1、ls -d /etc/[^[:alpha:]][:alpha:]*
2、mkdir -p /tmp/mytest1;cp -rv /etc/p*[^[:digit:]] /tmp/mytest1/
3、cat /etc/issue|tr 'a-z' 'A-Z' > /tmp/issue.out
4、(1) groupadd -g 2019 distro
(2) useradd -u 1005 -g distro mandriva
(3) useradd -u 1100 -d /home/linux mageia
(4) echo "mageedu"|passwd --stdin mageia
passwd -x 7 mageia
(5) userdel mandriva
(6) groupadd peguin
useradd -u 2002 -g distro -G peguin slackware
(7) usermod -s /bin/tcsh slackware
(8) groupadd admins
usermod -aG admins slackware -s /sbin/nologin
5、useradd user1
useradd user2
useradd user3
mkdir /data/test
(1) chown user1:user1 /data/test
(2) chmod o=rw /data/test
(3) touch /data/test/a{1..4}.sh
chattr +i /data/test/a1.sh /data/test/a2.sh
chmod o+x /data/test/a3.sh /data/test/a4.sh
chmod o+t /data/test/a3.sh /data/test/a4.sh
(4) usermod -aG user1 user3
setfacl -mR u:user1:--- /data/test/
（5）setfacl -b /data/test
