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|Learning to program||1||86|
|How to understand this line:"if [ -z "`echo $usernam`" -o "`echo $usernam`" = "root" -o "`echo $usernam`" = "sa" ]"||13||105|
|pipe to sed or perl, please help||5||110|
|Formatting stings with pack and printf in perl||5||37|
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