# To find files by case-insensitive extension (ex: .jpg, .JPG, .jpG):
find . -iname "*.jpg"

# To find directories:
find . -type d

# To find files:
find . -type f

# To find files by octal permission:
find . -type f -perm 777

# To find files with setuid bit set:
find . -xdev \( -perm -4000 \) -type f -print0 | xargs -0 ls -l

# To find files with extension '.txt' and remove them:
find ./path/ -name '*.txt' -exec rm '{}' \;

# To find files with extension '.txt' and look for a string into them:
find ./path/ -name '*.txt' | xargs grep 'string'

# To find files with size bigger than 5 Mb and sort them by size:
find . -size +5M -type f -print0 | xargs -0 ls -Ssh | sort -z

# To find files bigger thank 2 MB and list them:
find . -type f -size +20000k -exec ls -lh {} \; | awk '{ print $9 ": " $5 }'

# To find files modified more than 7 days ago and list file information
find . -type f -mtime +7d -ls

# To find symlinks owned by a user and list file information
find . -type l --user=username -ls

# To search for and delete empty directories
find . -type d -empty -exec rmdir {} \;

# To search for directories named build at a max depth of 2 directories
find . -maxdepth 2 -name build -type d

# To search all files who are not in .git directory
find . ! -iwholename '*.git*' -type f

# Find all files that have the same node (hard link) as MY_FILE_HERE
find . -type f -samefile MY_FILE_HERE 2>/dev/null