How to use hybrid format to output ISO files? isohybrid：command not found

1. install syslinux：yum install syslinux

The execution process is as follows ：

[[email protected] new_centos]# yum install syslinux
Loaded plugins: fastestmirror, priorities
Loading mirror speeds from cached hostfile
 * base: mirrors.bupt.edu.cn
 * epel: mirrors.bfsu.edu.cn
 * extras: mirrors.bfsu.edu.cn
 * updates: mirrors.bfsu.edu.cn
Resolving Dependencies
--> Running transaction check
---> Package syslinux.x86_64 0:4.05-15.el7 will be installed
--> Processing Dependency: mtools for package: syslinux-4.05-15.el7.x86_64
--> Running transaction check
---> Package mtools.x86_64 0:4.0.18-5.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

===========================================================================================================================================================
 Package                              Arch                               Version                                    Repository                        Size
===========================================================================================================================================================
Installing:
 syslinux                             x86_64                             4.05-15.el7                                base                             990 k
Installing for dependencies:
 mtools                               x86_64                             4.0.18-5.el7                               base                             203 k

Transaction Summary
===========================================================================================================================================================
Install  1 Package (+1 Dependent package)

Total download size: 1.2 M
Installed size: 2.6 M
Is this ok [y/d/N]: y
Downloading packages:
(1/2): mtools-4.0.18-5.el7.x86_64.rpm                                                                                               | 203 kB  00:00:01     
(2/2): syslinux-4.05-15.el7.x86_64.rpm                                                                                              | 990 kB  00:00:01     
-----------------------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                                      507 kB/s | 1.2 MB  00:00:02     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : mtools-4.0.18-5.el7.x86_64                                                                                                              1/2 
  Installing : syslinux-4.05-15.el7.x86_64                                                                                                             2/2 
  Verifying  : mtools-4.0.18-5.el7.x86_64                                                                                                              1/2 
  Verifying  : syslinux-4.05-15.el7.x86_64                                                                                                             2/2 

Installed:
  syslinux.x86_64 0:4.05-15.el7                                                                                                                            

Dependency Installed:
  mtools.x86_64 0:4.0.18-5.el7                                                                                                                             

Complete!
[[email protected] new_centos]# isohybrid --version
isohybrid version 0.12