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improve messaging for the wrong usage #4

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improve messaging for the wrong usage #4

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34 changes: 34 additions & 0 deletions ch
100644 → 100755
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,31 @@
# catch uninitialized variables
set -u


# display basic usage information
display_basic_usage ()
{
echo "Usage: $0 <command> [options]"
echo "Try '$0 --help' for more information."
}


# display detailed usage information
display_detailed_usage ()
{
echo "Usage: $0 <command> [options]"
echo "Extract help information for a given command and its options."
echo
echo "Options:"
echo " --help Show this help message and exit."
echo
echo "Examples:"
echo " $0 ls --help"
echo " $0 grep --invert-match"
exit 0
}


###############################################
# extract from line starting with search word
# upto newline or line starting with -
Expand All @@ -24,6 +49,15 @@ extract_text ()
}


# Check for help option or no arguments
if [[ "$#" -eq 0 ]]; then
display_basic_usage
exit 1
elif [[ "$1" == "--help" ]]; then
display_detailed_usage
fi


###############################################
# variable to save command name
# shift, for rest of arguments to be looped
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