兩個反單引號的功用等於 $()
echo `ls /etc/passwd` `ls /etc/group`
/etc/passwd /etc/group
echo $(ls /etc/passwd $(ls /etc/group))
/etc/group /etc/passwd
兩個反單引號的功用等於 $()
echo `ls /etc/passwd` `ls /etc/group`
/etc/passwd /etc/group
echo $(ls /etc/passwd $(ls /etc/group))
/etc/group /etc/passwd
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