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This Stack Overflow answer was the only one to trap space and dash chars:

# For null cmd arguments checking 
to_check=' -t'
space_n_dash_chars=' -'
[[ $to_check == *"$space_n_dash_chars"* ]] && echo found

This Stack Overflow answer was the only one to trap space and dash characters:

# For null cmd arguments checking 
to_check=' -t'
space_n_dash_chars=' -'
[[ $to_check == *"$space_n_dash_chars"* ]] && echo found

This Stack Overflow answer was the only one to trap space and dash chars:

# For null cmd arguments checking 
to_check=' -t'
space_n_dash_chars=' -'
[[ $to_check == *"$space_n_dash_chars"* ]] && echo found

This Stack Overflow answer was the only one to trap space and dash chars:

# For null cmd arguments checking 
to_check=' -t'
space_n_dash_chars=' -'
[[ $to_check == *"$space_n_dash_chars"* ]] && echo found

This Stack Overflow answer was the only one to trap space and dash chars:

# For null cmd arguments checking 
export to_check=' -t'
export space_n_dash_chars=' -'
[[ $to_check == *"$space_n_dash_chars"* ]] && echo found

This Stack Overflow answer was the only one to trap space and dash chars:

# For null cmd arguments checking 
to_check=' -t'
space_n_dash_chars=' -'
[[ $to_check == *"$space_n_dash_chars"* ]] && echo found