How to pass variables from Jenkinsfile to shell command

Joe:

I would like to use a variable inside a Jenkinsfilescript and then pass its value to shell script execution (either as an environment variable or command line argument).

But the following Jenkinsfile:

for (i in [ 'a', 'b', 'c' ]) {
    echo i
    sh 'echo "from shell i=$i"'
}

gives the output:

a
from shell i=
b
from shell i=
c
from shell i=

The desired output is similar to:

a
from shell i=a
b
from shell i=b
c
from shell i=c

Any idea how to pass the value ito shell scipt?

EDIT: Based on Matt's answer, I now use this solution:

for (i in [ 'a', 'b', 'c' ]) {
    echo i
    sh "i=${i}; " + 'echo "from shell i=$i"'
}

The advantage is that I don't need escaping "in the shell script .

Matt Schuchard:

Your code uses literal strings, so your Jenkins variables will not be interpolated in shell commands. You need to use "to interpolate variables in the string sh. 'Only literal strings will be passed. So we need to make some changes here.

The first is 'to change to ":

for (i in [ 'a', 'b', 'c' ]) {
  echo i
  sh "echo "from shell i=$i""
}

However, now we need to escape "internally :

for (i in [ 'a', 'b', 'c' ]) {
  echo i
  sh "echo \"from shell i=$i\""
}

Also, if we append the variable directly to the string like we did above ( $iabove i=) , we need to close it with curly braces:

for (i in [ 'a', 'b', 'c' ]) {
  echo i
  sh "echo \"from shell i=${i}\""
}

This will get you the desired behavior.

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