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test:tldr:d755c
test: Test if a given variable is empty.
$ test -z "${$GIT_BRANCH}"
try on your machine
This command checks if the value of the environment variable "GIT_BRANCH" is an empty string or not. Here is the breakdown of the command:
test
is a command used in Unix-like operating systems to perform tests and evaluations.-z
is a test operator used with thetest
command to check if a string is empty."${$GIT_BRANCH}"
is the variable being checked. The syntax${VAR_NAME}
is used to access the value of a variable. In this case, the variable being checked isGIT_BRANCH
. However, the use of "$" before$GIT_BRANCH
is incorrect syntax. It should be either"${GIT_BRANCH}"
or just$GIT_BRANCH
.
So, when this command is executed, it checks if the value of the GIT_BRANCH
variable is an empty string. If it is empty, the command returns a true or "0" exit status. If it is not empty, the command returns a false or non-zero exit status.
This explanation was created by an AI. In most cases those are correct. But please always be careful and
never run a command you are not sure if it is safe.