How SSH remotely executes commands and exits automatically

The SSH command format is as follows:

USAGE:SSH [ -1246AACFGKKMNNQSTTVVXXYY] [-B bind_address] [-c Cipher_spec]  
           [-D [Bind_address:]port] [-e Escape_char] [F ConfigFile]  
           [I. PKCS11] [I. Identity_file]  
           [-l [Bind_address:]port:host:hostport]  
           [-L login_name] [M Mac_spec] [-O ctl_cmd] [-o option] [-P Port]  
           [R [Bind_address:]port:host:hostport] [-S Ctl_path]  
           [-W Host:port] [w Local_tun[:remote_tun]]  
           [User@]hostname [command]

Main parameter Description:

-L Specify Login user

-P Set the port number

-F background run, plus-n parameter is recommended

-n redirects standard input to/dev/null to prevent reading standard input

-N Do not execute remote commands, only port forwarding

-Q Quiet mode, ignoring all conversations and error prompts

-T disabling pseudo terminal configuration

SSH executes remote command format:

SSH [Options][remote Host][command]

Assume that the remote server IP is 192.168.110.34

Example: Viewing CPU information for a remote server

Ssh-l www-online 192.168.110.34 "Cat/proc/cpuinfo"

www-online@onlinedev01:~$ ssh-l www-online 192.168.110.34 "Cat/proc/cpuinfo" www-online@192.168.110.34 ' s password: processor:0 Vendor_id:genuineintel CPU Family:6 model:26 model Name:inte   
L (R) Xeon (r) CPU E5506 @ 2.13GHz stepping:5 CPU mhz:2128.000 cache size:4096 KB Fpu:yes fpu_exception:yes cpuid level:11 wp:yes VM E de PSE TSC MSR PAE MCE cx8 APIC Sep MTRR PGE MCA cmov Pat PSE36 clflush DTS ACPI MMX FXSR SSE SSE2 SS Syscall NX RDTSCP LM constant_tsc Arch_perfmon pebs BTS rep_good xtopology tsc_reliable nonstop_tsc aperfmperf pni ssse3 cx16 sse4_1 sse4_2  popcnt hypervisor lahf_lm bogomips:4256.00 clflush size:64 address cache_alignment:64 Bits physical, bits virtual power management:processor:1 Vendor_id:genuineintel CPU FA   Mily:6 model        : Model Name:intel (R) Xeon (r) CPU E5506 @ 2.13GHz stepping:5 CPU MHz:              2128.000 Cache size:4096 KB fpu:yes fpu_exception:yes cpuid level:11 wp : Yes Flags:fpu vme de PSE TSC MSR PAE MCE cx8 APIC Sep MTRR PGE MCA cmov Pat PSE36 clflush DTS ACPI mm X FXSR SSE SSE2 SS Syscall NX rdtscp LM constant_tsc Arch_perfmon pebs BTS rep_good xtopology tsc_reliable NONSTOP_TSC Ape Rfmperf PNI ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm bogomips:4260.80 clflush size:64 cache_ alignment:64 address sizes:40 bits physical, and BITS virtual power management:

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