[:: : bash 脚本上的错误数字
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[: : bad number on the bash script
提问by Cyclone
This is my bash script:
这是我的 bash 脚本：
#!/usr/local/bin/bash -x
touch /usr/local/p
touch /usr/local/rec
DATA_FULL=`date +%Y.%m.%d.%H`
CHECK=`netstat -an | grep ESTAB | egrep '(13001|13002|13003|13004|13061|13099|16001|16002|16003|16004|16061|16099|18001|18002|18003|18004|18061|18099|20001|20002|20003|20004|20061|20099|13000|16000|18000|20000)' | awk '{ print }' | sort -u | wc -l`
netstat -an | grep ESTAB | egrep '(13001|13002|13003|13004|13061|13099|16001|16002|16003|16004|16061|16099|18001|18002|18003|18004|18061|18099|20001|20002|20003|20004|20061|20099|13000|16000|18000|20000)' | awk '{ print }' | sort -u | wc -l > /usr/local/www/p
STAT=`cat /usr/local/www/rec`
if [ "$CHECK" -gt "$STAT" ]; then
echo $CHECK"\n"$DATA_FULL > /usr/local/p
fi
Ofcourse I've runned chmod +x script.shand then sh script.sh, then I receive the following message: [: : bad number.
Ofcourse我跑了chmod +x script.sh然后sh script.sh，然后我收到以下消息：[: : bad number。
Why does it happends?
为什么会发生？
回答by Uday
Run your script using
使用运行你的脚本
sh -x script.sh
It'll print every line it executes and the variable output. Run the netstat command and stat command outside and check.
它将打印它执行的每一行和变量输出。在外面运行netstat命令和stat命令并检查。
回答by Shiplu Mokaddim
If these are integer for sure, use this syntax,
如果这些肯定是整数，请使用此语法，
if [ "0$(echo $CHECK|tr -d ' ')" -gt "0$(echo $STAT|tr -d ' ')" ];
A simple hack. Only works if $STAT is always either empty or positive number.
一个简单的黑客。仅当 $STAT 始终为空或正数时才有效。
回答by Michael Krelin - hacker
probably your /usr/local/www/recis empty. Try
可能你/usr/local/www/rec是空的。尝试
STAT=`cat /usr/local/www/rec 2>/dev/null || echo 0`
maybe.
也许。
回答by Michael Krelin - hacker
Are you sure that both STATand CHECKare numbers that can be compared with -gt?
您确定STAT和CHECK都是可以与 进行比较的数字-gt吗？
