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;
#!/bin/bash
declare -i sum_login=0
declare -i sum_nologin=0
while read line;do
shell=$(echo $line|awk -F: '{print $NF}')
if [ "$shell" == "/sbin/nologin" ];then
let sum_nologin++
else
let sum_login++
fi
done </etc/passwd
echo "Can login: $sum_login"
echo "Cannot login: $sum_nologin"
执行结果: [root@centos6 script]# ./chkuser.sh Can login: 8 Cannot login: 17
2、写一个脚本
(1) 获取当前主机的主机名,保存于hostname变量中;
(2) 判断此变量的值是否为localhost,如果是,则将当前主机名修改为www.magedu.com;
(3) 否则,则显示当前主机名;
#!/bin/bash
hostname=$(hostname)
if [ "$hostname" == "localhost" ];then
hostname www.magedu.com
else
hostname
fi
[root@centos6 script]# ./chhn.sh www.magedu.com
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
if [ $# -lt 1 ];then
echo "Usage $0 arg1"
exit 1
fi
if [ -b $1 ];then
fdisk -l $1
else
echo "Invalid file!"
fi
执行结果: [root@centos6 script]# ./devinfo.sh /dev/tty0 Invalid file! [root@centos6 script]# ./devinfo.sh /dev/sda1 Disk /dev/sda1: 524 MB, 524288000 bytes 255 heads, 63 sectors/track, 63 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000
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
if [ $# -lt 1 ];then
echo "Usage $0 arg1"
exit 1
fi
while true;do
case $1 in
quit)
echo "Exit in 2 second..."
sleep 2
exit 0
;;
yes)
echo "Continue..."
break
;;
*)
echo "Unknown error,exit!"
exit 1
esac
done
echo "Execute complete!"
执行结果: [root@centos6 script]# ./argu.sh Usage ./argu.sh arg1 [root@centos6 script]# ./argu.sh quit Exit in 2 second... [root@centos6 script]# ./argu.sh yes Continue... Execute complete! [root@centos6 script]# ./argu.sh haha Unknown error,exit!
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;
(4) 其它任意值,则显示错误压缩工具,并执行非正常退出;
#!/bin/bash
if [ $# -ne 1 ];then
echo "Usage $0 arg1."
exit 1
fi
[ -d /backups ] || mkdir -p /backups
case $1 in
gzip)
tar -zcf /backups/etc-$(date +%Y%m%d).tar.gz /etc
;;
bzip2)
tar -jcf /backups/etc-$(date +%Y%m%d).tar.bz2 /etc
;;
xz)
tar Jcf /backups/etc-$(date +%Y%m%d).tar.xz /etc
;;
*)
echo "Invalid compress mode!"
exit 1
esac
执行结果: [root@centos6 script]# ll /backups total 22904 -rw-r--r-- 1 root root 8395375 Feb 13 19:34 etc-20170213.tar.bz2 -rw-r--r-- 1 root root 9527374 Feb 13 19:32 etc-20170213.tar.gz -rw-r--r-- 1 root root 5523792 Feb 13 19:34 etc-20170213.tar.xz
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
if [ $# -lt 1 ];then
echo "Usage $0 arg1."
exit 1
fi
if [ -L $1 ];then
echo "$1 is symbolic file."
elif [ -f $1 ];then
echo "$1 is regular file,you can read and write it."
elif [ -d $1 ];then
echo "$1 is directory,you can use the command cd to enter it."
else
echo "Unknown file type!"
fi
执行结果: [root@www script]# ./chktype.sh /etc/hosts /etc/hosts is regular file,you can read and write it. [root@www script]# ./chktype.sh /etc/redhat-release /etc/redhat-release is symbolic file. [root@www script]# ./chktype.sh /etc/ /etc/ is directory,you can use the command cd to enter it. [root@www script]# ./chktype.sh ddd Unknown file type!
7、写一个脚本,取得当前主机的主机名,判断
(1) 如果主机名为空或为localhost,或为”(none)”,则将其命名为mail.magedu.com;
(2) 否则,显示现有的主机名即可;
#!/bin/bash
if [ -z "$(hostname)" ] || [ "$(hostname)" == "localhost" ];then
hostname mail.magedu.com
echo "set 'mail.magedu.com' as new hostname."
else
hostname
fi
执行结果: [root@www script]# ./sethn.sh set 'mail.magedu.com' as new hostname. [root@www script]# hostname mail.magedu.com
8、写一脚本,接受一个用户名为参数;
(1) 如果用户的id号为0,则显示其为管理员;
(2) 如果用户的id号大于0且小于500, 则显示其为系统用户;
(3) 否则,则显示其为普通用户;
#!/bin/bash
if [ $# -lt 1 ];then
echo "Usage $0 arg1"
exit 1
fi
if ! id $1 &>/dev/null;then
echo "$1 not exists!"
exit 1
fi
uid=$(id -u $1)
if [ $uid -ge 500 ];then
echo "$1 is regular user."
elif [ $uid -gt 0 ];then
echo "$1 is system user."
else
echo "$1 is root."
fi
执行结果: [root@www script]# ./chkuser2.sh magedu magedu is regular user. [root@www script]# ./chkuser2.sh mysql mysql is system user. [root@www script]# ./chkuser2.sh root root is root. [root@www script]# ./chkuser2.sh hahaha hahaha not exists!
10、写一个脚本,传递一个用户名参数给脚本;
(1) 如果用户的id号大于等于500,且其默认shell为以sh结尾的字符串,则显示“a user can log system.”类的字符串;
(2) 否则,则显示无法登录系统;
#!/bin/bash
if [ $# -lt 1 ];then
echo "Usage $0 arg1."
exit 1
fi
if ! id $1 &>/dev/null;then
echo "$1 not exists!"
exit 1
fi
uid=$(id -u $1)
if [ $uid -ge 500 ] && grep "^$1.*sh$" /etc/passwd &>/dev/null;then
echo "$1 can login."
else
echo "$1 cannot login."
fi
执行结果: [root@www script]# ./chkuser3.sh magedu magedu can login. [root@www script]# ./chkuser3.sh nfc nfc cannot login.
11、写一个脚本,完成如下任务 :
(1) 按顺序分别复制/var/log目录下的每个直接文件或子目录至/tmp/test1-testn目录中;
(2) 复制目录时,才使用cp -r命令;
(3) 复制文件时使用cp命令;
(4) 复制链接文件时使用cp -d命令;
(5) 余下的所有类型,使用cp -a命令;
#!/bin/bash
declare -i j=1
for i in /var/log/*;do
[ ! -d /tmp/test$j ] && mkdir -p /tmp/test$j
if [ -L $i ];then
cp -d $i /tmp/test$j
elif [ -f $i ];then
cp $i /tmp/test$j
elif [ -d $i ];then
cp -r $i /tmp/test$j
else
cp -a $i /tmp/test$j
fi
let j++
done
执行结果:
[root@www tmp]# tree
.
├── test1
│ └── anaconda.ifcfg.log
├── test10
│ └── btmp
├── test11
│ └── ConsoleKit
│ └── history
├── test12
│ └── cron
├── test13
│ └── dmesg
├── test14
│ └── dmesg.old
├── test15
│ └── dracut.log
├── test16
│ └── lastlog
├── test17
│ └── maillog
├── test18
│ └── messages
├── test19
│ └── mysqld.log
├── test2
│ └── anaconda.log
├── test20
│ └── secure
├── test21
│ └── spooler
├── test22
│ └── tallylog
├── test23
│ └── wtmp
├── test24
│ └── yum.log
├── test3
│ └── anaconda.program.log
├── test4
│ └── anaconda.storage.log
├── test5
│ └── anaconda.syslog
├── test6
│ └── anaconda.xlog
├── test7
│ └── anaconda.yum.log
├── test8
│ └── audit
│ └── audit.log
└── test9
└── boot.log
原创文章,作者:N26-西安-方老喵,如若转载,请注明出处:http://www.178linux.com/70445


评论列表(1条)
完成的很好,脚本的思路清晰,加油!