unary operator expected问题

beyond911

以下是port.sh的内容
#! /bin/bash
# program: Using to study the [if... then ...fi] program
# Written by :Beyond
# date: 2007/06/15
# content: I will be using this program to show your services
# 1. print the program's work in your screen
  echo "Now, the services of your Linux system will be detect!"
  echo "The www, ftp, ssh, and sendmail + pop3 will be detect!"
  echo " "
# 2. www
  www='netstat -an|grep LISTEN|grep :80'

  if [ "$www" !="" ]; then
    echo "www is running"
  else
    echo "www is not running"
fi
# 3. ftp
  ftp='netstat -an|grep LISTEN|grep :21'
   if [ "$ftp" !="" ]; then
    echo "FTP is running"
else
  echo "FTP is NOT running"
fi
# 4. ssh
  ssh='netstat -an|grep LISTEN|grep :22'
if [ "$ssh" !="" ]; then
     echo "SSH is running"
else
    echo "SSH is NOT running"
fi
# 5. sendmail + pop3
  smtp='netstat -an|grep LISTEN|grep :25'
  pop3='netstat -an|grep LISTEN|grep :110'
if [ "$smtp" !="" ] && [ "$pop3"!="" ]; then
    echo "sendmail is ok!"
elif  [ "$smtp" != "" ] && [ "$pop3"="" ]; then
    echo "sendmail have some problem of your pop3"
elif  [ "&smtp"= "" ]&& [ "$pop3" !="" ]; then
    echo "sendmail have some proble of your smtp"
else
    echo "sendmail is NOT running"
fi

然后运行后出现以下
Now, the services of your Linux system will be detect!
The www, ftp, ssh, and sendmail + pop3 will be detect!

port.sh: line 13: [: netstat -an|grep LISTEN|grep :80: unary operator expected
www is not running
port.sh: line 20: [: netstat -an|grep LISTEN|grep :21: unary operator expected
FTP is NOT running
port.sh: line 27: [: netstat -an|grep LISTEN|grep :22: unary operator expected
SSH is NOT running
port.sh: line 35: [: netstat -an|grep LISTEN|grep :25: unary operator expected
sendmail have some problem of your pop3

li2002

注意!=前后都要有空格
还有注意单引号和`（tab键上面的那个)的区别

beyond911

原帖由 li2002 于 2007-6-17 09:23 发表
注意!=前后都要有空格
还有注意单引号和`（tab键上面的那个)的区别

谢谢，此问题已经解决！