linux list cron jobs

commands under Linux to control task jobs executionThe following commands can be used to manipulate process tasks:PS Lists the processes that are running in the system;Kill sends a signal to one or more processes (often used to kill a process);Jobs lists the status of tasks that are started in the current shell environment, and if JOBSID is not specified, displa

shell commands under Linux to control task jobs executionThe following commands can be used to manipulate process tasks:PS Lists the processes that are running in the system;Kill sends a signal to one or more processes (often used to kill a process);Jobs lists the status of tasks that are started in the current shell environment, and if JOBSID is not specified,

FG, BG, Jobs, , CTRL + Z are all related to system tasks, although these commands are largely not needed now, but they are also usefulA . is most often usedThis is used at the end of a command, you can put this command in the background to executeTwo. Ctrl + ZYou can put a command that is executing in the foreground in the background and pauseThree. JobsSee how many commands are currently running in the backgroundFour. FGMove commands in the backgroun

SETSID program [Arg ...] DESCRIPTION Setsid runs a program in a new session.Visible Setsid is also very convenient to use, but also only need to deal with the command before adding Setsid can.Setsid Example[[email protected] ~]# setsid ping www.ibm.com[[email protected] ~]# ps-ef |grep www.ibm.comroot 31094 1 > 0 07:28? 00:00:00 Ping www.ibm.comroot 31102 29217 0 07:29 pts/4 00:00:00 grep www.ibm.com[[email protected] ~]#It is worth noting that our process ID (PI

FG, BG, Jobs, , Nohup, CTRL + Z command one, Add to the end of a command, you can put this command in the background execution, such as Gftp Two, CTRL + ZYou can put a command that is being executed in the foreground in the background and is paused, not executableThird, JobsSee how many commands are currently running in the background The JOBS-L option shows that the pid,

One, the following commands can be used to manipulate process tasks:PS Lists the processes that are running in the system.kill sends a signal to one or more processes (often used to kill a process).Jobs Lists the status of the tasks that are started in the current shell environment and displays all active task status information if jobsidis not specified, or if a task is reported to be terminated (that is, the status of the task is marked as Terminate

1, describe the composition of the computer and its functions.Modern computer systems follow the von Neumann architecture, which consists of the following components:Arithmetic: Used for binary arithmetic and logic operation;Controller: Used to control the coordination of computer components, is a scheduling control center;Memory: Used to store data, usually referred to as memory. Store the data that participates in the calculation including the result;Input device: Used to enter data into a com

Content of this week's job:1. List the user name of all logged-in users on the current system, note: The same user logged in multiple times, only once.#who | tr-s [[: Space:]] | Cut-d ""-f1 | Sort-u[email protected] bin]# who | tr-s [[: Space:]] | Cut-d ""-f1 | Sort-uKzxjwbRoot2. Remove the information about the user who last logged in to the current system.#last | Head-1[Email protected] bin]# Last | Head-1Root PTS/4 223.72.80.48 Mon Oct 23:07 still

Communication Programming game Programming Multimedia Linux plug-in programming API image processing embedded/Microcontroller database programming console process and thread Network security assembly language Hardware programming software Design Engineering Standard Rules. The generation of programming languages or tools including, but not limited to, the following ranges:C/c++/c# WriteJava Write generationIt generationPython writesTutoring Programmi

device file directory/dev9) Click to enter the profile directory/etc Browsing, management and maintenance of unit fifth catalog files (ii) 1) turn on the Linux operating system and require the root user to log in to the GNOME GUI, right click on the desktop to open the terminal2) Use the command to switch to the root user's home directoryCD ~3) determine the working directory where the current user is locatedPwd4) Create a directory WGMKDIR WG5) Cre

' ${r.png "alt=" Wkiom1lwtd3alj9taab5azft3bc519.png "style=" padding:0px;margin:0px; Vertical-align:top;border:none; "/>650) this.width=650; "src=" Https://s3.51cto.com/wyfs02/M00/9A/7E/wKiom1lWTQGh3RZPAAA7mbCy0XM416.png "title=" $AS 3 ' K_KZTR (N) ' h{8 ' @6{o.png "alt=" Wkiom1lwtqgh3rzpaaa7mbcy0xm416.png "style=" Padding:0px;margin:0px;vertical-align: Top;border:none; "/>4, what is the metadata information of the file, what does it mean, how to view it? How to modify timestamp information for

Convert content in/etc/issue file to uppercase and save to/tmp/issue.out file 650) this.width=650; "Src=" Http://s1.51cto.com/wyfs02/M00/85/4B/wKiom1efN8nCvjwdAABwtCfe9_o112.png-wh_500x0-wm_3 -wmp_4-s_3141871828.png "title=" 1.png "alt=" Wkiom1efn8ncvjwdaabwtcfe9_o112.png-wh_50 "/>2. Convert the current system login user's information to uppercase and save to the/tmp/who.out file650) this.width=650; "Src=" Http://s1.51cto.com/wyfs02/M02/85/4B/wKiom1efOGvxG22tAABXcXZq300101.png-wh_500x0-wm_3

level init0,-R Restart now immediately, or specify the time, and give notice-h/h, specify the time off, and inform the userPower off is similar to shutdown-h now, reboot similar to Shutdown-r nowHwclock display hardware clock--set--date= "month/day/year HH:MM:SS" Set hardware clock--hctosys sync to system clockDate display system clock,-s ' 10:10:10 ' set clock, +%y%m%d%h%m%s by Format-u set to GMT,-r 3. Get command Help: Please list in detail and de

#允许虚拟用户账号访问guest_username =vuser# Gusest user mapping to vusermax_clients=200 #最多同时允许100个客户连接 anonymous_enable=YES #允许匿名用户访问local_enable =yesanon_max_rate=512000# Limit anonymous transfer rate to 512kb/sanon_upload_enable=no #anonymous是否具有上传的权限anon_mkdir_write_enable=no #anonymous是否具有建立目录的权限anon_other_write_enable =no #anonymous是否具有写入的权限chroot_local_user =yes #对用户访问只限制在主目录不能访问其他目录user_config_dir =/etc/vsftpd/vusers# Virtual Account Configuration Directory pam_service_name=vsftpd.mysql[[em

network parameters for network interfaces in the Linux kernel[email protected] ~]# ifconfige Cho: used to print the value of a shell variable in the shell, or to output the specified string directly. [email protected] ~]# Echo " Hello World " //Output Hello worldT ty: Displays the file name of the terminal connection standard input device. [email protected] ~]# tty-s// no information is displayed, only the status code is returned. s TARTX: Using the

Q: Describe the composition and function of the computer?A: The computer has the arithmetic, the controller, the memory, the input device, the output device composition. Function: Solve people's specific needs and improve efficiency.Q: List Linux distributions by series and describe the connections and differences between different distributions?A: There are redhat, Centos,fedora; SuSE, and open SuSE, Debia

1. List the user name of all logged-in users on the current system, note: The same user logged in multiple times, only once.[Email protected] desktop]# whoXu Tty5 2016-08-21 23:20Root tty1 2016-08-21 23:12 (: 0)Root pts/0 2016-08-21 23:13 (: 0.0)[Email protected] Desktop]# who | Cut-d '-f1 |sort-uRootXu2. Remove the information about the user who last logged in to the current system.[[Email protected] Desktop]# last | Head-1Xu Tty5 Sun 23:20 still log

1. List the user name of all logged-in users on the current system, note: The same user logged in multiple times, only once.[Email protected] desktop]# whoXu Tty5 2016-08-21 23:20Root tty1 2016-08-21 23:12 (: 0)Root pts/0 2016-08-21 23:13 (: 0.0)[Email protected] Desktop]# who | Cut-d '-f1 |sort-uRootXu2. Remove the information about the user who last logged in to the current system.[[Email protected] Desktop]# last | Head-1Xu Tty5 Sun 23:20 still log

Content of this week's job:1, create a 10G partition, and the format of the Ext4 file system;(1) The block size is required to 2048, the reserved space percentage is 2, the volume label is MyData, the default Mount property contains ACLs;[Email protected]:~# FDISK/DEV/SDACommand (M for help): Pdisk/dev/sda:1000.2 GB, 1000204886016 bytes255 heads, Sectors/track, 121601 cylinders, total 1953525168 sectorsUnits = sectors of 1 * MB = bytesSector size (logical/physical): bytes/512 bytesI/O size (mini

shell2. Write a script(1) Obtain the host name of the current host and save it in the hostname variable;(2) Determine if the value of this variable is localhost, and if so, modify the current hostname to www.magedu.com;(3) Otherwise, the current host name is displayed;1) Edit File]# vim hostname.sh#!/bin/bash# Get current system hostnameHostname= ' hostname ' #使用反引号获取If ["$hostname" = = "localhost"]; ThenHostname www.magedu.comecho "Hostname have changed to Www.magedu.com"Elseecho "Current host