1.for i in $(seq 0 9);do touch file$1;done
2.sort -k 1 -t ':' passwd | awk -F ':' '{ print $3":"$4":"$5}'
3.diff -B file1 file2
4.isodump -i out.iso -x /media/cdrom ; umount /media/cdrom #没有考虑cdrom被别的占用的情况
5.dd if=/dev/zero of=~/outfile bs=1G count=1
6.ifconfig eth0
7.netstat -a| grep tcp
8.tar cjf /buckup/home.tar.bz /home || rm -f /buckup/home.tar.bz