a1023182899
Ordinary programmer
采纳率50%
2020-08-20 15:43 阅读 136

linux shell中的if [ ! -f /etc/dnsmasq.conf ]是什么意思?

代码如下图所示

if [ ! -f /etc/dnsmasq.conf ]; then
echo "警告!dnsmasq安装失败!"
read
fi
if [ ! -d /etc/openvpn ]; then
echo "警告!OpenVPN安装失败!"
read
fi

谁能讲解一下这个if [ ! -f /etc/dnsmasq.conf ]和-d分别是什么意思?

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2条回答 默认 最新

  • 已采纳
    shenshucong520 glustful 2020-08-20 16:05

    -a file exists.
    -b file exists and is a block special file.
    -c file exists and is a character special file.
    -d file exists and is a directory.
    -e file exists (just the same as -a).
    -f file exists and is a regular file.
    -g file exists and has its setgid(2) bit set.
    -G file exists and has the same group ID as this process.
    -k file exists and has its sticky bit set.
    -L file exists and is a symbolic link.
    -n string length is not zero.
    -o Named option is set on.
    -O file exists and is owned by the user ID of this process.
    -p file exists and is a first in, first out (FIFO) special file or
    named pipe.
    -r file exists and is readable by the current process.
    -s file exists and has a size greater than zero.
    -S file exists and is a socket.
    -t file descriptor number fildes is open and associated with a
    terminal device.
    -u file exists and has its setuid(2) bit set.
    -w file exists and is writable by the current process.
    -x file exists and is executable by the current process.
    -z string length is zero.

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  • caozhy 从今以后生命中的每一秒都属于我爱的人 2020-08-20 15:57

    -r filename 如果 filename存在并且可读,则为真

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