量化交易之linux篇 - 判断文件目录是否存在、文件内容是否为空

判断目录是否存在：
#!/bin/bash

if [ -d $HOME ]
then
    echo "$HOME exist."
    cd $HOME
    ls -a
else
    echo "$HOME not exist."
fi

判断文件是否存在：
#!/bin/bash

if [ -e $HOME ]
then
    echo "The objects is exist, is it a file?"
    if [ -f $HOME ]
    then
        echo "yes, it is a file"
    else 
        echo "no, it is not a file"
    fi
else
     echo "The objects is not exist."
fi

判断文件是否为空：
#!/bin/bash

file=shell.sh

if [ -s $file ]
then 
    echo "$file is exist, and have inside content."
    head -10 $file
else
     echo "$file is exist, and have no content."
fi