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Explain what semaphores are, their usage, implementation given to avoid busy waiting and binary semaphores.
Semaphore definition
Usage for mutual exclusion and process synchronization
Implementation to avoid spinlock using block and wakeup
Binary semaphores
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write a linux command to display lines from 25 - 45 of directory "/edc/password" write a linux command to display directory in /edc
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shell program for Armstrong number
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