standard error messages

The shell can often be seen: 1>/dev/null 2>&1Eg:sudo kill-9 ' ps-elf |grep-v grep|grep $1|awk ' {print $4} ' 1>/dev/null 2>/dev/nullThe result of the command can be defined in the form of a%> output/dev/null represents an empty device fileWhere does

the shell can often be seen: >/dev/null 2>&1 Eg:sudo kill-9 ' ps-elf |grep-v grep|grep $1|awk ' {print $4} ' 1>/dev/null 2>/dev/nullThe result of the command can be defined in the form of a%> output/dev/null represents an empty device fileWhere

Http://www.cnblogs.com/songdavid/articles/2067534.htmlWhen calling the EBS standard API, it may be possible to return some incomprehensible errors, such as when I recently developed rcv_transaction_interface, the data card is not in the interface

If you're a veteran of PHP, you know what happens when a php script goes wrong. The PHP parser then gives the error message on the screen, such as Fatal error:call to undefined function in line 19--so the program terminates here. This information

Source: qq ForumThe information in this article applies:Microsoft Data Access Components versions 1.5, 2.0, 2.1, 2.5Active Server PagesMicrosoft Visual InterDev and version 1.0--------------------------------------------------------------------------

On the topic "sending and receiving short messages via serial port", I will organize some technical questions I have discussed with netizens into the following text. I hope this article will help more friends who are interested in SMS. Because I am

Operating systems typically have three standard file descriptors: standard input, standard output, standard errorThis is an abstract expression of the operating systemDifferent languages need to have different specific expressions, and of course

I. INTRODUCTIONIn Web applications, you often need to display a notification message (also called a "flash message") to the user after processing the form or other type of user inputFor this feature, Django provides cookies and session-based

From: http://blog.csdn.net/gztoby/archive/2004/09/21/112041.aspx I learned a lot after reading it. Introduction Young people who have never sent text messages must belong to a protected rare animal. Today's well-developed text messages have

Sometimes I want to get the output of a Write statement when writing some shell scripts. For example, when I use javac to compile a java class, I want to know whether the compilation is successful, it is easy to think of to judge based on the javac