the meta character in linux soft quoting

[root@Z ~]# echo n
n
[root@Z ~]# echo "n"
n
[root@Z ~]# echo 'n'
n

And

[root@Z ~]# echo ''

[root@Z ~]# echo ""

[root@Z ~]# echo 

What’s the problem?

soft quoting can disable or not???


Source: linux

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