指令碼練習 計畫任務管理

#!/bin/bash

read -p "please input a filename:" file
if [ ! -e $file ];then
echo "file is not exits"
elif [ ! -r $file -a ! -w $file ];then
echo "$user can't read and write $file"
else
echo "$file can read or write"
fi

[root@centos7 testdata]# chmod +x per.sh

[root@centos7 testdata]# ./per.sh
please input a filename:/etc/shadow
/etc/shadow can read or write
[root@centos7 testdata]# su cwj
[cwj@centos7 testdata]$ ./per.sh
please input a filename:/etc/shadow
cwj can't read and write /etc/shadow

#!/bin/bash

read -p "please input a file:" file
if [ -e $file ];then
if [ -f $file ];then
suffix=`echo "$file" | awk -f. ''`
if [ $suffix == "sh" ];then
chmod a+x $file
echo "$file change mode success"
else
echo "$file is not script file"
fielse
echo "file is not a normal file"
fielse
echo "file is not exits"
fi

[root@centos7 testdata]# ./excute.sh 

please input a file:scp1.exp
scp1.exp is not script file
[root@centos7 testdata]# ./excute.sh 
please input a file:per.sh
per.sh change mode success

#!/bin/bash

read -p "please input user name:" name
id $name >/dev/null
if [ $? -eq 0 ];then
userid=`id $name |sed -r 's/.*=([0-9]+).*/\1/'`
if [ $userid -ge 500 ];then
usermod -s /sbin/nologin $name
echo "usermod success"
else
echo "$name is a system user"
fielse 
echo "$name is not exits"
fi

please input user name:cwj

usermod success
[root@centos7 testdata]# ./nologin.sh
please input user name:root
root is a system user
[root@centos7 testdata]# getent passwd cwj
cwj:x:1000:1000:cwj:/home/cwj:/sbin/nologin

#!/bin/bash

read -p "please input user name:" name
id $name >/dev/null
if [ $? -eq 0 ];then
userid=`id $name |sed -r 's/.*=([0-9]+).*/\1/'`
if [ $userid -ge 500 ];then
usermod -s /bin/bash $name
echo "usermod success"
else
echo "$name is a system user"
fielse 
echo "$name is not exits"
fi

[root@centos7 testdata]# chmod +x login.sh 

[root@centos7 testdata]# ./login.sh 
please input user name:cwj
usermod success
[root@centos7 testdata]# ./login.sh 
please input user name:root
root is a system user
[root@centos7 testdata]# getent passwd cwj
cwj:x:1000:1000:cwj:/home/cwj:/bin/bash

#! /bin/bash

user10="`head -n $2 $1 | tail -n 1|cut -d: -f3`"
user20="`head -n $3 $1 | tail -n 1|cut -d: -f3`"
let sum=$user10+$user20
echo "user id sum is $sum"

使用iostat，可以非常詳細的檢視到是哪塊硬碟最繁忙,iostate 預設不安裝在系統中，需要使用yum安裝： yum install iostat

編寫backup指令碼

#!/bin/bash

cp /etc/passwd /home/cwj/testdata/passwd.bak`date +%f-%t`

0 6-12/3 * 12 * /home/cwj/testdata/backup

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