【现象】

[root@instance-6es4pt95 software]# rz
-bash: rz: command not found

【解决方法】安装lrzsz，具体操作如下

[root@instance-6es4pt95 software]# yum install lrzsz
Last metadata expiration check: 0:36:54 ago on Wed 23 Mar 2022 09:26:57 AM CST.
Dependencies resolved.
================================================================================
 Package        Architecture    Version                   Repository       Size
================================================================================
Installing:
 lrzsz          x86_64          0.12.20-43.el8            baseos           84 k

Transaction Summary
================================================================================
Install  1 Package

Total download size: 84 k
Installed size: 190 k
Is this ok [y/N]: y
Downloading Packages:
lrzsz-0.12.20-43.el8.x86_64.rpm                                                             12 MB/s |  84 kB     00:00    
---------------------------------------------------------------------------------------------------------------------------
Total                                                                                      8.2 MB/s |  84 kB     00:00     
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                                                                   1/1 
  Installing       : lrzsz-0.12.20-43.el8.x86_64                                                                       1/1 
  Running scriptlet: lrzsz-0.12.20-43.el8.x86_64                                                                       1/1 
  Verifying        : lrzsz-0.12.20-43.el8.x86_64                                                                       1/1 

Installed:
  lrzsz-0.12.20-43.el8.x86_64                                                                                              

Complete!
[root@instance-6es4pt95 software]#