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shidandan123

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[求助] -bash: conditional binary operator expected

请大家帮我看看,我是新手说明书上要执行下面的命令
To compute the derivatives of the electric transition dipole, execute the following Linux commands (enclosed by the parentheses [ and ])
2 [ grep -An "electric dipole" Gaussian-output > temp ] (where the state
of interest is n-1, i.e. for ˉrst excited state "-A2"
2 [ grep -v "electric dipolenjstatenj- -" temp > el-dipoles ]
我执行了就出错了
[hou@localhost sdd]$ [[ grep-A2 "electric dipole" hh.log > temp ] and [ grep -v "electric dipole\|state\|--" temp > el-dipoles ]]
-bash: conditional binary operator expected
-bash: syntax error near `dipole"'
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