使用Bash Shell检查文件是否存在的方法

test -e filename
[ -e filename ]
  
test -f filename
[ -f filename ]

[ -f /etc/hosts ] && echo "Found" || echo "Not found"

Found

#!/bin/bash
file="/etc/hosts"
if [ -f "$file" ]
then
 echo "$file found."
else
 echo "$file not found."
fi

-b FILE
  FILE exists and is block special
-c FILE
  FILE exists and is character special
-d FILE
  FILE exists and is a directory
-e FILE
  FILE exists
-f FILE
  FILE exists and is a regular file
-g FILE
  FILE exists and is set-group-ID
-G FILE
  FILE exists and is owned by the effective group ID
-h FILE
  FILE exists and is a symbolic link (same as -L)
-k FILE
  FILE exists and has its sticky bit set
-L FILE
  FILE exists and is a symbolic link (same as -h)
-O FILE
  FILE exists and is owned by the effective user ID
-p FILE
  FILE exists and is a named pipe
-r FILE
  FILE exists and read permission is granted
-s FILE
  FILE exists and has a size greater than zero
-S FILE
  FILE exists and is a socket
-t FD file descriptor FD is opened on a terminal
-u FILE
  FILE exists and its set-user-ID bit is set
-w FILE
  FILE exists and write permission is granted
-x FILE
  FILE exists and execute (or search) permission is granted

if [ operator FileName ]
then
  echo "FileName - Found, take some action here"
else
 echo "FileName - Not found, take some action here"
fi