Linux 如何测试两个文件是否存在？
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How to test for if two files exist?
提问by Sandra Schlichting
I would like to check if both files exist, but I am getting
我想检查两个文件是否存在，但我得到
test.sh: line 3: [: missing `]'
Can anyone see what's wrong?
任何人都可以看到有什么问题吗？
#!/bin/sh
if [ -f .ssh/id_rsa && -f .ssh/id_rsa.pub ]; then
echo "both exist"
else
echo "one or more is missing"
fi
采纳答案by Raghuram
Try adding an additional square bracket.
尝试添加一个额外的方括号。
if [[ -f .ssh/id_rsa && -f .ssh/id_rsa.pub ]]; then
回答by Michael Krelin - hacker
[ -f .ssh/id_rsa -a -f .ssh/id_rsa.pub ] && echo both || echo not
or
或者
[[ -f .ssh/id_rsa && -f .ssh/id_rsa.pub ]] && echo both || echo not
also, if you for the [[ ]]solution, you'll probably want to change #!/bin/shto #!/bin/bashin compliance with your question's tag.
此外，如果您[[ ]]想要解决方案，您可能希望更改#!/bin/sh为#!/bin/bash符合您问题的标签。
回答by j?rgensen
[[is bash-specific syntax. For POSIX-compatible shells, you need:
[[是 bash 特定的语法。对于 POSIX 兼容的 shell，您需要：
[ -f file1 ] && [ -f file2 ]
回答by sat
if [ -e .ssh/id_rsa -a -e .ssh/id_rsa.pub ]; then
echo "both exist"
else
echo "one or more is missing"
fi
Here,
这里，
-e check only the file is exits or not.If exits,it return true.else,it return false.
-e 只检查文件是否退出。如果退出，则返回true。否则返回false。
-f also do the same thing but,it check whether the given file is regular file or not.based on that it return the true/false.
-f 也做同样的事情，但是，它检查给定的文件是否是常规文件。基于它返回真/假。
Then you are using &&.So that,It need two [[ .. ]] brackets to execute.
然后你使用&&。所以，它需要两个 [[ .. ]] 括号来执行。
instead you can use the -a [same as && operator] -o [same as || operator]. If you need more information go through this link
相反，您可以使用 -a [与 && 运算符相同] -o [与 || 相同 操作员]。如果您需要更多信息，请访问此链接
