Published Book on Amazon
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All of IOT Starting with the Latest Raspberry Pi from Beginner to Advanced – Volume 1 |
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All of IOT Starting with the Latest Raspberry Pi from Beginner to Advanced – Volume 2 |
출판된 한글판 도서
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최신 라즈베리파이(Raspberry Pi)로 시작하는 사물인터넷(IOT)의 모든 것 – 초보에서 고급까지 (상) |
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최신 라즈베리파이(Raspberry Pi)로 시작하는 사물인터넷(IOT)의 모든 것 – 초보에서 고급까지 (하) |
Original Book Contents
10.7.2 ";" Command - Execute Multiple Commands Successively
Linux provides a way to enter and process all the commands at once, if you have multiple commands to process. To execute several commands at once in this way, link each command with the ";" command as follows.
[Command Format]
| exec-command ; exec-command |
[Command Overview]
■ This executes several commands at once successively with this command.
■ User privilege -- Normal user.
[Detail Description]
■ If you enter multiple commands in this way, the command will be executed one by one from the beginning. As the commands are sequentially executed, the execution results of the commands are also sequentially displayed on the screen.
[Used Example]
First, let's start by executing the following commands one by one sequentially.
| pi@raspberrypi ~ $ cd testdata |
| pi@raspberrypi ~/testdata $ ls -l |
| total 24 -rw-r--r-- 1 pi pi 62 Apr 23 22:06 customer_list.txt -rw-r--r-- 1 pi pi 123 Apr 23 22:00 customer_product.txt drwxr-xr-x 4 pi pi 4096 Apr 25 16:56 TestFolder01 drwxr-xr-x 2 pi pi 4096 Apr 10 22:32 TestFolder02 drwxr-xr-x 2 pi pi 4096 Apr 25 17:11 TestFolder03 -rw-rw---- 1 pi pi 113 Apr 23 17:22 user_guide01.txt |
| pi@raspberrypi ~/testdata $ cat customer_list.txt |
| Microsoft IBM LG Samsung Sony Hewlett-Packard |
The above command moves to the "testdata" directory, checks what data is in the directory, and checks the contents of the "customer_list.txt" file in that directory.
Then, this time, we will enter all of the commands executed above at the same time and execute them at once.
| pi@raspberrypi ~ $ cd testdata ; ls -l ; cat customer_list.txt |
| total 24 -rw-r--r-- 1 pi pi 62 Apr 23 22:06 customer_list.txt -rw-r--r-- 1 pi pi 123 Apr 23 22:00 customer_product.txt drwxr-xr-x 4 pi pi 4096 Apr 25 16:56 TestFolder01 drwxr-xr-x 2 pi pi 4096 Apr 10 22:32 TestFolder02 drwxr-xr-x 2 pi pi 4096 Apr 25 17:11 TestFolder03 -rw-rw---- 1 pi pi 113 Apr 23 17:22 user_guide01.txt Microsoft IBM LG Samsung Sony Hewlett-Packard |
If you check the above, it can be seen that the displayed result while the respective commands are executed is displayed sequentially without a special seperator.