression=no -x' --exclude 'ADM/*.zip' --exclude 'ADM/*.apk' --exclude 'Download/*.zip' --exclude 'Download/*.apk' --exclude '*.x' --exclude 'Android' --exclude 'data' --exclude 'DCIM/.thumbnails' /sdcard/ user@host:~/3t/

# find and replace filename
rename 's/^123_//' *.js


# remove all file and folders with the name obj and bin
find . -maxdepth 2 -name obj -exec rm -rf {} \; && find . -maxdepth 2 -name bin -exec rm -rf {} \;


# copy files newer than given file to a location recursively
for x in `find . ! -path "./obj/*" -regex ".*\.\(aspx\|dll\|js\|css\|html\)$" -type f -newer frmLogin1.aspx.cs`; \
do cp --parents $x ~/Desktop/checklist/moneyswap-vip/bo/; \
done;

# transparent gif base64 image >> data:image/gif;base64,<base64>
convert -size 256x128 xc:transparent gif:- | base64

# To remove the duplicate lines preserving their order in the file use:
awk '!visited[$0]++' your_file > deduplicated_file

# base64 aws credentials
base64 ~/.aws/credentials  |  tr -d \\n

# Resice images and center image with backgrund color of specific area
cat thumbs | while read line
do
    c=$(convert $line -format "%[pixel:s.p{1,1}]" info:)
    convert -background "$c" $line -resize 320x200 -gravity center -extent 320x200 out/$line
done

# Find and delete directory older than 6 month
find . -maxdepth 3 -type d -name node_modules -mtime +180 -exec rm -rf {} \;