ll -h

ls | xargs du -sh

df -h

du -smh *

cat 1.txt | more
tail -n 10 1.txt | grep uuid
head -n 10 1.txt

cp a.txt /tmp/
cp a.txt /tmp/b.txt
mv a.txt /tmp/
scp a.txt username@10.20.134.199:/home/username/

tar zxvf test.tar.gz

bzip2 -cd test.tar.bz2 > /tmp/test.txt