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104 lines
2.8 KiB
104 lines
2.8 KiB
2 years ago
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#!/bin/bash
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# Spell cast successfully!
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# This spell will teach you about best practices for making UNIX scripts and command line utilities usable
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# One important aspect of script usability is providing clear and concise usage instructions.
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# You can do this by adding a usage function or a help flag, such as `-h` or `--help`.
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usage() {
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echo "Usage: $0 [-h] [-v] [-f file] arg1 arg2"
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}
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while getopts "hvf:" opt; do
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case ${opt} in
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h )
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usage
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exit 0
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;;
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v )
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echo "Verbose mode on"
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;;
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f )
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file="$OPTARG"
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;;
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\? )
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usage
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exit 1
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;;
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esac
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done
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shift $((OPTIND -1))
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# Another aspect of usability is providing clear and informative error messages.
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# This can help users quickly understand what went wrong and how to fix it.
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if [[ -z $1 ]]; then
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echo "Error: missing required argument arg1"
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usage
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exit 1
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fi
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if [[ ! -f $file ]]; then
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echo "Error: $file is not a valid file"
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exit 1
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fi
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# You can also improve usability by providing a consistent interface and adhering to conventions.
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# For example, using long options with a double dash, like `--help` is more user-friendly than using short options with a single dash like `-h`.
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echo "arg1: $1"
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echo "arg2: $2"
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echo "file: $file"
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# Additionally, providing tab-completion options for your script can greatly enhance usability.
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# Lastly, testing your script with different inputs and edge cases can help ensure it is robust and usable for a wide range of users.
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# Spell cast successfully!
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#!/bin/bash
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# The Very Usable, the most usable script
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# By studying this spell, your scripts shall be top-notch and fleet
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# With usage and help options, your users shall never be lost
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# And clear error messages, at any cost
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# First, let's add usage and help flags
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while getopts ":h" opt; do
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case $opt in
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h)
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echo "Usage: $(basename $0) [-h] [arguments]"
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echo "This is a highly usable script that demonstrates best practices for making unix scripts and command line utilities usable."
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exit 0
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;;
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\?)
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echo "Invalid option: -$OPTARG" >&2
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exit 1
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;;
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esac
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done
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# Now let's add some actions for the script
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if [ $# -eq 0 ]; then
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echo "No arguments provided. Use -h flag for help." >&2
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exit 1
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else
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echo "Performing actions with provided arguments: $@"
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fi
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# Let's make sure our script exits with appropriate status codes
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exit_status=0
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# And let's add some error handling
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error_message="Error: unknown error"
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trap 'echo $error_message; exit $exit_status' ERR
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# Now, let's add some actions that may fail
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false # this command always exits with status 1
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# Let's update our error message and exit status before exiting
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error_message="Error: false command failed"
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exit_status=1
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# The Very Usable spell has been cast successfully
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