SHELL脚本练习

#!/bin/bash
S_O=head /etc/passwd | tail -1 | cut -d: -f3
S_T=head -20 /etc/passwd | tail -1 | cut -d: -f3
echo -e "/etc/passwd 文件中的第10个和第20个用户的ID之和为：e[1;33m$[${S_O}+${S_T}]e[0m"

2.编写脚本 sumspace.sh，传递两个?件路径作为参数给脚本，计算这两个?件中所有空??之和

#!/bin/bash
read -p "please input One path : " ONE_PATH
read -p "please input Two path : " TWO_PATH
S_ONE=grep "^$" ${ONE_PATH} |wc -l
S_TWO=grep "^$" ${TWO_PATH} |wc -l
echo "file spaces is : ${S_ONE} ${S_TWO}"
sum=$[${S_ONE}+${S_TWO}]
echo -e "${ONE_PATH}、${TWO_PATH} space sum is e[31m${sum}e[0m"

3.编写脚本 sumfile.sh,统计/etc,/var,/usr?录中共有多少个?级??录和?件

#!/bin/bash
read -p "please input first_dir_path : " FIRST
read -p "please input second_dir_path : " SECOND
read -p "please input three_dir_path : " THREE
FIR_F=find ${FIRST} -maxdepth 1 | wc -l
SEC_F=find ${SECOND} -maxdepth 1 | wc -l
THR_F=find ${THREE} -maxdepth 1 | wc -l
FIR_S=find ${FIRST} -maxdepth 1 -type d | wc -l
SEC_S=find ${SECOND} -maxdepth 1 -type d | wc -l
THR_S=find ${THREE} -maxdepth 1 -type d | wc -l
fir_dir=$[${FIR_S}+${SEC_S}+${THR_S}-3]
echo -e "e[1;33m${FIRST}、${SECOND}、${THREE}e[0m three first dirs sum : e[1;31m${fir_dir}e[0m"
SUM=$[${FIR_F}+${SEC_F}+${THR_F}]
echo -e "e[1;33m${FIRST}、${SECOND}、${THREE}e[0m three files sum : e[1;31m$[${SUM}-${fir_dir}]e[0m"

4.编写脚本 argsnum.sh，接受?个?件路径作为参数；如果参数个数?于1，则提??户“?少应该给?个参数”，并?即退出；如果参数个数不?于1，则显?第?个参数所指向的?件中的空??数

#!/bin/bash
[[ $# -lt 1 ]] && (echo "at least one argument"&&exit)|| echo -e "e[1;31m$1e[0m 文件空白行数为：e[1;33mgrep ‘^$‘ $1|wc -le[0m"

5.编写脚本 hostping.sh，接受?个主机的IPv4地址做为参数，测试是否可连通。如果能ping通，则提??户“该IP地址可访问” ；如果不可ping通，则提??户“该IP地址不可访问”

#!/bin/bash
read -p "please input IP：" IP
LOG_COLOR=‘e[1;31m‘
AND_COLOR=‘e[0m‘
A=[[ "$IP" =~ ^[0-9]{1,3}.[0-9]{1,3}$ ]];echo $?;
B=ping -c1 -w1 $IP &>/dev/null;echo $?;
if [ $A -eq 0 ];then
if [ $B -eq 0 ];then
echo -e "${LOG_COLOR}该IP地址可以访问${AND_COLOR}"
else
echo -e "${LOG_COLOR}该IP地址不可访问${AND_COLOR}"
fi
else
echo -e "${LOG_COLOR}IP 格式输入不正确${AND_COLOR}"
exit
fi

6.编写脚本 checkdisk.sh，检查磁盘分区空间和inode使?率，如果超过80%，就发?播警告空间将满

#!/bin/bash
disk=df|egrep /dev/sd|tr -s ‘ ‘ ‘%‘|cut -d% -f5|sort -nr|head -n1
inode=df -i|egrep /dev/sd|tr -s ‘ ‘ ‘%‘|cut -d% -f5|sort -nr|head -n1
[ $disk -ge 80 -o $inode -ge 80 ] && wall space will full.

7.编写脚本 per.sh,判断当前?户对指定参数?件，是否不可读并且不可写

#!/bin/bash
[ ! -r $1 -a ! -w $1 ] && echo "$1 is not read and write" || exit

8.编写脚本 excute.sh ，判断参数?件是否为sh后缀的普通?件，如果是，添加所有?可执?权限，否则提??户?脚本?件

#!/bin/bash
[[ $1 =~ .sh$ ]] && [ -f $1 ] && (chmod a+x $1;echo "$1 is .sh")||echo "$1 is not
.sh"

9.编写脚本 nologin.sh 和 login.sh，实现禁?和允许普通?户登录系统

#!/bin/bash
[ -f /etc/nologin ] && echo “nologin”|| (touch /etc/nologin;echo “nologin”)
!/bin/bash
[ -f /etc/nologin ] && ( rm -f /etc/nologin;echo “login”)||echo “login”

10.编写脚本 createuser.sh，实现如下功能：使??个?户名做为参数，如果指定参数的?户存在，就显?其存在，否则添加之；显?添加的?户的id号等信息

#!/bin/bash
read -p "please input username：" user
id $user &>/dev/null
[[ ! $? -eq 0 ]] && (useradd $user &> /dev/null && echo "add $user user") ||echo "the user is exits"

11.编写脚本 yesorno.sh，提??户输?yes或no,并判断?户输?的是yes还是no,或是其它信息

#!/bin/bash
read -p "please input yes or no :" ANS
[[ "$ANS" =~ ^(Yy?)$ ]] && echo yes
[[ "$ANS" =~ ^(Nn?)$ ]] && echo no

12.编写脚本 filetype.sh,判断?户输??件路径，显?其?件类型（普通，?录，链接，其它?件类型）

#!/bin/bash
read -p "please input file path: " PT
file $PT >/testdir/shell/test.txt
leixing=egrep -o "link|text|block|directory" /testdir/shell/test.txt
case $leixing in
text)
echo "the path is file"
;;
link)
echo "the path is Link"
;;
block)
echo "the path is Block"
;;
directory)
echo "the path is Directory"
;;
*)
echo "the path is Others"
esac

13.编写脚本 checkint.sh,判断?户输?的参数是否为正整数

#!/bin/bash
read?-p?"please?input?a?number:"?num
[[ $num =~ ^[0-9]+$ ]] && echo “$num is int”||{echo ”lease?input?a?number”;exit;}

14.让所有?户的PATH环境变量的值多出?个路径，例如
/usr/local/apache/bin

vim /etc/profile
export PATH=/usr/local/apache/bin:$PATH
source /etc/profile 生效

15.?户root登录时，将命令指?符变成红?，并?动启?如下别名：

rm=‘rm –i’
cdnet=‘cd /etc/sysconfig/network-scripts/’
editnet=‘vim /etc/sysconfig/network-scripts/ifcfg-eth0’
editnet=‘vim /etc/sysconfig/network-scripts/ifcfg-eno16777736 或
ifcfg-ens33 ’
(如果系统是CentOS7)
[[email?protected] ~]# vim ~/.bashrc
alias rm=‘rm –i‘
alias cdnet=‘cd /etc/sysconfig/network-scripts/‘
alias editnet1=‘vim /etc/sysconfig/network-scripts/ifcfg-eth0‘
alias editnet2=‘vim /etc/sysconfig/network-scripts/ifcfg-ens33‘
export PS1=‘[e[1;31m][[email?protected]h W]$[e[0m]‘ 红色
source ~.bashrc 生效

16.任意?户登录系统时，显?红?字体的警?提醒信息“Hi,dangerous！”

[[email?protected] ~]# vim /etc/issue
^[[031m " Hi,dangerous！" ^[[0m"

17.编写?成脚本基本格式的脚本，包括作者，联系?式，版本，时间，描述等

[[email?protected] ~]# vim .vimrc
set nu
set ignorecase
set cursorline
set autoindent
autocmd BufNewFile *.sh exec ":call SetTitle()"
func SetTitle()
if expand("%:e") == ‘sh‘
call setline(1,"#!/bin/bash")
call setline(2,"#")
call
setline(3,"#"
)
call setline(4,"#Author: w")
call setline(5,"#QQ: 1")
call setline(6,"#Date: ".strftime("%Y-%m-%d"))
call setline(7,"#FileName： ".expand("%"))
call setline(8,"#URL: http://www.magedu.com")
call setline(9,"#Description： The test script")
call setline(10,"#Copyright (C): ".strftime("%Y")." All rights
reserved")
call
setline(11,"#
")
call setline(12,"")
endif
endfunc
autocmd BufNewFile * normal G

18.编写脚本 systeminfo.sh,显?当前主机系统信息，包括主机名，IPv4地址，操作系统版本，内核版本， CPU型号，内存??，硬盘??

#!/bin/bash
LOG_COLOR=‘e[1;33m‘
AND_COLOR=‘e[0m‘
echo -e "当前主机信息如下："
echo -e "主机名：${LOG_COLOR}${HOSTNAME}${AND_COLOR}"
echo -e "IPV4 地址为：${LOG_COLOR}ifconfig | grep broadcast | tr -s " " | cut -d" " -f3"${AND_COLOR}
echo -e "操作系统版本为：${LOG_COLOR}uname -r"${AND_COLOR}
echo -e "内核版本为：${LOG_COLOR}cat /etc/redhat-release | cut -d"." -f1-2"${AND_COLOR}
echo -e "CPU型号为：${LOG_COLOR}lscpu | grep Model | tail -1 | tr -s ‘ ‘ | cut -d: -f2"${AND_COLOR}
echo -e "内存大小为：${LOG_COLOR}free -mh | head -2 | tail -1 | tr -s ‘ ‘ | cut -d" " -f2"${AND_COLOR}
echo -e "硬盘容量为：${LOG_COLOR}fdisk -l | head -2 | tail -1 | awk -F ‘:|,‘ ‘{print $2}‘"${AND_COLOR}

19.编写脚本 backup.sh，可实现每?将/etc/?录备份到/root/etcYYYY-mm-dd中

#!/bin/bash
cp /etc /testdir/etcdate +%F
echo "/etc 备份完成"

20.编写脚本 disk.sh,显?当前硬盘分区中空间利?率最?的值

#!/bin/bash
echo "当前硬盘分区中空间利用率最大的值为：df |grep /dev/sd |grep -o "[0-9]{1,3}%" | sort -rn | head -1"

21.编写脚本 links.sh,显?正连接本主机的每个远程主机的IPv4地址和连接数，并按连接数从?到?排序

#!/bin/bash
echo "正在连接本主机的每个远程主机的 IPV4 的地址和连接数为："
echo "netstat -tan | tr -s " " : | cut -d: -f6 | grep ^[0-9] | sort | uniq -c"

22.编写脚本 reset.sh,对新系统进行环境配置

#!/bin/bash
#字体颜色
LOG_COLOR=‘e[1;33m‘
AND_COLOR=‘e[0m‘
#网卡名
N_N=ifconfig|head -1 | tr -s " " : |cut -d: -f1#网卡配置文件所在目录D_NET="/etc/sysconfig/network-scripts/ifcfg-${N_N}"#yum源配置文件所在目录D_YUM="/etc/yum.repos.d/"#关闭seliunxsetenforce 0 &>/dev/nullsed -i ‘s#^SELINUX=.#SELINUX=disabled#g‘ /etc/selinux/configecho -e "${LOG_COLOR}SELINUX已经修改完毕，重启即生效。${AND_COLOR}"read -p "即将修改主机名，请给主机起一个可爱的名字吧：" HOST#更改主机名hostname ${HOST}cat >/etc/hostname <<EOF${HOST}EOFecho -e "${LOG_COLOR}名ok，接下来是yum配置${AND_COLOR}"#配置yum源mkdir /media/cdrom -p &>/dev/nullmount /dev/sr0 /media/cdrom &>/dev/nullmkdir ${D_YUM}backup &>/dev/nullmv ${D_YUM}C ${D_YUM}backupcat >>${D_YUM}CentOS.repo <<EOF[CentOS]name=CentOSbaseurl=file:///media/cdromgpgcheck=0EOFecho ‘/dev/sr0 /media/cdrom iso9660 defaults 0 0‘ >>/etc/fstabyum clean all &>/dev/nullyum makecache &>/dev/nullecho -e "${LOG_COLOR}yum配置完成。${AND_COLOR}"#关闭防火墙systemctl stop firewalld.service &>/dev/nullsystemctl disable firewalld.service &>/dev/nullecho -e "${LOG_COLOR}防火墙已经关闭，并禁止开机启动${AND_COLOR}"#更改IPread -p "接下来配置IPn请键入IP地址：" IPADread -p "请键入子网掩码：" NETread -p "请键入网关地址：" GATsed -i ‘s#^BOOT.*#BOOTPROTO=static#g‘ ${D_NET}cat >>${D_NET} <<EOFIPADDR=${IPAD}NETMASK=${NET}GATEWAY=${GAT}EOFsystemctl restart network.service &>/dev/nullecho -e "${LOG_COLOR}网卡配置已生效${AND_COLOR}"sleep 1echo -e "${LOG_COLOR}主机环境配置完成，系统自动重启 3...${AND_COLOR}"sleep 1echo -e "${LOG_COLOR}2..${AND_COLOR}"sleep 1echo -e "${LOG_COLOR}1...${AND_COLOR}"sleep 1reboot