1落包、編寫腳本實(shí)現(xiàn)登陸遠(yuǎn)程主機(jī)俊啼。（使用expect和shell腳本兩種形式）策幼。

1. expect

#!/usr/bin/expect
set ip [lindex $argv 0]
set user [lindex $argv 1]
set password [lindex $argv 2]
spawn ssh $user@$ip
expect {
        "yes/no" { send "yes\n";exp_continue }
        "password" { send "$password\n" }
}
interact

expect

2. shell

#!/bin/bash
ip=$1
user=$2
password=$3
expect <<EOF
set timeout 20
spawn ssh $user@$ip
expect {
        "yes/no" { send "yes\n";exp_continue }
        "password" { send "$password\n"}
}
expect eof
EOF

2、生成10個隨機(jī)數(shù)保存于數(shù)組中奴紧，并找出其最大值和最小值

#!/bin/bash
for i in {1..10}; do
    number[$i]=`echo $RANDOM`
done
min=${number[1]}
max=${number[1]}
for j in ${number[*]}; do
     [ $j -gt $max ] && max=$j && continue
     [ $j -lt $min ] && min=$j
done
echo "numbers are ${number[*]}"
echo "minimum is $min, maximum is $max"

結(jié)果

3特姐、輸入若干個數(shù)值存入數(shù)組中，采用冒泡算法進(jìn)行升序或降序排序

#!/bin/bash
for i in `eval echo {1..$1}`; do
        (( $1 > 1 )) && number[$i]=`echo $RANDOM`
done
echo ${number[*]}

for (( i=0;i<$1;i++ ));do
        for (( j=0;j<$1-$i;j++ )); do
                if [[ ${number[j]} -gt ${number[$((j+1))]} ]];then
                temp=${number[j]}
                number[j]=${number[$((j+1))]}
                number[$((j+1))]=$temp
        fi
done
done
echo ${number[*]}

升序

#!/bin/bash
for i in `eval echo {1..$1}`; do
        (( $1 > 1 )) && number[$i]=`echo $RANDOM`
done
echo ${number[*]}

for (( i=0;i<$1;i++ ));do
        for (( j=0;j<$1-$i;j++ )); do
                if [[ ${number[j]} -lt ${number[$((j+1))]} ]];then
                temp=${number[j]}
                number[j]=${number[$((j+1))]}
                number[$((j+1))]=$temp
        fi
done
done
echo ${number[*]}

降序

4黍氮、總結(jié)查看系統(tǒng)負(fù)載的幾種命令唐含，總結(jié)top命令的指標(biāo)大概什么含義(不要求全部寫出來)

1. CPU
   • top或htop
   • vmstat
   • pidstat
2. 內(nèi)存
   • free
   • sar
   • ps
3. 磁盤或文件系統(tǒng)
   • iostat
   • df
   • lsof
4. 網(wǎng)絡(luò)
   • iftop
   • iptraf-ng
   • ss

top命令

top

5飒箭、編寫腳本，使用for和while分別實(shí)現(xiàn)192.168.0.0/24網(wǎng)段內(nèi)，地址是否能夠ping通弦蹂，若ping通則輸出"success!"肩碟，若ping不通則輸出"fail!"

#!/bin/bash
for (( i=1;i<255;i++ ));do
        {
 ping -c 1 -W 1 192.168.0.$i &> /dev/null && echo "192.168.0.$i success!" || echo "192.168.0.$i fail!"
        }&
         done
         wait

for

6、每周的工作日1:30凸椿，將/etc備份至/backup目錄中削祈，保存的文件名稱格式 為“etcbak-yyyy-mm-dd-HH.tar.xz”，其中日期是前一天的時間

6.sh

#!/bin/bash
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin
date=`date -d "yesterday" +%Y-%m-%d-%H`
tar -cJf /backup/etcback-$date.tar.xz /etc