Learning the bash Shell 3rd Edition
ThefirstthingusersoftheUNIXorLinuxoperatingsystemscomefacetofacewithistheshell."Shell"istheUNIXtermforauserinterfacetothesystem—somethingthatletsyoucommunicatewiththecomputerviathekeyboardandthedisplay.Shellsarejustseparateprogramsthatencapsulatethe
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