当前位置: 技术问答>linux和unix
判断字符串是否为空，请问为啥结果不一样
来源: 互联网 发布时间：2016-10-18
本文导语: #!/bin/bash tmp=`ps -ef|grep abcd|grep -v grep|awk '{print $2}'` if [ -n $tmp ] then echo "tmp is not null" else echo "tmp is null" fi if [ -z "$tmp" ] then echo "tmp is null" fi if [ $tmp="" ] then echo "tmp is null" fi if [ $tmp!="" ] then echo "tmp is ...
#!/bin/bash
tmp=`ps -ef|grep abcd|grep -v grep|awk '{print $2}'`
if [ -n $tmp ]
then
echo "tmp is not null"
else
echo "tmp is null"
fi
if [ -z "$tmp" ]
then
echo "tmp is null"
fi
if [ $tmp="" ]
then
echo "tmp is null"
fi
if [ $tmp!="" ]
then
echo "tmp is not null"
fi
|
#!/bin/bash
tmp=`ps -ef|grep abcd|grep -v grep|awk '{print $2}'`
if [ -n "$tmp" ]
then
echo "tmp is not null"
else
echo "tmp is null"
fi
if [ -z "$tmp" ]
then
echo "tmp is null"
fi
if [[ $tmp = "" ]]
then
echo "tmp is null"
fi
if [[ $tmp != "" ]]
then
echo "tmp is not null"
fi
|
if [ $tmp!="" ]
应该是
if ［[ $tmp!="" ]］
您可能感兴趣的文章:
本站(WWW.)旨在分享和传播互联网科技相关的资讯和技术，将尽最大努力为读者提供更好的信息聚合和浏览方式。
本站(WWW.)站内文章除注明原创外，均为转载、整理或搜集自网络。欢迎任何形式的转载，转载请注明出处。
本站(WWW.)站内文章除注明原创外，均为转载、整理或搜集自网络。欢迎任何形式的转载，转载请注明出处。