我有以下文本可替换For More Question Papers - Join Youtube " somechannel"为无。我使用以下命令失败了。
sed -r -e "s/For More Question Papers - Join Youtube \" somechannel\"/ /" ldcq.pdf > unwatermarked.pdf
sed -e "s/For More Question Papers - Join Youtube \" somechannel\"/ /" ldcq.pdf > unwatermarked.pdf
sed -e 's/For More Question Papers - Join Youtube " somechannel"/ /' ldcq.pdf > unwatermarked.pdf
sed -e "s/For More Question Papers - Join Youtube " somechannel"/ /" ldcq.pdf > unwatermarked.pdf
任何修复表示赞赏。