How to access value of a jenkins groovy variable in shell script for loop - linux

Question

When i am passing value of a variable declared in jenkins Groovy script its value is not retained in for loop which is running on a remote server. Strange thing is i am able to access the same value outside the for loop.
Here is the sample code i am trying to use
#!/usr/bin/env groovy
def config
def COMMANDS_TO_CHECK='curl grep hello awk tr mkdir bc'
pipeline {
agent {
label "master"
}
stages {
stage ('Validation of commands') {
steps {
script {
sh """
#!/bin/bash
/usr/bin/sshpass -p passwrd ssh user#host << EOF
hostname
echo $COMMANDS_TO_CHECK ---> This is printed
for CURRENT_COMMAND in \$COMMANDS_TO_CHECK
do
echo ${CURRENT_COMMAND} ---> Why This is not printed?
echo \${CURRENT_COMMAND} ----> Why This is not printed?
done
hostname
EOF
exit
"""
}
}
}
}
}
Output
[workspace#3] Running shell script
+ /usr/bin/sshpass -p passwrd ssh user#host
Pseudo-terminal will not be allocated because stdin is not a terminal.
illinsduck01
curl grep hello awk tr mkdir bc
illinsduck01
+ exit

Answer 1

You can wrap sh in """ ... """ as below
#!/usr/bin/env groovy
def config
pipeline {
agent {
label "master"
}
stages {
stage ('Validation of commands') {
steps {
script {
sh """#!/bin/sh
/usr/bin/sshpass -p password ssh username#hostname << EOF
COMMANDS_TO_CHECK="curl grep hello awk tr mkdir bc"
hostname
echo \$COMMANDS_TO_CHECK
for CURRENT_COMMAND in \$COMMANDS_TO_CHECK
do
echo \$CURRENT_COMMAND
which \$CURRENT_COMMAND
status=\$?
if [ \${status} -eq 0 ]
then
echo \${CURRENT_COMMAND} command is OK
else
echo "Failed to find the \${CURRENT_COMMAND} command"
fi
done
hostname
EOF
exit
"""
}
}
}
}
}