| 1 | #!/bin/sh
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| 2 |
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| 3 | # There are many times where you would need to repeat large sections of
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| 4 | # code. Or need to simplify the code for readability and organization.
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| 5 | # Functions would be use in this case, this is a simple example of how
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| 6 | # to use a function.
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| 7 | #
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| 8 | # $ greet() {
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| 9 | # $ name="$1"
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| 10 | # $ echo "Hello, $name."
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| 11 | # $ }
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| 12 | # $
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| 13 | # $ greet Alice # Hello, Alice.
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| 14 | # $ greet Bob # Hello, Bob.
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| 15 | #
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| 16 | # Pay attention to the syntax to use this function.
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| 17 | #
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| 18 | # Fix this program
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| 19 |
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| 20 | display_entropy() {
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| 21 | echo "Entropy available: $(cat /proc/sys/kernel/random/entropy_avail)"
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| 22 | echo "Entropy pool size: $(cat /proc/sys/kernel/random/poolsize)"
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| 23 | echo "Wakeup threshold: $(cat /proc/sys/kernel/random/write_wakeup_threshold)"
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| 24 | echo "Minimum reseeding in seconds: $(cat /proc/sys/kernel/random/urandom_min_reseed_secs)"
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| 25 | }
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| 26 |
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| 27 | help() {
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| 28 | echo "Usage: sh 19_functions.sh [OPTION]"
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| 29 | echo "-en displays the entropy information of your system"
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| 30 | echo "-h, --help displays this help message"
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| 31 | }
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| 32 |
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| 33 | # Write a program where if something runs the program with the option
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| 34 | # '-de' at the end (sh 19_functions.sh -de) it would call the
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| 35 | # display_entropy function. Anything else written, would have the help
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| 36 | # function ran.
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| 37 |
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