Linux基礎shell腳本題
解:vim /root/bin/sumid.sh
#!/bin/bash
tenuser=`cat /etc/passwd | head -n10 | tail -n1 |cut -d: -f3`
twentyuser=`cat /etc/passwd | head -n20 |tail -n1 | cut -d: -f3`
let sum=$[tenuser+twentyuser]
echo "The tenuser and twentyuser finally is $sum"
2、編寫腳本/root/bin/sumspace.sh，傳遞兩個文件路徑作為參數給腳本，計算這兩個文件中所有空白行之和
解:vim /root/bin/sumspace.sh
#!/bin/bash
first=`cat $1 | grep "^[[:space:]]*$" | wc -l`
second=`cat $2 | grep "^[[:space:]]*$" | wc -l`
let sum=$[first+second]
echo $sum
3、編寫腳本/root/bin/sumfile.sh,統計/etc, /var, /usr目錄中共有多少個一級子目錄和文件
解:vim /root/bin/sumfile.sh
#!/bin/bash
first=`ls -l /etc | egrep "(^d.*)|(^-.*)" | wc -l`
second=`ls -l /var | egrep "(^d.*)|(^-.*)" | wc -l`
third=`ls -l /usr | egrep "(^d.*) | (^.*)" | wc -l`
let sum=$[first+second+third]
echo $sum
4、編寫腳本/root/bin/argsnum.sh，接受一個文件路徑作為參數；如果參數個數小於1，則提示用戶“至少應該給一個參數”,並立即退出；如果
參數個數不小於1，則顯示第一個參數所指向的文件中的空白行數
解:vim /root/bin/argsnum.sh
#!/bin/bash
[ "$#" -lt 1 ] && echo "The must one arg" && exit 20
[ -e $1 ] || { echo "No such file or directory" && exit 30; }
[ "$#" -ge 1 ] && echo "The blankspace is `grep "^[[:space:]]*$" $1 | wc -l`"
5、編寫腳本/root/bin/hostping.sh，接受一個主機的IPv4地址做為參數，測試是否可連通。如果能ping通，則提示用戶“該IP地址可訪問”；如
果不可ping通，則提示用戶“該IP地址不可訪問”
解:[[ ! $1 =~ (([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]) ]]
&& echo "please print right ip format!" && exit 20
`ping $1 -c1 &>/dev/null` && echo "Yes" || echo "No"
6、編寫腳本/root/bin/checkdisk.sh，檢查磁盤分區空間和inode使用率，如果超過80%，就發廣播警告空間將滿
解:vim /root/bin/checkdisk.sh
disk=`df -h | grep /dev/sd | tr -s " " % | cut -d % -f5 | sort -nr | head -n1`
inode=`df -i | grep /dev/sd | tr -s " " % | cut -d % -f5 | sort -nr | head -n1`
[ "$disk" -gt 80 ] && echo "The disk is "$disk"% will man" || echo The disk size is "$disk"%
[ "$inode" -gt 5 ] && echo The inode is "$inode"% man || { echo The indoe size is "$inode" && exit 30; }
7、編寫腳本/bin/per.sh,判斷當前用戶對指定的參數文件，是否不可讀並且不可寫
解:vim /bin/per.sh
#!/bin/bash
[ ! -r "$@" ] && [ ! -w "$@" ] && echo The "$@" is Not have w and r permisson or have some one permisson || echo The "$@"
have w and r permission
#另一種寫法
[ ! \( -r "$@" -a -w "$@" \) ] && echo The "$@" is Not have w and r permisson or have some one permisson || echo The "$@"
have w and r permission
8、編寫腳本/root/bin/excute.sh ，判斷參數文件是否為sh後綴的普通文件，如果是，添加所有人可執行權限，否則提示用戶非腳本文件
解:vim /root/bin/excute.sh
[[ "$@" =~ .*\.sh ]] && `chmod a+x "$@" ` || echo The "$@" is not script file
9、編寫腳本/root/bin/nologin.sh和login.sh,實現禁止和充許普通用戶登錄系統
解:vim /root/bin/nologin.sh
#!/bin/bash
touch /etc/nologin
echo "disabled common user login"
vim /root/bin/nologin.sh
#!/bin/bash
rm -rf /etc/nologin
禁止普通用戶登錄時執行第一個腳本,允許登錄後執行第二個腳本
10、編寫腳本/root/bin/agree.sh,提示用戶輸入各種各樣的Yes或No都可以,輸入錯誤的話提示"請輸入正確選項"
解:vim /root/bin/agree.sh
#!/bin/bash
read -p "Do you agree,Plase print Yes or No: " ANS(#變量名)
[[ "$ANS" =~ [Yy]|[Yy][Ee][Ss]|[Nn][Oo]|[Nn] ]] || { echo "please input right options" && exit 20;}
11、讓所有用戶的PATH環境變量的值多出一個路徑，例如：/usr/local/apache/bin
解:vim /etc/profile
PATH=$PATH:$HOME/bin:/usr/local/apache/bin
source /etc/profile
12、用戶root登錄時，將命令指示符變成紅色，並自動啟用如下別名：
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 ’ (如果系統是CentOS7)
解:vim ~/.bashrc
rm='rm –i'
cdnet='cd /etc/sysconfig/network-scripts/'
editnet='vim /etc/sysconfig/network-scripts/ifcfg-ens33'
export PS1='\[\e[1;31m\][\u@\h \W]\$\[\e[0m\]'
source ~/.bashrc
13、任意用戶登錄系統時，顯示紅色字體的警示提醒信息“Hi,dangerous！”
解:vim /etc/profile.d/danger.sh
#!/bin/bash
echo -e "\033[1;5;31mHi,dangerous!\033[0m"
14、編寫生成腳本基本格式的腳本，包括作者，聯系方式，版本，時間，描述等
解:vim /root/bin/createscript.sh
#!/bin/bash
touch $1
chmod +x $1
echo "#/bin/bash
#*************************************
#Filename: $1
#Author: Fang
#Date: `date "+%Y-%m-%d %H:%M:%S"`
#*************************************" > $1
vim + $1
Linux基礎shell腳本題