Determine whether the file exists in linux

#In Linux shell, -f is generally used to determine whether the file exists; -d is used to determine the directory.

[[ -f 文件名 ]] && echo yes

If yes is printed, it means that the file can be detected by the current user        (Recommended learning: linux operation and maintenance)

-e filename 如果 filename存在，则为真
-d filename 如果 filename为目录，则为真
-f filename 如果 filename为常规文件，则为真
-L filename 如果 filename为符号链接，则为真
-r filename 如果 filename可读，则为真
-w filename 如果 filename可写，则为真
-x filename 如果 filename可执行，则为真
-s filename 如果文件长度不为0，则为真
-h filename 如果文件是软链接，则为真

Common examples

If a file exists, delete it

if [ -f trials ]; then rm ${result_path}trials; fi

If there is no folder, create it

if [ ! -d $result_name ];then
      mkdir -p $result_name
fi

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