我写这是为了检查你的输入，看它是否是这个bash脚本y，n或别的东西（这将是一个更大的项目的一部分）：
#!/bin/bash
echo "Have you updated the PATH variable in your .bashrc file yet? [y/n]"
read response
if [$response = "y"]; then
echo "Checkpoint passed"
set $checkpoint = "t"
elif [$response = "n"]; then
echo "Please set the PATH variable in your .bashrc file before running this script."
set $checkpoint = "f"
else
echo "Please only use 'y' and 'n'."
set $checkpoint = "f"
fi
但是每次运行它时，无论我输入什么内容，都会得到与该错误类似的错误：
Have you updated the PATH variable in your .bashrc file yet? [y/n]
y
./snbjdkhome: line 6: [y: command not found
./snbjdkhome: line 9: [y: command not found
Please only use 'y' and 'n'.
那么我的代码有什么问题呢？（我对shell脚本非常陌生。）
这将使您清楚（检查空白）：
$ var=c
$ ["$var" == "c"] && echo "OK"
[c: command not found
$ ["$var" == "c" ] && echo "OK"
[c: command not found
$ [ "$var" == "c"] && echo "OK"
bash: [: missing `]'
$ [ "$var" == "c" ] && echo "OK"
OK
因此，在使用test（[ ]）命令时，需要在条件之前和之后放置空格。
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我来说两句