wq command in unix

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

Commands for interchange of date, time, and Unix timestamps in Linux Command lines At work, you often need to get the current Unix timestamp or convert the given timestamp to a date format that we can recognize, on the linux Command Line terminal, you can easily solve the problem by using several commands. 1. convert a

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

1. Password security The/etc/passwd file in the UNIX system contains all the information that the system needs to know about each user (the encrypted password may also be stored in the/etc/shadow file). /ETC/PASSWD contains the user's login name, encrypted password, user number, user group number, user comment, user home directory, and user The shell program used. Where the user number (UID) and the user group number (GID) are used to uniquely iden

There are many commands in the UNIX operating system that can be used to back up files. However, the root file system in the UNIX operating system is a relatively special file. In general, you must uninstall other file systems If you are backing up this type of file. Because the root file system is the ancestor of other filesystems, it backs up files in other file systems at the same time if not uninstalled

Brief introduction The crontab command is common in UNIX and unix-based operating systems, and is used to set periodically executed instructions. This command reads the instruction from the standard input device and stores it in a "crontab" file for later reading and execution. Typically, crontab stored instructions

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

The guy who is familiar with DOS is trying to make UNIX like DOS, One of them is to set the Unix prompt as $ p $ G. The following describes the method. The GNU bash (Bourne again shell) is more convenient for different shell settings)And KSh (Korn shell) and tcsh (enhanced version of CSH, CSH in Linux isSymbol connection ). The General Sh (Bourne shell) and CSH settings are cool. One by oneVarious shell se

As you know, it is sometimes necessary to terminate all Oracle processes or a specified set of Oracle processes. When the database ldquo; locks rdquo, and you cannot enter As you know, it is sometimes necessary to terminate all Oracle processes or a specified set of Oracle processes. When the database ldquo; locks rdquo, and you cannot enter 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 ca

In many cases, we need to terminate all Oracle processes ). When the database is "locked" and you cannot enter Server Manager to 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 UNIX server, perform the following steps:Terminate a

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