在服务器上运行 crontab -e编辑定时任务 结果提示 command not found命令找不到，这就说明没安装crontab

由于

完整操作如下：

[root@iZ11pvsxisqZ /]# yum install vixie-cron crontabsLoaded plugins: securitySetting up Install ProcessPackage cronie-1.4.4-15.el6_7.1.x86_64 already installed and latest versionPackage crontabs-1.10-33.el6.noarch already installed and latest versionNothing to do[root@iZ11pvsxisqZ /]# crontab -lno crontab for root[root@iZ11pvsxisqZ /]# service crond statuscrond is stopped[root@iZ11pvsxisqZ /]# service crond startStarting crond:                                            [  OK  ][root@iZ11pvsxisqZ /]# ntsysv[root@iZ11pvsxisqZ /]# chkconfig –level 35 crond onchkconfig version 1.3.49.3 - Copyright (C) 1997-2000 Red Hat, Inc.This may be freely redistributed under the terms of the GNU Public License.usage:   chkconfig [--list] [--type 
     
      ] [name]         chkconfig --add 
      
                chkconfig --del 
       
                 chkconfig --override 
        
                  chkconfig [--level 
         
          ] [--type 
          
           ] 
            
            
             [root@iZ11pvsxisqZ /]# crontab -eno crontab for root - using an empty onecrontab: no changes made to crontab
            
           
          
         
        
       
      
     

分步操作为

开始安装 运行 

yum install vixie-cron crontabs

然后它返回很多

Loaded plugins: securitybase                                                                                                                                                                epel                                                                                                                                                                epel/primary_db                                                                                                                                                     extras                                                                                                                                                              updates                                                                                                                                                             Setting up Install ProcessResolving Dependencies--> Running transaction check---> Package cronie.x86_64 0:1.4.4-15.el6_7.1 will be installed--> Processing Dependency: dailyjobs for package: cronie-1.4.4-15.el6_7.1.x86_64--> Processing Dependency: /usr/sbin/sendmail for package: cronie-1.4.4-15.el6_7.1.x86_64--> Running transaction check---> Package cronie-anacron.x86_64 0:1.4.4-15.el6_7.1 will be installed--> Processing Dependency: crontabs for package: cronie-anacron-1.4.4-15.el6_7.1.x86_64---> Package exim.x86_64 0:4.84.2-3.el6 will be installed--> Running transaction check---> Package crontabs.noarch 0:1.10-33.el6 will be installed--> Finished Dependency ResolutionDependencies Resolved==================================================================================================================================================================== Package                                                              Arch                                                         Version                          ====================================================================================================================================================================Installing: cronie                                                               x86_64                                                       1.4.4-15.el6_7.1                 Installing for dependencies: cronie-anacron                                                       x86_64                                                       1.4.4-15.el6_7.1                  crontabs                                                             noarch                                                       1.10-33.el6                       exim                                                                 x86_64                                                       4.84.2-3.el6                     Transaction Summary====================================================================================================================================================================Install       4 Package(s)Total download size: 1.4 MInstalled size: 4.2 MDownloading Packages:(1/4): cronie-1.4.4-15.el6_7.1.x86_64.rpm                                                                                                                           (2/4): cronie-anacron-1.4.4-15.el6_7.1.x86_64.rpm                                                                                                                   (3/4): crontabs-1.10-33.el6.noarch.rpm                                                                                                                              (4/4): exim-4.84.2-3.el6.x86_64.rpm                                                                                                                                 --------------------------------------------------------------------------------------------------------------------------------------------------------------------Total                                                                                                                                                               Running rpm_check_debugRunning Transaction TestTransaction Test SucceededRunning Transaction  Installing : exim-4.84.2-3.el6.x86_64                                                                                                                               Installing : cronie-1.4.4-15.el6_7.1.x86_64                                                                                                                         Installing : crontabs-1.10-33.el6.noarch                                                                                                                            Installing : cronie-anacron-1.4.4-15.el6_7.1.x86_64                                                                                                                 Verifying  : crontabs-1.10-33.el6.noarch                                                                                                                            Verifying  : cronie-1.4.4-15.el6_7.1.x86_64                                                                                                                         Verifying  : exim-4.84.2-3.el6.x86_64                                                                                                                               Verifying  : cronie-anacron-1.4.4-15.el6_7.1.x86_64                                                                                                               Installed:  cronie.x86_64 0:1.4.4-15.el6_7.1                                                                                                                                  Dependency Installed:  cronie-anacron.x86_64 0:1.4.4-15.el6_7.1                                                          crontabs.noarch 0:1.10-33.el6                                   Complete!

然后我运行 crontab -l 

提示 no crontab for root

然后我查看crontab服务状态

service crond status

它提示 crond is stopped

然后我运行service crond start

它提示 Starting crond:                                            [  OK  ]

然后我查看开机启动项 ntsysv

然后界面是

然后我把这个服务加入开机服务中 chkconfig –level 35 crond on

然后它提示

[root@iZ11pvsxisqZ /]# chkconfig –level 35 crond onchkconfig version 1.3.49.3 - Copyright (C) 1997-2000 Red Hat, Inc.This may be freely redistributed under the terms of the GNU Public License.usage:   chkconfig [--list] [--type 
     
      ] [name]         chkconfig --add 
      
                chkconfig --del 
       
                 chkconfig --override 
        
                  chkconfig [--level 
         
          ] [--type 
          
           ] 
            
            
           
          
         
        
       
      
     

然后我 crontab -e 就进入了定时任务的编辑界面中