1、顯示/etc/下以非字母開頭 后面跟任意字符的文件或目錄

ls /etc/[^[:alpha:]]*

2、復(fù)制/etc/下以p開頭以非數(shù)字結(jié)尾的文件或目錄到/tmp/mytest1下

cp -r /etc/p*[^[:digit:]] /tmp/mytest1/

3、cat /etc/issue | tr a-z A-Z > /tmp/issue.out

4、

groupadd -g 2019 distro

root@test2:/etc:42

$tail -1 /etc/group

distro:x:2019:

useradd -u 1005 mandriva -g distro

useradd -u 1100 -d /home/linux mageia

echo magedu | passwd mageia --stdin

passwd -n 7 mageia

或者chage -m 7 mageia

userdel mandriva

useradd slackware -u 2002 -g distro -G peguin

usermod -s /bin/sh slackware? 沒有/bin/tcsh 用/bin/sh代替

usermod -aG admins slackware