I am trying to create some useful aliases for myself and am trying to find a way see the current Kubernetes context namespace.
k config get-contexts
CURRENT NAME CLUSTER AUTHINFO NAMESPACE
* kubernetes-test@kubernetes2 kubernetes2 kubernetes-test test
kubernetes-admin@kubernetes kubernetes kubernetes-admin defaultI only want the output to be 'test', so I tried:
k config get-contexts | awk '/*/{print $5}'The error it gets:
awk: line 1: regular expression compile failed (missing operand)You're getting that error message because * is a regexp repetition metachar and as such using it as the first char in a regexp is undefined behavior since there's nothing preceding it to repeat. You're also using a partial line regexp match when what you apparently want is a full word string match (see https://stackoverflow.com/questions/65621325/how-do-i-find-the-text-that-matches-a-pattern for the difference):
k config get-contexts | awk '$1=="*"{ print $5 }'First of all, * in regex is a quantifier that means "zero or more occurrences". Since it is a regex metacharacter, it should be escaped, \*:
k config get-contexts | awk '/\*/{print $5}'However, since you are looking for a fixed string rather than a pattern you can use index:
k config get-contexts | awk 'index($0, "*") {print $5}'If * is found anywhere inside a "record" (the line) the fifth field will get printed.