mirror of
https://github.com/dunwu/linux-tutorial.git
synced 2024-04-15 19:55:24 +08:00
23 lines
484 B
Bash
23 lines
484 B
Bash
|
#!/usr/bin/env bash
|
||
|
|
|
||
|
|
################### 声明变量 ###################
|
||
|
|
word="hello"
|
||
|
|
echo ${word}
|
||
|
|
# Output: hello
|
||
|
|
|
||
|
|
################### 只读变量 ###################
|
||
|
|
rword="hello"
|
||
|
|
echo ${rword}
|
||
|
|
# Output: hello
|
||
|
|
readonly rword
|
||
|
|
# rword="bye" # 如果放开注释，执行时会报错
|
||
|
|
|
||
|
|
################### 删除变量 ###################
|
||
|
|
dword="hello" # 声明变量
|
||
|
|
echo ${dword} # 输出变量值
|
||
|
|
# Output: hello
|
||
|
|
|
||
|
|
unset dword # 删除变量
|
||
|
|
echo ${dword}
|
||
|
|
# Output: （空）
|