This subchapter looks at the command separator in UNIX or Linux.
The semicolon ( ; ) is used as a command separator.
You can run more than one command on a single line by using the command separator, plaing the semicolon between each command.
$ date; who am i Mon Aug 27 19:15:41 PDT 2012 admin ttys000 Aug 27 17:50 $
It does not matter if you have a space before the semicolon or not. Use whichever method is more readable and natural for you.
$ date ; who am i Mon Aug 27 19:15:41 PDT 2012 admin ttys000 Aug 27 17:50 $
Each command is processed in order, as if you had typed each individually, with the exception that the line with the prompt is only displayed once, at the end of the series of commands.
If you forget the semicolon, you will get an error message. The following two examples are from different systems.
$ date who am i date: illegal time format $
$ date who am i date: bad conversion $
The semicolon is a common terminator or separator in many common programming languages, including Ada, C, Java, Pascal, Perl, PHP, and PL/I.
Many programmers automatically place the semicolon at the end of any shell command. The shell is fine with this.
$ date; Mon Aug 27 19:15:41 PDT 2012 $
free music player coding example
Coding example: I am making heavily documented and explained open source code for a method to play music for free almost any song, no subscription fees, no download costs, no advertisements, all completely legal. This is done by building a front-end to YouTube (which checks the copyright permissions for you).
Work on this project is very slow because I am homeless. I am available for work if someone can provide an indoor place to work in Costa Mesa, California, electricity, internet connections, a flat raised working surface (such as a table or desk), a sitting device (such as a chair or stool), and a fully functional reasonably modern used computer. Im already homeless, so you dont need to pay me (and I understand how much business people hate the minimum wage law). Just give me a chance to work.
Building a free downloadable text book on computer programming for university, college, community college, and high school classes in computer programming.
If you like the idea of this project, then please donate some money.
send donations to: Milo
PO Box 1361
Tustin, California 92781
At the time I am homeless. This greatly interferes with my ability to create this project, which can help nearly 20 million U.S. college students and more than 150 million students world-wide. I am looking for 30 rich people or corporations willing to donate $10 a month to my church so that the church can provide a place indoors for me to continue work. If you want to donate, please see help project. Thanks much.
Supporting the entire project:
If you have a business or organization that can support the entire cost of this project, please contact Pr Ntr Kmt (my church)
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Names and logos of various OSs are trademarks of their respective owners.