How do I get the output of a shell command executed using into a variable from Jenkinsfile groovy

Question

I have something like this on a Jenkinsfile  Groovy  and I want to record the stdout and the exit code in a variable in order to use the information later    sh  ls -l    How can I do this  especially as it seems that you cannot really run any kind of groovy code inside the Jenkinsfile

User · Answer

quick answer is this   sh  ls -l  gt  commandResult  result   readFile  commandResult   trim     I think there exist a feature request to be able to get the result of sh step  but as far as I know  currently there is no other option   EDIT  JENKINS-26133  EDIT2  Not quite sure since what version  but sh bat steps now can return the std output  simply   def output   sh returnStdout  true  script   ls -l

User · Answer

this is a sample case  which will make sense I believe   node  master        stage  stage1        def commit   sh  returnStdout  true  script     echo hi     echo bye   grep -o  e      date     echo lol     split         echo    commit -1

User · Answer

For those who need to use the output in subsequent shell commands  rather than groovy  something like this example could be done       stage  Show Files             environment             MY FILES   sh script   cd mydir  amp  amp  ls -l   returnStdout  true                    steps             sh                 echo   MY FILES                                  I found the examples on code maven to be quite useful

User · Answer

If you want to get the stdout AND know whether the command succeeded or not  just use returnStdout and wrap it in an exception handler   scripted pipeline  try          Fails with non-zero exit if dir1 does not exist     def dir1   sh script  ls -la dir1   returnStdout true  trim     catch  Exception ex        println  Unable to read dir1    ex        output    Pipeline  sh  Test-Pipeline  Running shell script   ls -la dir1 ls  cannot access dir1  No such file or directory  Pipeline  echo unable to read dir1  hudson AbortException  script returned exit code 2   Unfortunately hudson AbortException is missing any useful method to obtain that exit status  so if the actual value is required you d need to parse it out of the message  ugh    Contrary to the Javadoc https   javadoc jenkins-ci org hudson AbortException html the build is not failed when this exception is caught   It fails when it s not caught   Update  If you also want the STDERR output from the shell command  Jenkins unfortunately fails to properly support that common use-case   A 2017 ticket JENKINS-44930 is stuck in a state of opinionated ping-pong whilst making no progress towards a solution - please consider adding your upvote to it   As to a solution now  there could be a couple of possible approaches   a  Redirect STDERR to STDOUT 2 gt  amp 1   - but it s then up to you to parse that out of the main output though  and you won t get the output if the command failed - because you re in the exception handler   b  redirect STDERR to a temporary file  the name of which you prepare earlier  2 gt filename  but remember to clean up the file afterwards  - ie  main code becomes   def stderrfile    stderr out  try       def dir1   sh script  ls -la dir1 2 gt   stderrfile    returnStdout true  trim     catch  Exception ex        def errmsg   readFile stderrfile      println  Unable to read dir1    ex  -   errmsg        c  Go the other way  set returnStatus true instead  dispense with the exception handler and always capture output to a file  ie   def outfile    stdout out  def status   sh script  ls -la dir1  gt   outfile  2 gt  amp 1   returnStatus true  def output   readFile outfile  trim   if  status    0           output is directory listing from stdout   else          output is error message from stderr     Caveat  the above code is Unix Linux-specific - Windows requires completely different shell commands

User · Answer

How to read the  shell variable in groovy   how to assign shell return value to groovy variable  Requirement   Open a text file read the lines  using shell and store the value in groovy  and get the parameter for each line   Here   is delimiter Ex  releaseModule txt   APP TSBASE app team i-home deployments ip-cc war cs workflowReport jar configurable-wf-report 94 23crb1 artifact      APP TSBASE app team i-home deployments ip war cs workflowReport jar configurable-temppweb-report 394 rvu3crb1 artifact                           Here want to get  module name 2nd Parameter  configurable-wf-report     build no 3rd  Parameter  94   commit id 4th  23crb1  def  module   sh script   quot  quot  quot awk -F       print   2  quot   quot    3  quot   quot    4    releaseModules txt    sort -u  quot  quot  quot   returnStdout  true  trim    echo module  List lines   module split    n    findAll    it startsWith           def buildid  def Modname  lines each    List det1    it split       buildid det1 1  trim     Modname   det1 0  trim    tag  det1 2  trim                     echo Modname                 echo buildid                  echo tag

User · Answer

All the above method will work  but to use the var as env variable inside your code you need to export the var first  script    sh  quot   shell command here   gt  command quot    command var   readFile  command   trim     sh  quot export command var  command var quot     replace the shell command with the command of your choice  Now if you are using python code you can just specify os getenv  quot command var quot   that will return the output of the shell command executed previously

User · Answer

Easiest way is use this way  my var  echo 2  echo  my var  output   2  note that is not simple single quote is back quote

User · Answer

The latest version of the pipeline sh step allows you to do the following     Git committer email GIT COMMIT EMAIL   sh       script   git --no-pager show -s --format    ae         returnStdout  true   trim   echo  quot Git committer email    GIT COMMIT EMAIL  quot   Another feature is the returnStatus option     Test commit message for flags BUILD FULL   sh       script   quot git log -1 --pretty  B   grep     jenkins-full   quot       returnStatus  true      0 echo  quot Build full flag    BUILD FULL  quot   These options where added based on this issue  See official documentation for the sh command  For declarative pipelines  see comments   you need to wrap code into script step  script      GIT COMMIT EMAIL   sh           script   git --no-pager show -s --format    ae             returnStdout  true       trim       echo  quot Git committer email    GIT COMMIT EMAIL  quot

User · Answer

Current Pipeline version natively supports returnStdout and returnStatus  which make it possible to get output or status from sh bat steps   An example   def ret   sh script   uname   returnStdout  true  println ret   An official documentation

[groovy] How do I get the output of a shell command executed using into a variable from Jenkinsfile (groovy)?

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