unix sudo command example

using Linux/unix next. Often use the text interface to set up the system or the operating system, the author is in command of this aspect of the process of continuous contact. Therefore, in order toThis special brewing, preparation, began the writing of this article. This paper mainly records some of their usual linux/unix under the operation of commands, records

One of people's dissatisfaction with shell commands in UNIX systems is that their form does not always prompt their functions. For example, to identify the grep function of Unix commands, you can only learn about them in advance, or depending on people's ingenuity and familiarity with the Unix editor ed. The literal fo

The Find command is a powerful tool in the UNIX operating system. In addition to being able to locate files, there are many other useful uses for this command. If you can use it to back up files, delete files interactively, enumerate file lists, and so on. As long as the flexible application of these features, then the day-to-day work of system engineers can play

Our traditional method of writing programs is to create a single and fully functional program and try to provide functions that can fully meet the needs in a program. Such an approach will cause huge and complex programs, reduced maintainability. Generally, programs on windows have comprehensive functions and do not need to work with other programs. For example, if two programs require paging, they will develop a paging module, instead of seeking for

Grep command series: how to find files based on the file content in UNIX To complete the course assignments, I wrote a lot of C-language code and saved them as/home/user/c/*. c and *. h. In the UNIX shell window, how can I find a file through a string or word (for example, the function name main? You need to use the f

input and the edit can be done in input mode. For example, to deleteIn addition to the characters, press [Delete] directly. The insert state and the substitution state can be cut directly with [insert]The editing instructions for the instruction mode. But as mentioned earlier, these instructions are almost everyTerminals can be used, not just on the PC.The basic instructions for moving a cursor in instruction mode are H, J, K, L. I think you should b

under the use of Linux/unix, often use the text interface to set up the system or operating system, the author himself in the process of work is also constantly in touch with this command, so forThis special brewing, preparation, began the writing of this article. This paper mainly records some of their usual linux/unix under the operation of

As a widely used debugger under Unix/linux, GDB not only provides rich commands, but also introduces scripting support: one for existing scripting language support, such as Python, where users can write Python scripts directly, and GDB calls the Python interpreter to execute The other is a command script, in which the user can write GDB commands that GDB has provided or customize, and then run by GDB. In th

Write Cache command--sync After starting the UNIX system with the reboot command, the system prompts for an error message and some applications do not work properly. After careful examination of system files, and the initial correct backup to compare, found that some files are indeed corrupted, toss and turn to find the cause of the file is destroyed, and fina

As you know, it is sometimes necessary to terminate all Oracle processes or a specified set of Oracle processes. When the database is "locked" and you cannot enter Server Manager to "gently" Terminate the database, you can use the kill command in UNIX to terminate all Oracle processes-this is one of the common uses of the kill command.To terminate an Oracle instance on a

also be obtained outside the shell. For example, there are two commands: Lastcomm (from the Acct package in Ubuntu main repositories) and Auditctl (AUDITD package from the Ubuntu Universe Software warehouse). In addition, Linux Journal published a Good article on the Linux process statistics in 2002. There are also two packages, rootsh and Snoopylogger, except that both are not in the Ubuntu software repository. Rootsh is like a typescript version, a

A Unix operating system may paralyze the system after a sudden power failure. At this point, the Unix operating system is not as good as that of Microsoft. If a power failure occurs, the Windows operating system will automatically detect and restore the system when it is restarted, but Unix won't... A Unix operating sy

The Iconv command is a file-encoded reload tool that runs on the Linux/unix platform. When we look at the text file in the Linux/unix system shell, we often find that the file is garbled in Chinese, this is due to the encoding of the text file and the current operating system settings, which can be encoded by using the ICONV conversion, to solve the garbled probl

That day to write a script, you need to turn the hexadecimal number into a decimal, found do not know how to do, search, the original is very simple, than with C language or something easier, on some ready-made orders to solve.Two simple methods are listed first:1) Echo can achieve it by itself, quite simply. However, you do not know what to write if you want to convert from decimal to hexadecimal.]$ echo $ ((0XAC))1722) printf can also oh, hexadecimal and decimal conversions are fine.]$ printf%

About LNLn creates links between files.DescriptionLN creates a link to file TARGET with the name linkname. If linkname is omitted, a link to TARGET was created in the current directory, using the name of the Targ ET as the linkname.Ln creates hard links by default, or symbolic links if the- s (--symbolic) option is Specifie D. When creating hard links, each TARGET must exist.What is A Link?Before we discuss the ln command, let's first discuss the link

A Unix operating system may paralyze the system after a sudden power failure. At this point, the Unix operating system is not as good as that of Microsoft. In the event of a power failure, the Windows operating system will automatically detect and recover when it is restarted, But Unix will not. We need to manually execute The fsck

As you know, there are times when it is necessary to terminate all Oracle processes (process) or a specified set of Oracle processes. When the database is "locked" and you are unable to enter Server Manager to "gently" terminate the database, you can terminate all Oracle processes with the KILL command in Unix-one of the common uses of the KILL command.When you need to terminate an Oracle instance (instance

In the process of using the UNIX operating system, we often use a variety of problems, such as the system suddenly slowed down, the system is prone to panic or the host of the terminal often appear panic, when we often guess, is hard disk space is too small, or insufficient memory? Is there a bottleneck in I/O, or is there a problem with the core parameters of the system? At this time, we should consider using the system to provide us with the SAR

Lienhua342014-10-15ISO C defines the system function for executing a command string in a program. Its statement is as follows, #include int system (const char *cmdstring); The system function calls the fork, exec, and WAITPID functions in its implementation. The system function calls the fork function to create the child process, and then calls '/bin/sh-c cmdstring ' to execute the command