What's wrong with exec executing command times on Linux

Question 1:find:paths must precede expression[[email protected] data]# find/oracle/backup/exp/data-name exp_table01_db01_*.dmp.gz-atime +2 exec rm-rf {}\;Find:paths must precede expression:exp_table01_db01_20170928235039.dmp.gzDescription: When you

Linux configuration SSH Public key authentication, through the root user's password-free input SCP Channel

1.ssh-keygenSsh-keygen is a tool used by the unix-like system to generate and manage SSH public and private keys. 2. UsageThe most important options that are commonly used are:-B num Specifies how many bit-length keys are generated, in the units of

Linux application programming and network programming three Linux access system information

3.3.1. About the concept of time, GMT (1) GMT is Greenwich Mean Time, which is the local area of Greenwich. (2) What is the meaning of GMT time? "Use Greenwich local time as global international time" to describe the time of global events,

Deploying SVN on Linux

===================== deploying SVN ===================== on Linux2017-09-29 14:54:12Personal original, reproduced please specify, otherwise investigate legal liabilityLinux server-side installation configuration:.....................................

Drive overview of Linux driver development

Driver Overviewwhere is the drive used? The preparation of non-standard type equipment and the drive transplant of standard class equipment. drivers are actually accompanied by the Linux kernel. A piece of code can control our hardware to work, to

Installation and configuration of Tomcat on Linux

1. Download jdk and tomcat.    jdk:    http://www.oracle.com/technetwork/java/javase/downloads/ jdk7-downloads-1880260.html    tomcat:    http://tomcat.apache.org/download-70.cgi   2.JDK installation and Configuration .    (1) JDK installation    

The number of unread bytes of a Linux socket or file descriptor Fionread,msg_peek flag

Fionread is how many bytes are returned in the buffer .Input has an input buffer, using theint nread;IOCTL (0,fionread,&nread);can get the number of bytes in the buffer to be read. The value is placed in the Nread .Then you can read it. Nread = Read

Linux command shorthand and full name-2

Cal = Calendar calendars, calenderCat = CATenate connection, allowing continuouscd = Change DirectoryCHGRP = Change GRouPchmod = Change MODeChown = Change OWNerChsh = Change SHellCMP = CompareCobra = Common Object Request Broker ArchitectureComm =

Linux view CPU and memory usage

During system maintenance, it may be necessary to review the CPU usage at any time, and to analyze the system condition according to the corresponding information. In CentOS, you can view CPU usage by using the top command. After running the top

Linux View CPU count, number of cores, logical CPU number

Physical CPU: The physical CPU is relative to the virtual CPU concept, refers to the actual existence of the processor, is that we can see, the touch of the CPU, is inserted in the motherboard above.Physical Core: The number of physical cores that

The difference and summary of Linux hard link and soft connection

Diagram of the difference between soft and hard linksSummary of Hard Links Multiple files with the same Inode node number are hard-linked files; Delete a hard-link file or delete any of the source files, the file entity is not deleted;

Linux interprocess communication Pipeline (pipe), named pipe (FIFO) and signal (Signal)

Organize from the networkUnix IPC includes: piping (pipe), named pipe (FIFO) and signal (Signal)Piping (pipe)Pipelines can be used for communication between affinity processes, and well-known pipelines overcome the limitations of pipe without name,

Linux common commands (echo, date, LS, CD, history, CAT)

I. Linux common commands There are a lot of today we'll summarize the common entry commands:1.linux Shimonoseki command: Poweroff, init 0, Halt, Shutdown-h now2.linux Restart command: Reboot, init 6, Shutdown-r now3.shutdown command:Format: Shutdown

88 Linux System Administrator-required monitoring tools

With the continuous development of the Internet industry, a variety of monitoring tools are countless. Here is a list of the most complete monitoring tools on the Web. So you can have more than 80 ways to manage your machine. In this article, we

Linux operation Tip: "Can ' t open file for writing" or "Operation not permitted" workaround

The use of the VI command on Linux to modify a file content, found unable to save, each time after the use of ": q!" command can exit normally but use ": wq!" command to save the file and exit when the message appears:E212:can ' t open file for

Linux folder and file creation Delete command

Linux Delete Folder commandLinux Delete directory is very simple, many people are still accustomed to use rmdir, but once the directory is not empty, it fell into deep distress, now use the RM-RF command.Direct RM is available, but add two

Ways to get random numbers from Linux

The method of 1.1.1 Inux random number http://www.2cto.com/kf/201410/342717.htmlMethod one. [[Email protected] ~]# date +%n%N nanoseconds randomly acquired nine-digit pass time823015723Get random numbers by time (date)Date +%s%n #生成19位数字, 12877648070

Different--diff commands for comparing two text files under Linux

Features of the 1>diff commandThe function of the diff command in Linux is to compare two text files on a line-by-row basis, listing their differences. It checks the given file for a system and displays all the different rows in the two files

The DNS request process and resource record definition for---------Linux

DNS type/synchronization type/domain and region differencesSOA internal Data characteristicsImplementation of DNS load balancing (load balance)Caching DNS serversCache definition, action, multilevel cachingA full parse requestResolve the answerDNS

Introduction to Jiffies and its functions in Linux kernel and a detailed description of jiffies and other related functions

Two global variables involved in Linux clock interrupts one is xtime, it is the TIMEVAL data structure variable, the other is the jiffies, first of all, look at the timeval structurestruct Timeval{time_t tv_sec; /***second***/susecond_t

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