1. 写一个脚本,判断当前系统上所有用户的shell是否为可登录shell(即用户的shell不是/sbin/nologin);分别这两类用户的个数;通过字符串比较来实现;
# awk -F: ‘{if($7!=”/sbin/nologin”) {printf “Logined user %s\n”,$1} else {printf “Nolginged user %s\n”,$1}}’ /etc/passwd | sort -t ‘ ‘ -k 1 | cut -d’ ‘ -f1-2 | uniq -c
2. 写一个脚本
(1) 获取当前主机的主机名,保存于hostname变量中;
(2) 判断此变量的值是否为localhost,如果是,则将当前主机名修改为www.magedu.com;
(3) 否则,则显示当前主机名;
#!/bin/bash
#
hostname=$(hostname)
if [[ $(echo “$hostname”) =~ ^localhost ]];then
echo “$hostname”
sed -i s@^localhost.*@www.magedu.com@ /etc/hostname
cat /etc/hostname
else
echo “$hostname”
fi
3. 写一个脚本,完成如下功能
(1) 传递一个磁盘设备文件路径给脚本,判断此设备是否存在;
(2) 如果存在,则显示此设备上的所有分区信息;
#!/bin/bash
#
[ $# -lt 1 ] && echo “At least one device name.” && exit 1
if [ $1 == $(fdisk -l | grep -E -o “^Disk /dev/(sd|hd)[a-z]” | cut -d’ ‘ -f2) ];then
echo -e “The device is existed, and the device disk partition is here:\n$(fdisk -l $1)”
else
echo “The device is not existed.”
fi
4、写一个脚本,完成如下功能
脚本能够接受一个参数;
(1) 如果参数1为quit,则显示退出脚本,并执行正常退出;
(2) 如果参数1为yes,则显示继续执行脚本;
(3) 否则,参数1为其它任意值,均执行非正常退出;
#!/bin/bash
#
[ $# -lt 1 ] && echo “At least on device name.” && exit 1
if [ $1 == $(fdisk -l | grep -E -o “^Disk /dev/(sd|hd)[a-z]” | cut -d’ ‘ -f2) ];then
echo -e “The device is existed, and the device disk partition is here:\n$(fdisk -l $1)”
else
echo “The device is not existed.”
fi
5、写一个脚本,完成如下功能
传递一个参数给脚本,此参数为gzip、bzip2或者xz三者之一;
(1) 如果参数1的值为gzip,则使用tar和gzip归档压缩/etc目录至/backups目录中,并命名为/backups/etc-20160613.tar.gz;
(2) 如果参数1的值为bzip2,则使用tar和bzip2归档压缩/etc目录至/backups目录中,并命名为/backups/etc-20160613.tar.bz2;
(3) 如果参数1的值为xz,则使用tar和xz归档压缩/etc目录至/backups目录中,并命名为/backups/etc-20160613.tar.xz;
#!/bin/bash
#
[ $# -lt 1 ] && echo “At least one name.” && exit 1
case $1 in
gzip)
tar -zcf /backups/etc-$(date +%Y%m%d).tar.gz /root/testdb &> /dev/null
echo “Gzip backup has finished.”
;;
bzip2)
tar -jcf /backups/etc-$(date +%Y%m%d).tar.bz2 /root/testdb &> /dev/null
echo “Bzip2 backup has finished.”
;;
xz)
tar -Jcf /backups/etc-$(date +%Y%m%d).tar.xz /root/testdb &> /dev/null
echo “Xz backup has finished.”
;;
*)
echo “Error, please input gzip, bzip or xz.”
exit 2
;;
esac
6. 写一个脚本,接受一个路径参数:
(1) 如果为普通文件,则说明其可被正常访问;
(2) 如果是目录文件,则说明可对其使用cd命令;
(3) 如果为符号链接文件,则说明是个访问路径;
(4) 其它为无法判断;
#!/bin/bash
#
[ $# -lt 1 ] && echo “At least one path name.” && exit 1
if [ -L $1 ];then
echo “It’s a chain.”
ls -l $1
elif [ -f $1 ];then
echo “It’s a file.”
ls -l $1
elif [ -d $1 ];then
echo “It’s a directory.”
cd $1 && pwd
else
echo “Can’t determinate it.”
fi
7. 写一个脚本,取得当前主机的主机名,判断
(1) 如果主机名为空或为localhost,或为”(none)”,则将其命名为mail.magedu.com;
(2) 否则,显示现有的主机名即可;
#!/bin/bash
#
echo “The original hostname is $(hostname).”
if [[ $(hostname) =~ ^localhost ]];then
sed -i s@^localhost.*@mail.magedu.com@ /etc/hostname
elif [[ $(hostname) =~ ^$ ]];then
echo “mail.magedu.com” > /etc/hosname
elif [[ $(hostname) =~ “none” ]];then
sed -i s@.*none.*@mail.magedu.com@ /etc/hostname
echo “$hostname”
else
echo “Hostname isn’t changed. The hostname is $(hostname)”
fi
echo “The current hostname is $(cat /etc/hostname).”
原创文章,作者:allen,如若转载,请注明出处:http://www.178linux.com/70311
评论列表(1条)
改hostname的那个步骤如果文件不存在呢~~~继续加油!