第八周作業

M36-Masuri ? 2017-07-03 21:13 ? Linux干貨

1、寫一個腳本，使用ping命令探測172.16.250.1-172.16.250.254之間的所有主機的在線狀態；
在線的主機使用綠色顯示；
不在線的主使用紅色顯示；

#!/bin/bash
for i in {1..254};do
        if ping -c 1 -w 1 192.168.1.$i &> /dev/null;then
                echo -e "\033[32m192.168.1.$i\033[0m is up"
        else
                echo -e "\033[31m192.168.1.$i\033[0m is down"
        fi
done

2、如何給網絡接口配置多個地址，有哪些

1.使用ifcfg工具來配置

[root@localhost ~]# ifconfig                                                       #先查看下本地網絡接口，以ens36為例進行配置多個地址
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.22  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::e4e8:fedc:3ce4:f467  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:ca:aa:a0  txqueuelen 1000  (Ethernet)
        RX packets 258664  bytes 16503651 (15.7 MiB)
        RX errors 0  dropped 41  overruns 0  frame 0
        TX packets 21160  bytes 2557022 (2.4 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens36: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.25  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::e9d2:3bcd:cc12:fcd6  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:ca:aa:aa  txqueuelen 1000  (Ethernet)
        RX packets 128498  bytes 8532781 (8.1 MiB)
        RX errors 0  dropped 7653  overruns 0  frame 0
        TX packets 17151  bytes 2660221 (2.5 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1  (Local Loopback)
        RX packets 210  bytes 18936 (18.4 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 210  bytes 18936 (18.4 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
        ether 52:54:00:ee:0e:1c  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root@localhost ~]# ifconfig  ens36:0 192.168.1.101/24                              #ifconfig進行配置多地址時需要在接口號后面加上:#來進行配置多個地址
[root@localhost ~]# ifconfig                                                        #再次查看本地網絡接口時出現一個名為ens36:0的接口號，這個為ens36的第2個網絡地址
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.22  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::e4e8:fedc:3ce4:f467  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:ca:aa:a0  txqueuelen 1000  (Ethernet)
        RX packets 259063  bytes 16528702 (15.7 MiB)
        RX errors 0  dropped 41  overruns 0  frame 0
        TX packets 21174  bytes 2558222 (2.4 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens36: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.25  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::e9d2:3bcd:cc12:fcd6  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:ca:aa:aa  txqueuelen 1000  (Ethernet)
        RX packets 129198  bytes 8583799 (8.1 MiB)
        RX errors 0  dropped 7653  overruns 0  frame 0
        TX packets 17375  bytes 2687139 (2.5 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens36:0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.101  netmask 255.255.255.0  broadcast 192.168.1.255
        ether 00:0c:29:ca:aa:aa  txqueuelen 1000  (Ethernet)

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1  (Local Loopback)
        RX packets 210  bytes 18936 (18.4 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 210  bytes 18936 (18.4 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
        ether 52:54:00:ee:0e:1c  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

2.使用ip命令進行配置

[root@localhost ~]# ip addr list                                                                          #使用ip addr list來查看本地接口配置，依舊以ens36為例進行配置
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:ca:aa:a0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.22/24 brd 192.168.1.255 scope global dynamic ens33
       valid_lft 85503sec preferred_lft 85503sec
    inet6 fe80::e4e8:fedc:3ce4:f467/64 scope link 
       valid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN qlen 1000
    link/ether 52:54:00:ee:0e:1c brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN qlen 1000
    link/ether 52:54:00:ee:0e:1c brd ff:ff:ff:ff:ff:ff
5: ens36: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:ca:aa:aa brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.25/24 brd 192.168.1.255 scope global dynamic ens36
       valid_lft 55915sec preferred_lft 55915sec
    inet 192.168.1.101/24 brd 192.168.1.255 scope global secondary ens36:0                            #此為剛才ifconfig命令配置的地址
       valid_lft forever preferred_lft forever
    inet6 fe80::e9d2:3bcd:cc12:fcd6/64 scope link 
       valid_lft forever preferred_lft forever

[root@localhost ~]# ip addr add 192.168.1.102/24 dev ens36                                             #使用 ip addr add命令為ens36添加地址為192.168.1.102/24的地址
[root@localhost ~]# ip addr lis                                                                        #配置完畢再次查看接口
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:ca:aa:a0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.22/24 brd 192.168.1.255 scope global dynamic ens33
       valid_lft 85418sec preferred_lft 85418sec
    inet6 fe80::e4e8:fedc:3ce4:f467/64 scope link 
       valid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN qlen 1000
    link/ether 52:54:00:ee:0e:1c brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN qlen 1000
    link/ether 52:54:00:ee:0e:1c brd ff:ff:ff:ff:ff:ff
5: ens36: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:ca:aa:aa brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.25/24 brd 192.168.1.255 scope global dynamic ens36
       valid_lft 55830sec preferred_lft 55830sec
    inet 192.168.1.101/24 brd 192.168.1.255 scope global secondary ens36:0
       valid_lft forever preferred_lft forever
    inet 192.168.1.102/24 scope global secondary ens36                                               #此為是用ip命令為此接口配置的第3條地址
       valid_lft forever preferred_lft forever
    inet6 fe80::e9d2:3bcd:cc12:fcd6/64 scope link 
       valid_lft forever preferred_lft forever

注意：以上2條命令為通過命令直接送至內核當場有效，重啟后無效，若要永久有效需通過修改配置文件來實現。

3.通過修改配置文件進行配置

網絡配置的配置文件在/etc/sysconfig/network-scripts/下以ifcfg-IFACE名明的文件。

[root@localhost ~]# cd /etc/sysconfig/network-scripts/
[root@localhost network-scripts]# ls                                                                                           #此處任然以ifcfg-ens36為例，由于是命令行配置的地址所以沒有配置文件需要手動去創建配置文件
ifcfg-ens33  ifdown-ippp    ifdown-sit       ifup-bnep  ifup-plip    ifup-Team          network-functions-ipv6
ifcfg-lo     ifdown-ipv6    ifdown-Team      ifup-eth   ifup-plusb   ifup-TeamPort
ifdown       ifdown-isdn    ifdown-TeamPort  ifup-ib    ifup-post    ifup-tunnel
ifdown-bnep  ifdown-post    ifdown-tunnel    ifup-ippp  ifup-ppp     ifup-wireless
ifdown-eth   ifdown-ppp     ifup             ifup-ipv6  ifup-routes  init.ipv6-global
ifdown-ib    ifdown-routes  ifup-aliases     ifup-isdn  ifup-sit     network-functions

[root@localhost network-scripts]# cp ifcfg-ens33 ifcfg-ens36                                                                  #復制ens33的配置文件命名為ens36然后進行手動配置
[root@localhost network-scripts]# ls
ifcfg-ens33  ifdown-ib    ifdown-routes    ifup-aliases  ifup-isdn    ifup-sit          network-functions
ifcfg-ens36  ifdown-ippp  ifdown-sit       ifup-bnep     ifup-plip    ifup-Team         network-functions-ipv6
ifcfg-lo     ifdown-ipv6  ifdown-Team      ifup-eth      ifup-plusb   ifup-TeamPort
ifdown       ifdown-isdn  ifdown-TeamPort  ifup-ib       ifup-post    ifup-tunnel
ifdown-bnep  ifdown-post  ifdown-tunnel    ifup-ippp     ifup-ppp     ifup-wireless
ifdown-eth   ifdown-ppp   ifup             ifup-ipv6     ifup-routes  init.ipv6-global

使用vim編輯ifcfg-ens36這個文件

TYPE="Ethernet"
BOOTPROTO="static"
IPADDR="192.168.2.100"
NETMASK="255.255.255.0"
GATEWAY="192.168.2.1"
NAME="ens36"
DEVICE="ens36"
ONBOOT="yes"
~

配置完成后保存退出，由于是通過配置文件進行修改，此時需要重啟網絡服務

[root@localhost network-scripts]# systemctl restart network                          #重啟網絡服務
[root@localhost network-scripts]# ifconfig                                           #再次查看網絡接口
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.22  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::e4e8:fedc:3ce4:f467  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:ca:aa:a0  txqueuelen 1000  (Ethernet)
        RX packets 268920  bytes 17141298 (16.3 MiB)
        RX errors 0  dropped 42  overruns 0  frame 0
        TX packets 21373  bytes 2579314 (2.4 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens36: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.2.100  netmask 255.255.255.0  broadcast 192.168.2.255          #此時接口地址已經變為配置文件所修改的內容
        inet6 fe80::20c:29ff:feca:aaaa  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:ca:aa:aa  txqueuelen 1000  (Ethernet)
        RX packets 140651  bytes 9339322 (8.9 MiB)
        RX errors 0  dropped 7666  overruns 0  frame 0
        TX packets 19594  bytes 2914428 (2.7 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1  (Local Loopback)
        RX packets 262  bytes 23376 (22.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 262  bytes 23376 (22.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
        ether 52:54:00:ee:0e:1c  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

再此需要對此接口進行配置網絡地址時，需要復制原配置文件并把配置文件名字改為原名字后加上:#的格式，然后使用vim對配置文件內容進行修改

[root@localhost network-scripts]# cp ifcfg-ens36 ifcfg-ens36:0                     #復制原文件改名
[root@localhost network-scripts]# vim ifcfg-ens36:0                                #編輯此配置文件

TYPE="Ethernet"
BOOTPROTO="static"
IPADDR="192.168.2.105"
NETMASK="255.255.255.0"
GATEWAY="192.168.2.1"
NAME="ens36:0"
DEVICE="ens36:0"
ONBOOT="yes"
~

[root@localhost network-scripts]# systemctl restart network                          #重啟網絡服務
[root@localhost network-scripts]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.22  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::e4e8:fedc:3ce4:f467  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:ca:aa:a0  txqueuelen 1000  (Ethernet)
        RX packets 269861  bytes 17214441 (16.4 MiB)
        RX errors 0  dropped 42  overruns 0  frame 0
        TX packets 21709  bytes 2627749 (2.5 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens36: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.2.100  netmask 255.255.255.0  broadcast 192.168.2.255
        inet6 fe80::20c:29ff:feca:aaaa  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:ca:aa:aa  txqueuelen 1000  (Ethernet)
        RX packets 141164  bytes 9373345 (8.9 MiB)
        RX errors 0  dropped 7821  overruns 0  frame 0
        TX packets 19629  bytes 2919336 (2.7 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens36:0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500                    #此時出現了ens36接口上的第二個網絡地址
        inet 192.168.2.105  netmask 255.255.255.0  broadcast 192.168.2.255
        ether 00:0c:29:ca:aa:aa  txqueuelen 1000  (Ethernet)

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1  (Local Loopback)
        RX packets 298  bytes 26456 (25.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 298  bytes 26456 (25.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
        ether 52:54:00:ee:0e:1c  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

4.使用nmcli命令添加地址

[root@localhost network-scripts]# nmcli conn modify ens36 +ipv4.address 192.168.2.201/24        #為ens36顯卡添加新地址
[root@localhost network-scripts]# systemctl restart network                                     #重啟網路服務
[root@localhost network-scripts]# nmcli dev show ens36
GENERAL.設備:                           ens36
GENERAL.類型:                           ethernet
GENERAL.硬盤:                           00:0C:29:CA:AA:AA
GENERAL.MTU:                            1500
GENERAL.狀態:                           100 (連接的)
GENERAL.CONNECTION:                     ens36
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/31
WIRED-PROPERTIES.容器:                  開
IP4.地址[1]:                            192.168.2.100/24
IP4.地址[2]:                            192.168.2.201/24                                       #此處為新添加的網絡地址
IP4.地址[3]:                            192.168.2.105/24
IP4.網關:                               192.168.2.1
IP6.地址[1]:                            fe80::20c:29ff:feca:aaaa/64
IP6.網關:

5.使用nmtui進行配置

第八周作業

完成配置后保存退出

3、寫一個腳本，完成以下功能
(1) 假設某目錄(/etc/rc.d/rc3.d/)下分別有K開頭的文件和S開頭的文件若干；
(2) 顯示所有以K開頭的文件的文件名，并且給其附加一個stop字符串；
(3) 顯示所有以S開頭的文件的文件名，并且給其附加一個start字符串；
(4) 分別統計S開頭和K開頭的文件各有多少；

#!/bin/bash
declare -i n=0;
declare -i m=0;
for FILE in `ls /etc/rc.d/rc3.d`;do
        if [[ $FILE =~ ^K ]];then
                echo "$FILE stop"
                let n=$n+1
        elif [[ $FILE =~ ^S ]];then
                echo "$FILE start"
                let m=$m+1
        fi
done
echo "First char is S = $m , First char is K = $n"

4、寫一個腳本，完成以下功能
(1) 腳本能接受用戶名作為參數；
(2) 計算此些用戶的ID之和；

#!/bin/bash
declare -i SUM=0
for i in $@;do
        if ! id $i &> /dev/null ; then
                echo "$i is not exists"
        else
                let SUM=$SUM+$(id -u $i);
        fi
done
echo "uid sum = $SUM"

5、寫一個腳本
(1) 傳遞一些目錄給此腳本；
(2) 逐個顯示每個目錄的所有一級文件或子目錄的內容類型；
(3) 統計一共有多少個目錄；且一共顯示了多少個文件的內容類型；

#!/bin/bash
declare -i dir=0
declare -i filetype=0
for i in $@;do
        if [ -d $i ];then
                for j in $i/*;do
                        file $j &> /dev/null
                        let filetype=$filetype+1
                        if [ -d $j ];then
                                let dir=$dir+1
                        fi

                done
        else
                echo "$i is not a dirfile or not exists"
        fi
done
echo " dir = $dir ,all file = $filetype

6、寫一個腳本
通過命令行傳遞一個參數給腳本，參數為用戶名
如果用戶的id號大于等于500，則顯示此用戶為普通用戶

#!/bin/bash
read -p "please send a username:" UNAME
if id $UNAME &> /dev/null ;then
        if [ $(id -u $UNAME) -gt 500 ];then
                echo "this is a normal user"
        fi
else
        echo "no this user"
fi

7、寫一腳本，用ping命令測試172.16.250.20-172.16.250.100以內有哪些主機在線，將在線的顯示出來；

#!/bin/bash
for i in {20..100};do
        if ping -c 1 -w 1 172.16.250.$i &> /dev/null;then
                echo "172.16.250.$i online"
        fi
done

8、打印九九乘法表；

#!/bin/bash
for i in {1..9};do
        for j in `seq $i`;do
                let num=$j*$i
                echo -n -e "$j*$i=$num\t"
        done
        echo
done

原創文章，作者：M36-Masuri，如若轉載，請注明出處：http://www.www58058.com/79365

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Linux干貨 2017-04-23
硬鏈接與軟鏈接

引言：鏈接，一種在共享文件和訪問它的用戶的若干目錄項之間建立聯系的一種方法。 Linux中包括兩種鏈接：硬鏈接(Hard Link)和軟鏈接(Soft Link)，軟鏈接又稱為符號鏈接（Symbolic link）。 Inode譯成中文就是索引節點，它用來存放檔案及目錄的基本信息，包含時間、檔名、使用者及群組等。 Block：存放檔案內容數據的地方。 &n…

Linux干貨 2016-10-20
馬哥教育網絡班22期+第1周課程練習

問題1：計算機組成如下：CPU、存儲器、輸入設備、輸出設備1、中央處理器（Central Processing Unit，簡稱 CPU）。它主要由控制器、運算器等組成，并采用大規模集成電路工藝制成的芯片，又稱微處理器芯片。 CPU又由運算器和控制器組成。1）運算器運算器又稱算術邏輯單元（Arithmetic Logic Unit簡…

Linux干貨 2016-08-15
Linux干貨

sed編輯器使用

簡述 sed編輯器被稱作流編輯器，和普通的交互式文本編輯器恰好相反。在交互式文本編輯器中（比如vim），你可以用鍵盤命令來交互式地插入、刪除或替換數據中的文本。流編輯器則會在編輯器處理數據之前基于預先提供的一組規則來編輯數據流。sed編輯器可以根據命令來處理數據流中的數據，這些命令…

2017-06-19
Linux基本操作：關機重啟

Linux系統安裝完成以后，就要學會一些Linux的基本操作命令，首先是關機和重啟命令，如果進入Linux系統之后連關機重啟都不會是不是太不應該了，總不能關機或重啟的時候直接關閉電源在開機吧，這就顯得太不專業了，這樣也會對Linux系統主機不太好，一些進程還沒有關閉就直接斷電，會導致Linux系統的不穩定出現問題，何況也…

Linux干貨 2016-08-04

欧美性久久久久