# ----------------------------------------------------------------------------
# How to check if a string begins with some value in bash
#
# more cool examples here:  https://www.cyberciti.biz/faq/bash-check-if-string-starts-with-character-such-as/
# ----------------------------------------------------------------------------
#
# Let us define a shell variable called vech as follows:
vech="Bus"

# To check if string “Bus” stored in $vech starts with “B”, run:
[[ $vech = B* ]] && echo "Start with B"

# The [[ used to execute the conditional command. It checks if $vech starts with “B” followed by any character. Set vech to something else and try it again:
vech="Car"
[[ $vech = B* ]] && echo "Start with B"
[[ $vech = B* ]] && echo "Start with B" || echo "Not matched"

# longer version with if
input="xBus"
 
if [[ $input = B* ]]
then
	echo "Start with B"
else
	echo "No match"
fi

# ----------------------------------------------------------------------------
# Check number of arguments passed to a Bash script
#
# https://stackoverflow.com/questions/18568706/check-number-of-arguments-passed-to-a-bash-script
# ----------------------------------------------------------------------------

if [ "$#" -ne 1 ]; then
    echo "Illegal number of parameters"
fi
# Or

if test "$#" -ne 1; then
    echo "Illegal number of parameters"
fi