find ./ -name 'laun *' | xargs grep 8881 Find 8881 in the beginning of the document laun
grep -rn --include = 'laun *' 8881 ./ Find 8881 in the beginning of the document laun
du -sh * current directory disk usage
du -s * | sort -nr | head selected the top surface 10
The state of the file system information df -h