${#array}
${#array[0]} #同上。 ${#array[*]} 、${#array[@]}。注意同#{array:0}的區別

array=( [0]=one [1]=two [2]=three [3]=four )
${array[@]:1} # two three four,除掉第一個元素后所有元素，那么${array[@]:0}表示所有元素
${array[@]:0:2} # one two
${array[@]:1:2} # two three

[root@localhost dev]# echo ${array[@]:0}
one two three four

[root@localhost dev]# echo ${array[@]#t*e} # 左邊開始最短的匹配:"t*e",這將匹配到"thre"
one two e four

[root@localhost dev]# echo ${array[@]##t*e} # 左邊開始最長的匹配,這將匹配到"three"
[root@localhost dev]# array=( [0]=one [1]=two [2]=three [3]=four )

[root@localhost dev]# echo ${array[@] %o} # 從字符串的結尾開始最短的匹配
one tw three four

[root@localhost dev]# echo ${array[@] %%o} # 從字符串的結尾開始最長的匹配
one tw three four

[root@localhost dev]# array=( [0]=one [1]=two [2]=three [3]=four )
第一個匹配到的，會被刪除
[root@localhost dev]# echo ${array[@] /o/m}
mne twm three fmur

所有匹配到的，都會被刪除
[root@localhost dev]# echo ${array[@] //o/m}
mne twm three fmur

沒有指定替換子串，則刪除匹配到的子符
[root@localhost dev]# echo ${array[@] //o/}
ne tw three fur

替換字符串前端子串
[root@localhost dev]# echo ${array[@] /#o/k}
kne two three four

替換字符串后端子串
[root@localhost dev]# echo ${array[@] /%o/k}
one twk three four