【CentOS 7Shell編程1】，shell腳本結構和執行方法/date命令的用法#180205

hellopasswd

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shell腳本結構和執行方法

• 開頭須要加#!/bin/bash
• 以#開頭的行做爲解釋說明
• 腳本的名字以.sh結尾，用於區分這是一個shell腳本
• 執行方法有兩種
• chmod +x 1.sh; ./1.sh
• bash 1.sh
• 查看腳本執行過程bash -x 1.sh
• 查看腳本是否語法錯誤bash -n 1.sh

[root@localhost ~]# mkdir shell
[root@localhost ~]# cd shell/
[root@localhost shell]# vi 1.sh
添加
      1 #!/bin/bash
      2 echo "1"
      3 w
      4 ls

執行腳本方式

[root@localhost shell]# sh 1.sh
[root@localhost shell]# sh 1.sh 
	1
	 04:37:40 up 17:50,  2 users,  load average: 0.00, 0.01, 0.05
	USER     TTY        LOGIN@   IDLE   JCPU   PCPU WHAT
	root     tty1      Fri10   16:41m  1.01s  1.01s -bash
	root     pts/1     04:24    4.00s  0.04s  0.00s /bin/bash ./1.sh
	1.sh

[root@localhost shell]# chmod a+x 1.sh
[root@localhost shell]# ./1.sh
	1
	 04:41:23 up 17:54,  2 users,  load average: 0.00, 0.01, 0.05
	USER     TTY        LOGIN@   IDLE   JCPU   PCPU WHAT
	root     tty1      Fri10   16:44m  1.01s  1.01s -bash
	root     pts/1     04:24    3.00s  0.08s  0.00s /bin/bash ./1.sh
	1.sh

[root@localhost shell]# sh -x 1.sh 
	+ echo 1
	1
	+ w
	 04:44:30 up 17:57,  2 users,  load average: 0.00, 0.01, 0.05
	USER     TTY        LOGIN@   IDLE   JCPU   PCPU WHAT
	root     tty1      Fri10   16:47m  1.01s  1.01s -bash
	root     pts/1     04:24    6.00s  0.13s  0.02s w
	+ ls
	1.sh

每個+表示執行的過程

判斷語法是否存在錯誤

[root@localhost shell]# sh -n 1.sh

date命令的用法

• date +%Y-%m-%d,date +%y-%m-%d 年月日
• date +%H:%M:%S = date +%T 時間
• date +%s 時間戳
• date -d @1504620492
• date -d "-1 day" 一天後
• date -d "+1 day" 一天前
• date -d 」-1 month" 一月前
• date -d "-d min" 一分前
• date +%w,date +%W 星期

[root@localhost ~]# date
	Sat Feb  3 06:25:06 EST 2018
[root@localhost ~]# date +%Y
	2018
[root@localhost ~]# date +%m
	02
[root@localhost ~]# date +%d
	03

[root@localhost ~]# date +%Y-%m-%d
	2018-02-03
[root@localhost ~]# date +%y-%m-%d
	18-02-03
[root@localhost ~]# date +%F
	2018-02-03

• 當前時間

[root@localhost ~]# date +%F
2018-07-17

• 當前日期

[root@localhost ~]# date +%T
05:30:29

[root[@localhost](https://my.oschina.net/u/570656) ~]# date +%H:%M:%S
	06:31:15
[root[@localhost](https://my.oschina.net/u/570656) ~]# date +%T
	06:31:30

[root@localhost ~]# date -d "-1 day" +%y%m%d
	180202
[root@localhost ~]# date -d "+1 day" +%y%m%d
	180204
[root@localhost ~]# date -d "-1 month" +%y%m%d
	180103
[root@localhost ~]# date -d "-1 min" +%H%M%S
	062741

years、month、day、hour、min、

[root@localhost ~]# date +%w
	6
[root@localhost ~]# date +%W
	05

[root@localhost ~]# cal
    February 2018   
Su Mo Tu We Th Fr Sa
             1  2  3
 4  5  6  7  8  9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28
[root@localhost ~]# cal 2018
                               2018                               

       January               February                 March       
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
    1  2  3  4  5  6                1  2  3                1  2  3
 7  8  9 10 11 12 13    4  5  6  7  8  9 10    4  5  6  7  8  9 10
14 15 16 17 18 19 20   11 12 13 14 15 16 17   11 12 13 14 15 16 17
21 22 23 24 25 26 27   18 19 20 21 22 23 24   18 19 20 21 22 23 24
28 29 30 31            25 26 27 28            25 26 27 28 29 30 31

        April                   May                   June        
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
 1  2  3  4  5  6  7          1  2  3  4  5                   1  2
 8  9 10 11 12 13 14    6  7  8  9 10 11 12    3  4  5  6  7  8  9
15 16 17 18 19 20 21   13 14 15 16 17 18 19   10 11 12 13 14 15 16
22 23 24 25 26 27 28   20 21 22 23 24 25 26   17 18 19 20 21 22 23
29 30                  27 28 29 30 31         24 25 26 27 28 29 30

        July                  August                September     
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
 1  2  3  4  5  6  7             1  2  3  4                      1
 8  9 10 11 12 13 14    5  6  7  8  9 10 11    2  3  4  5  6  7  8
15 16 17 18 19 20 21   12 13 14 15 16 17 18    9 10 11 12 13 14 15
22 23 24 25 26 27 28   19 20 21 22 23 24 25   16 17 18 19 20 21 22
29 30 31               26 27 28 29 30 31      23 24 25 26 27 28 29
                                              30
       October               November               December      
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
    1  2  3  4  5  6                1  2  3                      1
 7  8  9 10 11 12 13    4  5  6  7  8  9 10    2  3  4  5  6  7  8
14 15 16 17 18 19 20   11 12 13 14 15 16 17    9 10 11 12 13 14 15
21 22 23 24 25 26 27   18 19 20 21 22 23 24   16 17 18 19 20 21 22
28 29 30 31            25 26 27 28 29 30      23 24 25 26 27 28 29
                                              30 31

[root@localhost ~]# date +%s
1517661538

[root@localhost ~]# date -d @1517661538
Sat Feb  3 07:38:58 EST 2018
[root@localhost ~]# date +%s -d "2018-02-03 07:38:58"
1517661538

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修改於 180205