Some small, random but possibly useful snippets for various tasks for oblivious shell users
Output unique lines of a text file
cat diff.txt | sed "s/^[ \t]*//" | sort | uniq
Find content in file recursive
grep --include=*.sql -rnw . -e "pattern"
Concat the content of all alphabetically orderd txt files
find . -type f -name '*.txt' | sort | xargs cat 0 >> concat.txt
Find all filenames recursive and print them sorted
find . -exec ls -dl \{\} \; | awk '{print $9}' | sort
Replace file content
sed -i -e 's/foo/bar/g' filename
Remove empty lines from file
sed -i '/^$/d' file.txt
Execute command in every subfolder
find . -maxdepth 1 -type d \( ! -name . \) -exec bash -c "cd '{}' && pwd" \;
Find all entities not in persistence.xml
egrep -lir --include=*.java "@Entity" . | awk -F"/" '{print $NF}' | awk -F"." '{print $1}' | while read -r file ; do
if ! grep -q "$file" src/main/resources/META-INF/persistence.xml ;
then
echo "Missing entity $file"
fi
done
Pulls all git repos in subdirectories
find . -type d -mindepth 1 -maxdepth 1 -exec git --git-dir={}/.git --work-tree=$PWD/{} pull origin master \;
Convert every JPG in current folder to PNG
for image in *.jpg ; do magick "$image" "${image%.*}.png" ; done
Optimize every PNG in current folder
for image in *.png ; do optipng "$image" ; done
Find process that is using a particular port
sudo netstat -lpn | grep :8080
Scan wifi channels
sudo iwlist wlan0 scan | grep \(Channel
List of packages installed locally
dpkg -l
List files from package(s).
dpkg -L <packagename>
Restart Pulse Audio
pulseaudio -k && sudo alsa force-reload
Remove all containers
docker rm $(docker ps -a -q)
Remove all images
docker rmi $(docker images -q)
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