我必须在Postgresql实例上安装特定版本的AWS-EC2。
我遵循了教程：Setting up PostgreSQ。
过去，我按照教程进行操作，效果很好。这次，因为我需要9.6版本，所以我有点扭曲：
$ sudo yum install postgresql96 postgresql96-server postgresql96-devel postgresql96-contrib postgresql96-docs
安装正常。我现在正在尝试恢复设置：
sudo postgresql-setup initdb
，并出现以下错误：
$ sudo postgresql-setup initdb
sudo: postgresql-setup: command not found
为此我也尝试了以下方法。
$ sudo postgresql96-setup initdb
sudo: postgresql96-setup: command not found
$ ls -ila /etc/rc.d/init.d
total 264
393352 drwxr-xr-x 2 root root 4096 Nov 5 08:25 .
393347 drwxr-xr-x 10 root root 4096 Aug 26 18:05 ..
393961 -rwxr-xr-x 1 root root 1729 Mar 27 2017 acpid
394280 -rwxr-xr-x 1 root root 2062 Aug 16 2016 atd
394415 -rwxr-xr-x 1 root root 3448 Mar 8 2017 auditd
394323 -r-xr-xr-x 1 root root 1362 Mar 30 2017 blk-availability
394399 lrwxrwxrwx 1 root root 46 Aug 26 18:05 cfn-hup -> /opt/aws/apitools/cfn-init/init/redhat/cfn-hup
393935 -rwxr-xr-x 1 root root 5160 Feb 28 2014 cgconfig
393936 -rwxr-xr-x 1 root root 3580 Feb 28 2014 cgred
394243 -rwxr-xr-x 1 root root 3782 Oct 4 2018 cloud-config
394244 -rwxr-xr-x 1 root root 3763 Oct 4 2018 cloud-final
394245 -rwxr-xr-x 1 root root 3855 Oct 4 2018 cloud-init
394246 -rwxr-xr-x 1 root root 3840 Oct 4 2018 cloud-init-local
394058 -rwxr-xr-x 1 root root 2826 Sep 28 2016 crond
393819 -rw-r--r-- 1 root root 25651 Aug 17 2017 functions
393820 -rwxr-xr-x 1 root root 6037 Aug 17 2017 halt
394186 -rwxr-xr-x 1 root root 1395 Dec 13 2017 hibagent
394131 -rwxr-xr-x 1 root root 2267 Nov 12 2018 hibinit-agent
393401 -rwxr-xr-x 1 root root 8563 Sep 27 2013 ip6tables
393402 -rwxr-xr-x 1 root root 8468 Sep 27 2013 iptables
394156 -rwxr-xr-x 1 root root 1955 Oct 29 2018 irqbalance
393821 -rwxr-xr-x 1 root root 652 Jan 18 2017 killall
394324 -r-xr-xr-x 1 root root 2137 Mar 30 2017 lvm2-lvmetad
394325 -r-xr-xr-x 1 root root 2274 Mar 30 2017 lvm2-lvmpolld
394326 -r-xr-xr-x 1 root root 3045 Mar 30 2017 lvm2-monitor
394211 -rwxr-xr-x 1 root root 2904 Sep 18 2014 mdmonitor
394195 -rwxr-xr-x 1 root root 2200 Jul 2 17:59 messagebus
393822 -rwxr-xr-x 1 root root 4334 Jan 18 2017 netconsole
393823 -rwxr-xr-x 1 root root 5309 Jan 18 2017 netfs
393824 -rwxr-xr-x 1 root root 6742 Aug 17 2017 network
394003 -rwxr-xr-x 1 root root 6703 Oct 8 2015 nfs
394074 -rwxr-xr-x 1 root root 3526 Oct 8 2015 nfslock
394152 -rwxr-xr-x 1 root root 1926 May 3 2019 ntpd
393919 -rwxr-xr-x 1 root root 2049 May 3 2019 ntpdate
394548 -rwxr-xr-x 1 root root 7949 Dec 4 2018 postgresql96
394426 -rwxr-xr-x 1 root root 1556 Sep 10 2014 psacct
393778 -rwxr-xr-x 1 root root 2034 Sep 27 2013 quota_nld
393748 -rwxr-xr-x 1 root root 1515 May 17 2016 rdisc
394296 -rwxr-xr-x 1 root root 1816 Aug 17 2017 rngd
393273 -rwxr-xr-x 1 root root 2073 May 9 2018 rpcbind
394082 -rwxr-xr-x 1 root root 2518 Oct 8 2015 rpcgssd
394084 -rwxr-xr-x 1 root root 2305 Oct 8 2015 rpcidmapd
394087 -rwxr-xr-x 1 root root 2464 Oct 8 2015 rpcsvcgssd
393972 -rwxr-xr-x 1 root root 2011 Nov 11 2014 rsyslog
393643 -rwxr-xr-x 1 root root 2056 Sep 10 2014 saslauthd
394014 -rwxr-xr-x 1 root root 3702 Aug 17 2016 sendmail
393825 -rwxr-xr-x 1 root root 647 Jan 18 2017 single
394647 -rwxr-xr-x 1 root root 4180 Oct 23 23:47 sshd
393639 -rwxr-xr-x 1 root root 1642 Mar 19 2014 udev-post