crontab をインストールした時のメモ。なぜかパッケージ名が、crontabs。なぜcrontabじゃない?!まいいや。
パッケージ名は、crontabsなので気を付けて。

# yum install crontabs
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
 * base: ftp.tsukuba.wide.ad.jp
 * extras: ftp.tsukuba.wide.ad.jp
 * updates: ftp.tsukuba.wide.ad.jp
Setting up Install Process
Resolving Dependencies
There are unfinished transactions remaining. You might consider running yum-complete-transaction first to finish them.
--> Running transaction check
---> Package crontabs.noarch 0:1.10-33.el6 will be installed
--> Processing Dependency: /etc/cron.d for package: crontabs-1.10-33.el6.noarch
--> Running transaction check
---> Package cronie.x86_64 0:1.4.4-12.el6 will be installed
--> Processing Dependency: dailyjobs for package: cronie-1.4.4-12.el6.x86_64
--> Running transaction check
---> Package cronie-anacron.x86_64 0:1.4.4-12.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================================================================================================================================================================================
 Package                                                       Arch                                                  Version                                                       Repository                                           Size
=============================================================================================================================================================================================================================================
Installing:
 crontabs                                                      noarch                                                1.10-33.el6                                                   base                                                 10 k
Installing for dependencies:
 cronie                                                        x86_64                                                1.4.4-12.el6                                                  base                                                 73 k
 cronie-anacron                                                x86_64                                                1.4.4-12.el6                                                  base                                                 30 k

Transaction Summary
=============================================================================================================================================================================================================================================
Install       3 Package(s)

Total download size: 114 k
Installed size: 220 k
Is this ok [y/N]:y     ←y を入力してEnterを押してね。
Downloading Packages:
(1/3): cronie-1.4.4-12.el6.x86_64.rpm                                                                                                                                                                                 |  73 kB     00:00
(2/3): cronie-anacron-1.4.4-12.el6.x86_64.rpm                                                                                                                                                                         |  30 kB     00:00
(3/3): crontabs-1.10-33.el6.noarch.rpm                                                                                                                                                                                |  10 kB     00:00
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                                                                                                                        709 kB/s | 114 kB     00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Warning: RPMDB altered outside of yum.
** Found 13 pre-existing rpmdb problem(s), 'yum check' output follows:
ca-certificates-2013.1.95-65.1.el6_5.noarch is a duplicate with ca-certificates-2013.1.94-65.0.el6.noarch
coreutils-8.4-31.el6_5.1.x86_64 is a duplicate with coreutils-8.4-31.el6.x86_64
coreutils-libs-8.4-31.el6_5.1.x86_64 is a duplicate with coreutils-libs-8.4-31.el6.x86_64
grep-2.6.3-4.el6_5.1.x86_64 is a duplicate with grep-2.6.3-4.el6.x86_64
krb5-libs-1.10.3-15.el6_5.1.x86_64 is a duplicate with krb5-libs-1.10.3-10.el6_4.6.x86_64
nspr-4.10.2-1.el6_5.x86_64 is a duplicate with nspr-4.10.0-1.el6.x86_64
nss-util-3.15.3-1.el6_5.x86_64 is a duplicate with nss-util-3.15.1-3.el6.x86_64
openssl-1.0.1e-16.el6_5.7.x86_64 is a duplicate with openssl-1.0.1e-16.el6_5.x86_64
p11-kit-0.18.5-2.el6_5.2.x86_64 is a duplicate with p11-kit-0.18.5-2.el6.x86_64
p11-kit-trust-0.18.5-2.el6_5.2.x86_64 is a duplicate with p11-kit-trust-0.18.5-2.el6.x86_64
python-2.6.6-52.el6.x86_64 is a duplicate with python-2.6.6-51.el6.x86_64
python-libs-2.6.6-52.el6.x86_64 is a duplicate with python-libs-2.6.6-51.el6.x86_64
yum-plugin-fastestmirror-1.1.30-17.el6_5.noarch is a duplicate with yum-plugin-fastestmirror-1.1.30-14.el6.noarch
  Installing : cronie-1.4.4-12.el6.x86_64                                                                                                                                                                                                1/3
  Installing : crontabs-1.10-33.el6.noarch                                                                                                                                                                                               2/3
  Installing : cronie-anacron-1.4.4-12.el6.x86_64                                                                                                                                                                                        3/3
  Verifying  : crontabs-1.10-33.el6.noarch                                                                                                                                                                                               1/3
  Verifying  : cronie-anacron-1.4.4-12.el6.x86_64                                                                                                                                                                                        2/3
  Verifying  : cronie-1.4.4-12.el6.x86_64                                                                                                                                                                                                3/3

Installed:
  crontabs.noarch 0:1.10-33.el6

Dependency Installed:
  cronie.x86_64 0:1.4.4-12.el6                                                                                      cronie-anacron.x86_64 0:1.4.4-12.el6

Complete!
[6]+  Killed                  yum install crontabs

[対象]
CentOs 6.X