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[求助]
-bash: conditional binary operator expected
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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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