Linux commands

linux-cmds

// --------------------------------------------------
// Files and folders
-------------------------------------------------- //
// Copy specific file type keeping the folder structure
rsync -a --prune-empty-dirs --include '*/' --include '*.txt' --exclude '*' source/. dest
Ref: http://unix.stackexchange.com/a/83596

// Single line loop for repeated tasks with some variations on the command
arr=('jhon' 'jane' 'mike'); for name in "${arr[@]}"; do echo "$name"; done

// Set chmod for a folder and all of its subfolders and files
find /folder -type d -exec chmod 755 {} \;
Ref: http://stackoverflow.com/a/11512211

// Change entire folder/files permissions and ownership
chown -R username:group directory
Ref: http://askubuntu.com/a/6727

// Compare the size of two directories?
diff <(du -sh folder1) <(du -sh folder2)
Ref: http://stackoverflow.com/a/12560286/1946632

// Find out the web server user
lsof -i tcp:80
Ref: http://stackoverflow.com/a/18724971

// Create symbolic link (soft)
ln -s source/folder /folder

// --------------------------------------------------
// Killing a proccess running on especific port
-------------------------------------------------- //
// OPT-1
netstat -vanp tcp | grep 8000 | awk '{print $9}' | xargs kill -9
// OPT-2
// Discover pid
netstat -antp | grep {programName}
// Kill program by pid
kill -TERM {pid}

// --------------------------------------------------
// Extending logical volume disk
-------------------------------------------------- //
https://wiki.archlinux.org/index.php/LVM

// --------------------------------------------------
// Cleanup (remove cache, ununsed and old files)
-------------------------------------------------- //
http://br.ccm.net/faq/7272-fazer-uma-limpeza-no-ubuntu-residuos-de-configuracao-pacotes

// Find recursively (and optionally delete) files by extension
find . -name "*.bak" -iname
find . -name "*.bak" -iname -type f -delete
Referecen: https://goo.gl/UBgQ7h