shell脚本报错："[: =: unary operator expected"
2014-07-22 20:15
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shell脚本报错："[: =: unary operator expected"
md5_109a="81ab961153b62d207f0f517048881b5d"
md5_109b=`md5sum install.bin|awk '{print $1}'`
if [ $md5_109a != $md5_109b ]
原因，当文件install.bin不存在时， $md5_109b为空这样对比字符串就变成了
if [ 81ab961153b62d207f0f517048881b5d ！= ] 显然语句就不合法了
可以改成
if [[ $md5_109a != $md5_109b ]]
或者 if [ “$md5_109a ”a != “$md5_109b”a ]
问题解决
本文出自 “tonylinux” 博客，请务必保留此出处http://tonylinux.blog.51cto.com/2268300/1441515
md5_109a="81ab961153b62d207f0f517048881b5d"
md5_109b=`md5sum install.bin|awk '{print $1}'`
if [ $md5_109a != $md5_109b ]
原因，当文件install.bin不存在时， $md5_109b为空这样对比字符串就变成了
if [ 81ab961153b62d207f0f517048881b5d ！= ] 显然语句就不合法了
可以改成
if [[ $md5_109a != $md5_109b ]]
或者 if [ “$md5_109a ”a != “$md5_109b”a ]
问题解决
本文出自 “tonylinux” 博客，请务必保留此出处http://tonylinux.blog.51cto.com/2268300/1441515
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