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  linux shell 中判断文件、目录是否存在的方法 -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
 常用例子
 如果存在某文件,则删除 复制代码if [ -f trials ]; then rm ${result_path}trials; fi
 如果没有文件夹,则创建 复制代码if [ ! -d $result_name ];then
   mkdir -p $result_name
fi
 shell命令判断文件或文件夹是否存在,先直接看实例:[size=1em] 复制代码#!/bin/sh
#判断文件存在,判断是否为文件夹等
testPath="/Volumes/MacBookProHD/Mr.Wen/08 shell命令"
testFile="/Volumes/MacBookProHD/Mr.Wen/08 shell命令/fileWen"
#判断文件夹是否存在 -d
if [[ ! -d "$testPath" ]]; then
 echo "文件夹不存在"
else
 echo "文件夹存在"
fi
#判断文件夹是否存在,并且具有可执行权限
if [[ ! -x "$testFile" ]]; then
 echo "文件不存在并且没有可执行权限"
else
 echo "文件存在并有可执行权限"
fi
#判断文件是否存在
if [[ ! -f "$testFile" ]]; then
 echo "文件不存在"
else
 echo "文件存在"
fi
 
 
 
 在shell命令脚本编写当中,会遇到各种对文件的判断,除了以上常用的判断,还有其他的可以使用,如下:
 
 | Conditional Logic on Files |  | -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. | 
 
 
 shell 判断文件内容是否改变 判断文件内容是否改变: 1)md5值判断 2)diff 判断 复制代码#添加日志时间戳
function fn_showlog()
{
  local curtime;
  curtime=`date +"%Y%m%d-%H:%M:%S"`
  echo "$curtime ------ $1";
}
#判断文件内容是否一致
function diff_file(){
  for file in `ls $1`
  do 
    if [ ! -f "$2$file" ];then
      fn_showlog "存在新增文件:$2$file"
      return 0
    else
      diff $file $2$file
      if [ $? -ne 0 ];then
        fn_showlog "文件内容发生变化:$file"
        return 0
      fi
    fi
  done
  return 1
}
diff_file "python*Ip" "/home/admin/tools/"
if [ $? -eq 0 ];then
  fn_showlog "内容发生改变......"
else 
  fn_showlog "内容未发生改变,退出脚本!"
  exit 0
fi
 
 
 
 
 linux shell 中判断文件、目录是否存在的方法 来自:https://www.jb51.net/article/186273.htm 
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