linux exercise2

1.在student用户下执行find /etc -name passwd 命令,并管理其输出要求如下：
[student@localhost Desktop]$ find /etc -name passwd 2> file1
/etc/passwd
/etc/pam.d/passwd
2.显示所有正确输出，屏蔽错误输出
student@localhost Desktop]$ find /etc -name passwd 2> /tmp/find.err
/etc/passwd
/etc/pam.d/passwd
3.保存正确数出到/tmp/find.out,错误数出到/tmp/find.err中
[student@localhost Desktop]$ find /etc -name passwd > /tmp/find.out
find: ‘/etc/pki/CA/private’: Permission denied
find: ‘/etc/pki/rsyslog’: Permission denied
find: ‘/etc/audit’: Permission denied
find: ‘/etc/polkit-1/rules.d’: Permission denied
find: ‘/etc/polkit-1/localauthority’: Permission denied
find: ‘/etc/grub.d’: Permission denied
find: ‘/etc/selinux/targeted/modules/active’: Permission denied
find: ‘/etc/lvm/archive’: Permission denied
find: ‘/etc/lvm/backup’: Permission denied
find: ‘/etc/lvm/cache’: Permission denied
find: ‘/etc/dhcp’: Permission denied
find: ‘/etc/firewalld’: Permission denied
find: ‘/etc/audisp’: Permission denied
find: ‘/etc/sudoers.d’: Permission denied
find: ‘/etc/ipsec.d’: Permission denied
find: ‘/etc/libvirt’: Permission denied
find: ‘/etc/cups/ssl’: Permission denied
3.建立/tmp/find.all文件，并且保存所有输出到此文件中
[student@localhost Desktop]$ touch /tmp/find.all
[student@localhost Desktop]$ find /etc -name passwd &> /tmp/find.all
4. 再次保存所有输出到/tmp/find.all中，并且保持源文件内容
[student@localhost Desktop]$ find /etc -name passwd &>> /tmp/find.all
5.屏蔽此命令的所有输出
[student@localhost Desktop]$ find /etc -name passwd &> /dev/null