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I am looking for a conditional to avoid users from leaving an input value blank. Any suggestions?
742
To find out if a bash variable is empty: Return true if a bash variable is unset or set to the empty string: if [ -z "$var" ]; Another option: [ -z "$var" ] && echo "Empty" Determine if a bash variable is empty: [[ ! -z "$var" ]] && echo "Not empty" || echo "Empty"
To check if string is empty in Bash, we can make an equality check with the given string and empty string using string equal-to = operator, or use -z string operator to check if the size of given string operand is zero.
If the $0 special variable is used within a Bash script, it can be used to print its name and if it is used directly within the terminal, it can be used to display the name of the current shell.
unset input
while [ -z ${input} ]; do
read input
done
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