Bash Script Case statement (if not logic)












0















I wrote a small bash script, where it will try to find a word ERROR, if found resulting value will be non-zero variable numeric (for example, 25 I mentioned in the script but it is variable numeric value) and if not found, it will be 0.



My problem is, I want to use Case statement such as if output is not zero, only then execute this particular command 



truncate -s 0 /root/test/wayfile.log && screen -X -S wowow quit &


script here



#! /bin/bash



case "$(grep ERROR /root/test/wayfile.log | wc -w)" in



25)  echo "empty log file and kill screen: $(date)" >> /var/log/finderror.txt

    truncate -s 0 /root/test/wayfile.log && screen -X -S wowow quit &

;;

0)  # all ok

;;

esac





linux bash ubuntu scripting






share



























    0















    I wrote a small bash script, where it will try to find a word ERROR, if found resulting value will be non-zero variable numeric (for example, 25 I mentioned in the script but it is variable numeric value) and if not found, it will be 0.



    My problem is, I want to use Case statement such as if output is not zero, only then execute this particular command 



    truncate -s 0 /root/test/wayfile.log && screen -X -S wowow quit &


    script here



    #! /bin/bash
    

    
case "$(grep ERROR /root/test/wayfile.log | wc -w)" in
    

    
25)  echo "empty log file and kill screen: $(date)" >> /var/log/finderror.txt
    
    truncate -s 0 /root/test/wayfile.log && screen -X -S wowow quit &
    
;;
    
0)  # all ok
    
;;
    
esac





    linux bash ubuntu scripting






    share

























      0












      0








      0








      I wrote a small bash script, where it will try to find a word ERROR, if found resulting value will be non-zero variable numeric (for example, 25 I mentioned in the script but it is variable numeric value) and if not found, it will be 0.



      My problem is, I want to use Case statement such as if output is not zero, only then execute this particular command 



      truncate -s 0 /root/test/wayfile.log && screen -X -S wowow quit &


      script here



      #! /bin/bash
      

      
case "$(grep ERROR /root/test/wayfile.log | wc -w)" in
      

      
25)  echo "empty log file and kill screen: $(date)" >> /var/log/finderror.txt
      
    truncate -s 0 /root/test/wayfile.log && screen -X -S wowow quit &
      
;;
      
0)  # all ok
      
;;
      
esac





      linux bash ubuntu scripting






      share














      I wrote a small bash script, where it will try to find a word ERROR, if found resulting value will be non-zero variable numeric (for example, 25 I mentioned in the script but it is variable numeric value) and if not found, it will be 0.



      My problem is, I want to use Case statement such as if output is not zero, only then execute this particular command 



      truncate -s 0 /root/test/wayfile.log && screen -X -S wowow quit &


      script here



      #! /bin/bash
      

      
case "$(grep ERROR /root/test/wayfile.log | wc -w)" in
      

      
25)  echo "empty log file and kill screen: $(date)" >> /var/log/finderror.txt
      
    truncate -s 0 /root/test/wayfile.log && screen -X -S wowow quit &
      
;;
      
0)  # all ok
      
;;
      
esac





      linux bash ubuntu scripting




      linux bash ubuntu scripting





      share












      share










      share



      share










      asked 9 mins ago









      CryptoMiningPoolSetupYiimpCryptoMiningPoolSetupYiimp

      1033




      1033






















          0






          active

          oldest

          votes











          Your Answer








          StackExchange.ready(function() {
          var channelOptions = {
          tags: "".split(" "),
          id: "106"
          };
          initTagRenderer("".split(" "), "".split(" "), channelOptions);

          StackExchange.using("externalEditor", function() {
          // Have to fire editor after snippets, if snippets enabled
          if (StackExchange.settings.snippets.snippetsEnabled) {
          StackExchange.using("snippets", function() {
          createEditor();
          });
          }
          else {
          createEditor();
          }
          });

          function createEditor() {
          StackExchange.prepareEditor({
          heartbeatType: 'answer',
          autoActivateHeartbeat: false,
          convertImagesToLinks: false,
          noModals: true,
          showLowRepImageUploadWarning: true,
          reputationToPostImages: null,
          bindNavPrevention: true,
          postfix: "",
          imageUploader: {
          brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
          contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
          allowUrls: true
          },
          onDemand: true,
          discardSelector: ".discard-answer"
          ,immediatelyShowMarkdownHelp:true
          });


          }
          });














          draft saved

          draft discarded


















          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f505282%2fbash-script-case-statement-if-not-logic%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown

























          0






          active

          oldest

          votes








          0






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes
















          draft saved

          draft discarded




















































          Thanks for contributing an answer to Unix & Linux Stack Exchange!


          • Please be sure to answer the question. Provide details and share your research!

          But avoid …



          • Asking for help, clarification, or responding to other answers.

          • Making statements based on opinion; back them up with references or personal experience.


          To learn more, see our tips on writing great answers.




          draft saved


          draft discarded














          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f505282%2fbash-script-case-statement-if-not-logic%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown





















































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown

































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown







          -

          Popular posts from this blog

          Accessing regular linux commands in Huawei's Dopra Linux

          Image
          4 Backstory: I have a Huawei HG8245 router in my house and I want to change the default username/password. I've tried following this guide but the config file always gets reset. My ISP isn't helping either so I'm looking for other ways to accomplish this. The router has telnet access so this seems like a way to change the credentials. The first shell I gain access to looks like this: WAP> Pressing "?" gives me a list of available commands which I've pasted here, the two interesting ones are "su" and "shell". I can't seem to get su access, even after logging in as root (challenge password prompt, and then nothing happens), but shell gives me a proper linux shell. WAP>shell BusyBox v1.18.4 (2017-12-26 17:06:34 CST) built-in shell (ash) Enter 'hel...
          Read more

          Can't connect RFCOMM socket: Host is down

          Image
          up vote 3 down vote favorite I have bluez 5.4.3 and I am attempting to communicate with a ble device through minicom. These two deceives (my computer and a bluno nano) are alreadt paired and this has been my method so far. #bluetoothctl # pair xx:xx:xx:xx:xx:xx # exit Everything is working well so far then... #sudo rfcomm connect /dev/rfcomm0 xx:xx:xx:xx:xx:xx 1 & [1] 3665 Can't connect RFCOMM socket: Host is down Does anyone know how to resolve this issue? Any help would be very much appreciated. bluetooth bluez share | improve this question asked Feb 9 '17 at 18:46 Brandon Knape 46 2 ...
          Read more

          Kernel panic - not syncing: Fatal Exception in Interrupt

          Image
          0 Every day this error occured on my pc, kernel panic error on interrupt, what will be the problem? linux-mint share asked 6 mins ago Vinod Selvin Vinod Selvin 1 1 New contributor Vinod Selvin is a new contributor to this site. Take care in asking for clarification, commenting, and answering. Check out our Code of Conduct. add a comment ...
          Read more