Jenkins使用Groovy读取Jenkinsfile中文件的特定行

Question

I am trying to read a specific line of an html file in a Jenkins stage with Groovy and save its contents to an environment variable. The problem is, File and readLines() are not allowed.

I am able to load a file with

env.WORKSPACE = pwd()
def file = readFile "${env.WORKSPACE}/file.html"

Provided in this answer

But how can I access instantly to the contents of line n ? I am using Jenkins 2.32

Answer 1

I Tried the suggestion of tim_yates from the comments but System was also forbidden. What ultimately worked for me was just changing System.getProperty("line.separator") to new line character "\\n" .

So the full answer was in its simplicity:

file.split("\n")[n]

Answer 2

Just going to leave documented here, but you can also use readLines().

def file = readFile location
def lines = file.readLines()

From this other question