一个文件的内容如下：
ls chage alias dmesg chattr dd vi bc help cmp at bunzip2 bg
cd chfn env free chgrp df vimtutor expr info cut atq bzip2 fg
cp chsh export fuser chmod edquota vim wc lpq diff atrm gunzip jobs
mv groupadd history halt chown fdisk sed chsum lpr du batch gzip chkconfig
cat groupdel ldconfig lsof lsattr mkfs awk lprm emacs cron rar init
rm groupmod set reboot umask mount grep man file atd tar ntsysv
mkdir id soure shutdown quota tail whatis locate atrun unrar ps
rmdir last unalias slabtop quotaon head uniq crontab unzip kill
clear passwd umount sysctl swapoff find which date zip killall
pwd pwck exit top swapon strings pico cal compress sync
ln su enable uname umount xargs sort time rpm nohup
touch useradd fc uptime fsck tee md5sum sleep uncommpress pkill
less userdel unset vmstat fstab whereis mksock ac sort
more usermod egrep mktemp zcat
w fold mkfifo bzcat
who fgrep unlink tgz
tr ldd
access
zcat
wee fold mkfifo bzcat
whdo fgdrep unlink tgz
tr ldd
acdcess
#xargs -n1 <urfile |sort|uniq -dc
|
|
