Kill remote process via ssh

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0















I have a process that I want to kill remotely. I tried



ssh remotehost "kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')"


but this returns the error



kill: usage: kill [-s sigspec | -n signum | -sigspec] pid | jobspec ... or kill -l [sigspec]


However if I run the command within the quotation marks



kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')


on the remote host it works fine. Am I missing something here?










share|improve this question




























    0















    I have a process that I want to kill remotely. I tried



    ssh remotehost "kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')"


    but this returns the error



    kill: usage: kill [-s sigspec | -n signum | -sigspec] pid | jobspec ... or kill -l [sigspec]


    However if I run the command within the quotation marks



    kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')


    on the remote host it works fine. Am I missing something here?










    share|improve this question


























      0












      0








      0








      I have a process that I want to kill remotely. I tried



      ssh remotehost "kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')"


      but this returns the error



      kill: usage: kill [-s sigspec | -n signum | -sigspec] pid | jobspec ... or kill -l [sigspec]


      However if I run the command within the quotation marks



      kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')


      on the remote host it works fine. Am I missing something here?










      share|improve this question
















      I have a process that I want to kill remotely. I tried



      ssh remotehost "kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')"


      but this returns the error



      kill: usage: kill [-s sigspec | -n signum | -sigspec] pid | jobspec ... or kill -l [sigspec]


      However if I run the command within the quotation marks



      kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')


      on the remote host it works fine. Am I missing something here?







      ssh process quoting kill remote






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Jan 24 at 10:29









      Jeff Schaller

      41.3k1056131




      41.3k1056131










      asked Jan 24 at 6:15









      chrisechrise

      1313




      1313




















          1 Answer
          1






          active

          oldest

          votes


















          2














          The $(..) command substitution would fail as the $ is expanded by the local shell even before it is passed to the stdin of the ssh command. You either need to escape it or use here-strings.



          Also the command inside the awk that prints $2 gets interpolated as a command-line argument. So we escape it to defer its expansion until the command is executed remotely.



          With escaping,



          ssh remotehost "kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')"


          or with here-doc



          ssh remotehost <<'EOF'
          kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')
          EOF


          Also note that grep .. | grep .. | awk is superfluous. You can do the whole operation with awk alone. Or even better use pkill to get the process to kill directly by name.






          share|improve this answer

























          • ah, interesting. I thought it would ship the complete expression within the quotation marks just as it is. So the $ will be evaluated immediately?

            – chrise
            Jan 24 at 6:26











          • @chrise: In that case, it is preferred to use the second approach involving here-doc

            – Inian
            Jan 24 at 6:28











          • either way I try seems to not return. So if I run it from command line, it doesnt go back to the prompt. If I run it from a script it doesnt go to the next line. Do I need to somehow explicitly exit this?

            – chrise
            Jan 24 at 6:48











          • @chrise: You should use the here-docs carefully. There shouldn't be any leading spaces in the line after 'EOF', any leading spaces should be removed

            – Inian
            Jan 24 at 6:49










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          1 Answer
          1






          active

          oldest

          votes








          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          2














          The $(..) command substitution would fail as the $ is expanded by the local shell even before it is passed to the stdin of the ssh command. You either need to escape it or use here-strings.



          Also the command inside the awk that prints $2 gets interpolated as a command-line argument. So we escape it to defer its expansion until the command is executed remotely.



          With escaping,



          ssh remotehost "kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')"


          or with here-doc



          ssh remotehost <<'EOF'
          kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')
          EOF


          Also note that grep .. | grep .. | awk is superfluous. You can do the whole operation with awk alone. Or even better use pkill to get the process to kill directly by name.






          share|improve this answer

























          • ah, interesting. I thought it would ship the complete expression within the quotation marks just as it is. So the $ will be evaluated immediately?

            – chrise
            Jan 24 at 6:26











          • @chrise: In that case, it is preferred to use the second approach involving here-doc

            – Inian
            Jan 24 at 6:28











          • either way I try seems to not return. So if I run it from command line, it doesnt go back to the prompt. If I run it from a script it doesnt go to the next line. Do I need to somehow explicitly exit this?

            – chrise
            Jan 24 at 6:48











          • @chrise: You should use the here-docs carefully. There shouldn't be any leading spaces in the line after 'EOF', any leading spaces should be removed

            – Inian
            Jan 24 at 6:49















          2














          The $(..) command substitution would fail as the $ is expanded by the local shell even before it is passed to the stdin of the ssh command. You either need to escape it or use here-strings.



          Also the command inside the awk that prints $2 gets interpolated as a command-line argument. So we escape it to defer its expansion until the command is executed remotely.



          With escaping,



          ssh remotehost "kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')"


          or with here-doc



          ssh remotehost <<'EOF'
          kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')
          EOF


          Also note that grep .. | grep .. | awk is superfluous. You can do the whole operation with awk alone. Or even better use pkill to get the process to kill directly by name.






          share|improve this answer

























          • ah, interesting. I thought it would ship the complete expression within the quotation marks just as it is. So the $ will be evaluated immediately?

            – chrise
            Jan 24 at 6:26











          • @chrise: In that case, it is preferred to use the second approach involving here-doc

            – Inian
            Jan 24 at 6:28











          • either way I try seems to not return. So if I run it from command line, it doesnt go back to the prompt. If I run it from a script it doesnt go to the next line. Do I need to somehow explicitly exit this?

            – chrise
            Jan 24 at 6:48











          • @chrise: You should use the here-docs carefully. There shouldn't be any leading spaces in the line after 'EOF', any leading spaces should be removed

            – Inian
            Jan 24 at 6:49













          2












          2








          2







          The $(..) command substitution would fail as the $ is expanded by the local shell even before it is passed to the stdin of the ssh command. You either need to escape it or use here-strings.



          Also the command inside the awk that prints $2 gets interpolated as a command-line argument. So we escape it to defer its expansion until the command is executed remotely.



          With escaping,



          ssh remotehost "kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')"


          or with here-doc



          ssh remotehost <<'EOF'
          kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')
          EOF


          Also note that grep .. | grep .. | awk is superfluous. You can do the whole operation with awk alone. Or even better use pkill to get the process to kill directly by name.






          share|improve this answer















          The $(..) command substitution would fail as the $ is expanded by the local shell even before it is passed to the stdin of the ssh command. You either need to escape it or use here-strings.



          Also the command inside the awk that prints $2 gets interpolated as a command-line argument. So we escape it to defer its expansion until the command is executed remotely.



          With escaping,



          ssh remotehost "kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')"


          or with here-doc



          ssh remotehost <<'EOF'
          kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')
          EOF


          Also note that grep .. | grep .. | awk is superfluous. You can do the whole operation with awk alone. Or even better use pkill to get the process to kill directly by name.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Jan 24 at 6:32

























          answered Jan 24 at 6:18









          InianInian

          4,355925




          4,355925












          • ah, interesting. I thought it would ship the complete expression within the quotation marks just as it is. So the $ will be evaluated immediately?

            – chrise
            Jan 24 at 6:26











          • @chrise: In that case, it is preferred to use the second approach involving here-doc

            – Inian
            Jan 24 at 6:28











          • either way I try seems to not return. So if I run it from command line, it doesnt go back to the prompt. If I run it from a script it doesnt go to the next line. Do I need to somehow explicitly exit this?

            – chrise
            Jan 24 at 6:48











          • @chrise: You should use the here-docs carefully. There shouldn't be any leading spaces in the line after 'EOF', any leading spaces should be removed

            – Inian
            Jan 24 at 6:49

















          • ah, interesting. I thought it would ship the complete expression within the quotation marks just as it is. So the $ will be evaluated immediately?

            – chrise
            Jan 24 at 6:26











          • @chrise: In that case, it is preferred to use the second approach involving here-doc

            – Inian
            Jan 24 at 6:28











          • either way I try seems to not return. So if I run it from command line, it doesnt go back to the prompt. If I run it from a script it doesnt go to the next line. Do I need to somehow explicitly exit this?

            – chrise
            Jan 24 at 6:48











          • @chrise: You should use the here-docs carefully. There shouldn't be any leading spaces in the line after 'EOF', any leading spaces should be removed

            – Inian
            Jan 24 at 6:49
















          ah, interesting. I thought it would ship the complete expression within the quotation marks just as it is. So the $ will be evaluated immediately?

          – chrise
          Jan 24 at 6:26





          ah, interesting. I thought it would ship the complete expression within the quotation marks just as it is. So the $ will be evaluated immediately?

          – chrise
          Jan 24 at 6:26













          @chrise: In that case, it is preferred to use the second approach involving here-doc

          – Inian
          Jan 24 at 6:28





          @chrise: In that case, it is preferred to use the second approach involving here-doc

          – Inian
          Jan 24 at 6:28













          either way I try seems to not return. So if I run it from command line, it doesnt go back to the prompt. If I run it from a script it doesnt go to the next line. Do I need to somehow explicitly exit this?

          – chrise
          Jan 24 at 6:48





          either way I try seems to not return. So if I run it from command line, it doesnt go back to the prompt. If I run it from a script it doesnt go to the next line. Do I need to somehow explicitly exit this?

          – chrise
          Jan 24 at 6:48













          @chrise: You should use the here-docs carefully. There shouldn't be any leading spaces in the line after 'EOF', any leading spaces should be removed

          – Inian
          Jan 24 at 6:49





          @chrise: You should use the here-docs carefully. There shouldn't be any leading spaces in the line after 'EOF', any leading spaces should be removed

          – Inian
          Jan 24 at 6:49

















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