How to check if a variable is set in Bash?
How do I know if a variable is set in Bash?
For example, how do I check if the user gave the first parameter to a function?
function a {
# if $1 is set ?
}
How do I know if a variable is set in Bash?
For example, how do I check if the user gave the first parameter to a function?
function a {
# if $1 is set ?
}