Question

获取以下shell脚本的语法错误。无法弄清问题所在。请帮帮我们。在此先感谢。

代码：

#!/bin/bash

# Check if package sensors (for Ubuntu) is installed, if not install it
dpkg -l | grep -i sensors > /dev/null

if [ "$?" == "0" ]; then
  echo "Package sensors already installed on system. Analyzing temperature!"
else
  sudo apt-get install sensors && echo "Package sensors now installed"
fi

# Set threshold temperature
threshold="+80.0°C"

# Check if temp has reached threshold, trigger mail
tempnow=$(sensors | sed -n '20p' | awk '{print $NF}')

res=`echo "$tempnow $threshold" | awk '{ if($1 > $2) print "Exceeds"; else print "Normal" }'`

if [ "$res" == "Exceeds" ]
then
  echo "Temperature exceeds threshold. Triggering mail to system owners..."
  mail -s "CPU temperature too high on system" abc@xyz.com
elif [ "$res" == "Normal" ]
  echo "Temperature under limit. Ignoring countermeasures!"
else
  echo "Unable to determine value"
fi

输出：

Package sensors already installed on system. Analyzing temperature!
/home/luckee/scripts/cputemp.sh: line 26: syntax error near unexpected token `else'
/home/luckee/scripts/cputemp.sh: line 26: `else'

Answer 1

第24行：

24    elif [ "$res" == "Normal" ] 
25    then           # <------ Missing in your original code
26      echo "Temperature under limit. Ignoring countermeasures!"

使用shellcheck.net来调试此类微不足道的问题。

Answer 2

then行之后需要额外的elif：

#!/bin/bash

# Check if package sensors (for Ubuntu) is installed, if not install it
dpkg -l | grep -i sensors > /dev/null

if [ "$?" == "0" ]; then
  echo "Package sensors already installed on system. Analyzing temperature!"
else
  sudo apt-get install sensors && echo "Package sensors now installed"
fi

# Set threshold temperature
threshold="+80.0°C"

# Check if temp has reached threshold, trigger mail
tempnow=$(sensors | sed -n '20p' | awk '{print $NF}')

res=`echo "$tempnow $threshold" | awk '{ if($1 > $2) print "Exceeds"; else print "Normal" }'`

if [ "$res" == "Exceeds" ]
then
  echo "Temperature exceeds threshold. Triggering mail to system owners..."
  mail -s "CPU temperature too high on system" abc@xyz.com
elif [ "$res" == "Normal" ]
then  # <== HERE!
  echo "Temperature under limit. Ignoring countermeasures!"
else
  echo "Unable to determine value"
fi

在shell脚本中获取else的语法错误

2 个答案: