Getting awk value and outputting to a file [duplicate]












1
















This question already has an answer here:




  • Turn off buffering in pipe

    13 answers



  • Flush 'tail -f' buffer?

    2 answers



  • Why does awk do full buffering when reading from a pipe

    3 answers




I need to get a value from a log file which I am getting using awk at the moment. I can get the number printing on the console but when I try to put that value into a new file nothing happens. Here is what i have 



 sshpass -p $PASSWORD ssh $USERNAME@$REMOTE_IP_ADDR  tail -F $INPUT_FILE |  awk '{ print $16 }' > $OUTPUT_FILE



//when command is run without > $OUTPUT_FILE i get my value eg 4000


This isnt a buffering issue because there is nothing being outputted to the file. A file gets created but the value isnt written to the new file. Also my value is always being overwritten as it is reading a line from another script which continuously replaces the line I read.



So i have fixed the problem I was having. The solution was assigning the command to a variable and the writing that variable to a file. I tried this before but the issue I had was i had an extra space between my = sign and the command. Here is the working code 



 value=`sshpass -p $PASSWORD ssh $USERNAME@$REMOTE_IP_ADDR tail -n 1 $INPUT_FILE | awk '{ print $16 }'`



        echo $value



        echo $value > $OUTPUT_FILE



//will not work because of the space between "value= `sshpass"

 //  value= `sshpass -p $PASSWORD ssh $USERNAME@$REMOTE_IP_ADDR tail -n 1 $INPUT_FILE | awk '{ print $16 }'`





awk pipe cat







share|improve this question















marked as duplicate by Kusalananda♦ awk
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 Mar 5 at 9:29


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.



















  • What is the output of echo $OUTPUT_FILE?

    – Sparhawk
    Mar 5 at 9:17











  • Try to add on the end of line 2>&1

    – Romeo Ninov
    Mar 5 at 9:19











  • If I do echo $OUTPUT_FILE right now nothing gets printed out and the file itself is empty.

    – Owen
    Mar 5 at 9:20








  • 1





    If you try w/o -F on tail you will probably get the answer. This key keep the stream open and the redirection is buffered

    – Romeo Ninov
    Mar 5 at 9:27






  • 1





    yes that is a buffering issue, not on the output of awk but on its input; I suggest you try gawk instead of awk or awk -Winteractive if the awk on your system is mawk (as on debian, ubuntu, etc).

    – mosvy
    Mar 5 at 10:42
















1
















This question already has an answer here:




  • Turn off buffering in pipe

    13 answers



  • Flush 'tail -f' buffer?

    2 answers



  • Why does awk do full buffering when reading from a pipe

    3 answers




I need to get a value from a log file which I am getting using awk at the moment. I can get the number printing on the console but when I try to put that value into a new file nothing happens. Here is what i have 



 sshpass -p $PASSWORD ssh $USERNAME@$REMOTE_IP_ADDR  tail -F $INPUT_FILE |  awk '{ print $16 }' > $OUTPUT_FILE



//when command is run without > $OUTPUT_FILE i get my value eg 4000


This isnt a buffering issue because there is nothing being outputted to the file. A file gets created but the value isnt written to the new file. Also my value is always being overwritten as it is reading a line from another script which continuously replaces the line I read.



So i have fixed the problem I was having. The solution was assigning the command to a variable and the writing that variable to a file. I tried this before but the issue I had was i had an extra space between my = sign and the command. Here is the working code 



 value=`sshpass -p $PASSWORD ssh $USERNAME@$REMOTE_IP_ADDR tail -n 1 $INPUT_FILE | awk '{ print $16 }'`



        echo $value



        echo $value > $OUTPUT_FILE



//will not work because of the space between "value= `sshpass"

 //  value= `sshpass -p $PASSWORD ssh $USERNAME@$REMOTE_IP_ADDR tail -n 1 $INPUT_FILE | awk '{ print $16 }'`





awk pipe cat







share|improve this question















marked as duplicate by Kusalananda♦ awk
Users with the  awk badge can single-handedly close awk questions as duplicates and reopen them as needed.

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 Mar 5 at 9:29


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.



















  • What is the output of echo $OUTPUT_FILE?

    – Sparhawk
    Mar 5 at 9:17











  • Try to add on the end of line 2>&1

    – Romeo Ninov
    Mar 5 at 9:19











  • If I do echo $OUTPUT_FILE right now nothing gets printed out and the file itself is empty.

    – Owen
    Mar 5 at 9:20








  • 1





    If you try w/o -F on tail you will probably get the answer. This key keep the stream open and the redirection is buffered

    – Romeo Ninov
    Mar 5 at 9:27






  • 1





    yes that is a buffering issue, not on the output of awk but on its input; I suggest you try gawk instead of awk or awk -Winteractive if the awk on your system is mawk (as on debian, ubuntu, etc).

    – mosvy
    Mar 5 at 10:42














1












1








1









This question already has an answer here:




  • Turn off buffering in pipe

    13 answers



  • Flush 'tail -f' buffer?

    2 answers



  • Why does awk do full buffering when reading from a pipe

    3 answers




I need to get a value from a log file which I am getting using awk at the moment. I can get the number printing on the console but when I try to put that value into a new file nothing happens. Here is what i have 



 sshpass -p $PASSWORD ssh $USERNAME@$REMOTE_IP_ADDR  tail -F $INPUT_FILE |  awk '{ print $16 }' > $OUTPUT_FILE



//when command is run without > $OUTPUT_FILE i get my value eg 4000


This isnt a buffering issue because there is nothing being outputted to the file. A file gets created but the value isnt written to the new file. Also my value is always being overwritten as it is reading a line from another script which continuously replaces the line I read.



So i have fixed the problem I was having. The solution was assigning the command to a variable and the writing that variable to a file. I tried this before but the issue I had was i had an extra space between my = sign and the command. Here is the working code 



 value=`sshpass -p $PASSWORD ssh $USERNAME@$REMOTE_IP_ADDR tail -n 1 $INPUT_FILE | awk '{ print $16 }'`



        echo $value



        echo $value > $OUTPUT_FILE



//will not work because of the space between "value= `sshpass"

 //  value= `sshpass -p $PASSWORD ssh $USERNAME@$REMOTE_IP_ADDR tail -n 1 $INPUT_FILE | awk '{ print $16 }'`





awk pipe cat







share|improve this question

















This question already has an answer here:




  • Turn off buffering in pipe

    13 answers



  • Flush 'tail -f' buffer?

    2 answers



  • Why does awk do full buffering when reading from a pipe

    3 answers




I need to get a value from a log file which I am getting using awk at the moment. I can get the number printing on the console but when I try to put that value into a new file nothing happens. Here is what i have 



 sshpass -p $PASSWORD ssh $USERNAME@$REMOTE_IP_ADDR  tail -F $INPUT_FILE |  awk '{ print $16 }' > $OUTPUT_FILE



//when command is run without > $OUTPUT_FILE i get my value eg 4000


This isnt a buffering issue because there is nothing being outputted to the file. A file gets created but the value isnt written to the new file. Also my value is always being overwritten as it is reading a line from another script which continuously replaces the line I read.



So i have fixed the problem I was having. The solution was assigning the command to a variable and the writing that variable to a file. I tried this before but the issue I had was i had an extra space between my = sign and the command. Here is the working code 



 value=`sshpass -p $PASSWORD ssh $USERNAME@$REMOTE_IP_ADDR tail -n 1 $INPUT_FILE | awk '{ print $16 }'`



        echo $value



        echo $value > $OUTPUT_FILE



//will not work because of the space between "value= `sshpass"

 //  value= `sshpass -p $PASSWORD ssh $USERNAME@$REMOTE_IP_ADDR tail -n 1 $INPUT_FILE | awk '{ print $16 }'`




This question already has an answer here:




  • Turn off buffering in pipe

    13 answers



  • Flush 'tail -f' buffer?

    2 answers



  • Why does awk do full buffering when reading from a pipe

    3 answers







awk pipe cat




awk pipe cat






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Mar 5 at 10:42







Owen

















asked Mar 5 at 9:14









OwenOwen

65




65




marked as duplicate by Kusalananda♦ awk
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 Mar 5 at 9:29


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.









marked as duplicate by Kusalananda♦ awk
Users with the  awk badge can single-handedly close awk questions as duplicates and reopen them as needed.

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 Mar 5 at 9:29


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.















  • What is the output of echo $OUTPUT_FILE?

    – Sparhawk
    Mar 5 at 9:17











  • Try to add on the end of line 2>&1

    – Romeo Ninov
    Mar 5 at 9:19











  • If I do echo $OUTPUT_FILE right now nothing gets printed out and the file itself is empty.

    – Owen
    Mar 5 at 9:20








  • 1





    If you try w/o -F on tail you will probably get the answer. This key keep the stream open and the redirection is buffered

    – Romeo Ninov
    Mar 5 at 9:27






  • 1





    yes that is a buffering issue, not on the output of awk but on its input; I suggest you try gawk instead of awk or awk -Winteractive if the awk on your system is mawk (as on debian, ubuntu, etc).

    – mosvy
    Mar 5 at 10:42



















  • What is the output of echo $OUTPUT_FILE?

    – Sparhawk
    Mar 5 at 9:17











  • Try to add on the end of line 2>&1

    – Romeo Ninov
    Mar 5 at 9:19











  • If I do echo $OUTPUT_FILE right now nothing gets printed out and the file itself is empty.

    – Owen
    Mar 5 at 9:20








  • 1





    If you try w/o -F on tail you will probably get the answer. This key keep the stream open and the redirection is buffered

    – Romeo Ninov
    Mar 5 at 9:27






  • 1





    yes that is a buffering issue, not on the output of awk but on its input; I suggest you try gawk instead of awk or awk -Winteractive if the awk on your system is mawk (as on debian, ubuntu, etc).

    – mosvy
    Mar 5 at 10:42

















What is the output of echo $OUTPUT_FILE?

– Sparhawk
Mar 5 at 9:17





What is the output of echo $OUTPUT_FILE?

– Sparhawk
Mar 5 at 9:17













Try to add on the end of line 2>&1

– Romeo Ninov
Mar 5 at 9:19





Try to add on the end of line 2>&1

– Romeo Ninov
Mar 5 at 9:19













If I do echo $OUTPUT_FILE right now nothing gets printed out and the file itself is empty.

– Owen
Mar 5 at 9:20







If I do echo $OUTPUT_FILE right now nothing gets printed out and the file itself is empty.

– Owen
Mar 5 at 9:20






1




1





If you try w/o -F on tail you will probably get the answer. This key keep the stream open and the redirection is buffered

– Romeo Ninov
Mar 5 at 9:27





If you try w/o -F on tail you will probably get the answer. This key keep the stream open and the redirection is buffered

– Romeo Ninov
Mar 5 at 9:27




1




1





yes that is a buffering issue, not on the output of awk but on its input; I suggest you try gawk instead of awk or awk -Winteractive if the awk on your system is mawk (as on debian, ubuntu, etc).

– mosvy
Mar 5 at 10:42





yes that is a buffering issue, not on the output of awk but on its input; I suggest you try gawk instead of awk or awk -Winteractive if the awk on your system is mawk (as on debian, ubuntu, etc).

– mosvy
Mar 5 at 10:42










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