| 1 | #!/bin/sh
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| 2 | BLUE="\033[34m"
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| 3 | RED="\033[31m"
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| 4 | GREEN="\033[32m"
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| 5 | RESET="\033[0m"
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| 6 |
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| 7 | pause() {
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| 8 | printf "$1"
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| 9 | read user_input
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| 10 | echo ""
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| 11 | }
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| 12 |
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| 13 | pause "Welcome to Shelllings [press ENTER]"
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| 14 |
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| 15 | echo "This program is meant to help you understand most posix shells,"
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| 16 | echo "like bash or zsh. You already ran the command 'sh run_shell.sh'"
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| 17 | echo "but the command 'sh' doesn't really exist on most systems."
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| 18 | echo "Run 'ls -l /bin/sh' to see if there is a link to another program."
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| 19 | pause "Let's test it out [press ENTER for ls -l /bin/sh]"
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| 20 |
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| 21 | printf "${BLUE}$(ls -l /bin/sh)${RESET}"
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| 22 | echo ""
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| 23 |
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| 24 | USER_SHELL=$(ls -l /bin/sh | awk '{print $NF}')
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| 25 |
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| 26 | echo ""
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| 27 | if [ "$USER_SHELL" = "sh" ]; then
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| 28 | echo "Looks like you are actually using sh, not everyone has it"
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| 29 | printf "like this. Many shells are changed. "
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| 30 | else
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| 31 | echo "From the command above, we can see that you are actually"
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| 32 | printf "running ${BLUE}$USER_SHELL${RESET} under the hood. "
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| 33 | fi
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| 34 |
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| 35 | echo "Bash is switched to a "
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| 36 | echo "POSIX-compatible mode, dash also only implements POSIX features."
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| 37 | echo "There are many different shells but we will be sticking with"
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| 38 | echo "POSIX compliant programs and commands. Meaning just about"
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| 39 | echo "every shell you use will be able to understand and run these"
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| 40 | echo "commands. This will not always be the case, however."
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| 41 | pause "[press ENTER]"
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| 42 |
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| 43 | printf "The LICENSE file is going to be used often later, ${RED}don't\n"
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| 44 | printf "remove the LICENSE file${RESET}. Thanks."
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| 45 | pause ""
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| 46 |
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| 47 | echo "To use the program shelllings, let's run the command"
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| 48 | echo "'sh shelllings.sh test' to see if it's able to be run"
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| 49 | pause "[sh shelllings.sh test]"
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| 50 |
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| 51 | if sh shelllings.sh test; then
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| 52 | printf "${GREEN}Passed${RESET}"
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| 53 | echo ""
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| 54 | else
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| 55 | printf "${RED}ERROR failed${RESET}"
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| 56 | echo ""
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| 57 | exit 1
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| 58 | fi
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| 59 |
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| 60 | echo ""
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| 61 | echo "No error message meant that it has not failed. Lets continue on"
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| 62 | pause "and see what exercises there are right now [ls exercises]"
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| 63 |
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| 64 | all_ex=$(ls exercises)
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| 65 | printf "${BLUE}$all_ex${RESET}"
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| 66 | echo ""
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| 67 |
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| 68 | echo ""
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| 69 | pause "[press ENTER]"
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| 70 |
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| 71 | amount=$(ls exercises | wc -l)
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| 72 |
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| 73 | echo "Looks like there are $amount exercises. You should know that"
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| 74 | echo "you can skip through the ones you already know or come back to"
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| 75 | echo "ones you already did. You can run 'sh shelllings.sh n' where n"
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| 76 | echo "is the numbered exercise. You don't need to type the 0's in"
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| 77 | echo "front. Let's get started with the first exercise"
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| 78 | pause "[sh shelllings.sh 1]"
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| 79 |
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| 80 | sh shelllings.sh 1 || {
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| 81 | echo "Looks like it failed. Go on over to the exercises/ folder and"
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| 82 | printf "fix it then run ${GREEN}sh shelllings 1${RESET} again.\n"
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| 83 | }
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