How to use awk build in variable in shell script












0















I need to use awk build in variable $NF with shell script. The input string will be something like this



Chapl 222222/0: Pran=28e2 Load=0.000 kkk Statevfe=Nowf Alarmkj fIMmg=1 LkouIM="087" Po89rt="eth566" NE40Ef-02-T1M1N2-HUW_S1_RD


I want to extract the last element alone from this string



NE40Ef-02-T1M1N2-HUW_S1_RD


In the server if I do something like this 



cat aa |awk '{print $NF}'


I get the correct result. But when I try to do ssh and then try to execute the same it does not understand what is $NF.



I am trying to do something like this 



cat aa |awk -v temp ="$NF" '{print $NF}'


But this does not work.






shell awk







share|improve this question

























  • foo=($(cat aa)); temp="${foo[${#foo[@]}-1]}"?

    – Cyrus
    Jan 1 at 13:39













  • awk -v temp ="$NF" will assign the shell variable NF to a new awk variable temp that can be used only inside awk. The shell variable NF has only the same name as the awk variable.

    – Walter A
    Jan 1 at 13:41











  • temp=$(sed 's/.* //' aa) removing everything until (including) the last space.

    – Walter A
    Jan 1 at 13:43


















0















I need to use awk build in variable $NF with shell script. The input string will be something like this



Chapl 222222/0: Pran=28e2 Load=0.000 kkk Statevfe=Nowf Alarmkj fIMmg=1 LkouIM="087" Po89rt="eth566" NE40Ef-02-T1M1N2-HUW_S1_RD


I want to extract the last element alone from this string



NE40Ef-02-T1M1N2-HUW_S1_RD


In the server if I do something like this 



cat aa |awk '{print $NF}'


I get the correct result. But when I try to do ssh and then try to execute the same it does not understand what is $NF.



I am trying to do something like this 



cat aa |awk -v temp ="$NF" '{print $NF}'


But this does not work.






shell awk







share|improve this question

























  • foo=($(cat aa)); temp="${foo[${#foo[@]}-1]}"?

    – Cyrus
    Jan 1 at 13:39













  • awk -v temp ="$NF" will assign the shell variable NF to a new awk variable temp that can be used only inside awk. The shell variable NF has only the same name as the awk variable.

    – Walter A
    Jan 1 at 13:41











  • temp=$(sed 's/.* //' aa) removing everything until (including) the last space.

    – Walter A
    Jan 1 at 13:43
















0












0








0








I need to use awk build in variable $NF with shell script. The input string will be something like this



Chapl 222222/0: Pran=28e2 Load=0.000 kkk Statevfe=Nowf Alarmkj fIMmg=1 LkouIM="087" Po89rt="eth566" NE40Ef-02-T1M1N2-HUW_S1_RD


I want to extract the last element alone from this string



NE40Ef-02-T1M1N2-HUW_S1_RD


In the server if I do something like this 



cat aa |awk '{print $NF}'


I get the correct result. But when I try to do ssh and then try to execute the same it does not understand what is $NF.



I am trying to do something like this 



cat aa |awk -v temp ="$NF" '{print $NF}'


But this does not work.






shell awk







share|improve this question
















I need to use awk build in variable $NF with shell script. The input string will be something like this



Chapl 222222/0: Pran=28e2 Load=0.000 kkk Statevfe=Nowf Alarmkj fIMmg=1 LkouIM="087" Po89rt="eth566" NE40Ef-02-T1M1N2-HUW_S1_RD


I want to extract the last element alone from this string



NE40Ef-02-T1M1N2-HUW_S1_RD


In the server if I do something like this 



cat aa |awk '{print $NF}'


I get the correct result. But when I try to do ssh and then try to execute the same it does not understand what is $NF.



I am trying to do something like this 



cat aa |awk -v temp ="$NF" '{print $NF}'


But this does not work.






shell awk




shell awk






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Jan 1 at 13:35









Cyrus

46.2k43878




46.2k43878










asked Jan 1 at 12:14









user1107731user1107731

66117




66117













  • foo=($(cat aa)); temp="${foo[${#foo[@]}-1]}"?

    – Cyrus
    Jan 1 at 13:39













  • awk -v temp ="$NF" will assign the shell variable NF to a new awk variable temp that can be used only inside awk. The shell variable NF has only the same name as the awk variable.

    – Walter A
    Jan 1 at 13:41











  • temp=$(sed 's/.* //' aa) removing everything until (including) the last space.

    – Walter A
    Jan 1 at 13:43





















  • foo=($(cat aa)); temp="${foo[${#foo[@]}-1]}"?

    – Cyrus
    Jan 1 at 13:39













  • awk -v temp ="$NF" will assign the shell variable NF to a new awk variable temp that can be used only inside awk. The shell variable NF has only the same name as the awk variable.

    – Walter A
    Jan 1 at 13:41











  • temp=$(sed 's/.* //' aa) removing everything until (including) the last space.

    – Walter A
    Jan 1 at 13:43



















foo=($(cat aa)); temp="${foo[${#foo[@]}-1]}"?

– Cyrus
Jan 1 at 13:39







foo=($(cat aa)); temp="${foo[${#foo[@]}-1]}"?

– Cyrus
Jan 1 at 13:39















awk -v temp ="$NF" will assign the shell variable NF to a new awk variable temp that can be used only inside awk. The shell variable NF has only the same name as the awk variable.

– Walter A
Jan 1 at 13:41





awk -v temp ="$NF" will assign the shell variable NF to a new awk variable temp that can be used only inside awk. The shell variable NF has only the same name as the awk variable.

– Walter A
Jan 1 at 13:41













temp=$(sed 's/.* //' aa) removing everything until (including) the last space.

– Walter A
Jan 1 at 13:43







temp=$(sed 's/.* //' aa) removing everything until (including) the last space.

– Walter A
Jan 1 at 13:43














2 Answers
2






active

oldest

votes


















0














Something like that?



temp=$(awk '{print $NF}' aa)





share|improve this answer
























  • What if the string is not present in the file. The output in the string is got when I execute a command like "some chn ". This will give list of all links present in the server. Some 100 strings like I listed in the example. I want to get the links which has zero traffic. The link is the last element present in each row. What I want is something like this "some chn" | grep ""Load= 0.000" |awk -v temp=$(awk '{print $NF}' )'{print $temp}' . But this does not work

    – user1107731
    Jan 1 at 14:53



















0














shell version (ksh, bash)



temp='Chapl 222222/0: Pran=28e2 Load=0.000 kkk Statevfe=Nowf Alarmkj fIMmg=1 LkouIM="087" Po89rt="eth566" NE40Ef-02-T1M1N2-HUW_S1_RD'

temp="${temp##* }"





 # or in ssh script using output

 temp="$( cat aa )"

 echo "${temp##* }"





share|improve this answer























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    2 Answers
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    2 Answers
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    0














    Something like that?



    temp=$(awk '{print $NF}' aa)





    share|improve this answer
























    • What if the string is not present in the file. The output in the string is got when I execute a command like "some chn ". This will give list of all links present in the server. Some 100 strings like I listed in the example. I want to get the links which has zero traffic. The link is the last element present in each row. What I want is something like this "some chn" | grep ""Load= 0.000" |awk -v temp=$(awk '{print $NF}' )'{print $temp}' . But this does not work

      – user1107731
      Jan 1 at 14:53
















    0














    Something like that?



    temp=$(awk '{print $NF}' aa)





    share|improve this answer
























    • What if the string is not present in the file. The output in the string is got when I execute a command like "some chn ". This will give list of all links present in the server. Some 100 strings like I listed in the example. I want to get the links which has zero traffic. The link is the last element present in each row. What I want is something like this "some chn" | grep ""Load= 0.000" |awk -v temp=$(awk '{print $NF}' )'{print $temp}' . But this does not work

      – user1107731
      Jan 1 at 14:53














    0












    0








    0







    Something like that?



    temp=$(awk '{print $NF}' aa)





    share|improve this answer













    Something like that?



    temp=$(awk '{print $NF}' aa)






    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered Jan 1 at 13:28









    CyrusCyrus

    46.2k43878




    46.2k43878













    • What if the string is not present in the file. The output in the string is got when I execute a command like "some chn ". This will give list of all links present in the server. Some 100 strings like I listed in the example. I want to get the links which has zero traffic. The link is the last element present in each row. What I want is something like this "some chn" | grep ""Load= 0.000" |awk -v temp=$(awk '{print $NF}' )'{print $temp}' . But this does not work

      – user1107731
      Jan 1 at 14:53



















    • What if the string is not present in the file. The output in the string is got when I execute a command like "some chn ". This will give list of all links present in the server. Some 100 strings like I listed in the example. I want to get the links which has zero traffic. The link is the last element present in each row. What I want is something like this "some chn" | grep ""Load= 0.000" |awk -v temp=$(awk '{print $NF}' )'{print $temp}' . But this does not work

      – user1107731
      Jan 1 at 14:53

















    What if the string is not present in the file. The output in the string is got when I execute a command like "some chn ". This will give list of all links present in the server. Some 100 strings like I listed in the example. I want to get the links which has zero traffic. The link is the last element present in each row. What I want is something like this "some chn" | grep ""Load= 0.000" |awk -v temp=$(awk '{print $NF}' )'{print $temp}' . But this does not work

    – user1107731
    Jan 1 at 14:53





    What if the string is not present in the file. The output in the string is got when I execute a command like "some chn ". This will give list of all links present in the server. Some 100 strings like I listed in the example. I want to get the links which has zero traffic. The link is the last element present in each row. What I want is something like this "some chn" | grep ""Load= 0.000" |awk -v temp=$(awk '{print $NF}' )'{print $temp}' . But this does not work

    – user1107731
    Jan 1 at 14:53













    0














    shell version (ksh, bash)



    temp='Chapl 222222/0: Pran=28e2 Load=0.000 kkk Statevfe=Nowf Alarmkj fIMmg=1 LkouIM="087" Po89rt="eth566" NE40Ef-02-T1M1N2-HUW_S1_RD'
    
temp="${temp##* }"
    

    

    
 # or in ssh script using output
    
 temp="$( cat aa )"
    
 echo "${temp##* }"





    share|improve this answer




























      0














      shell version (ksh, bash)



      temp='Chapl 222222/0: Pran=28e2 Load=0.000 kkk Statevfe=Nowf Alarmkj fIMmg=1 LkouIM="087" Po89rt="eth566" NE40Ef-02-T1M1N2-HUW_S1_RD'
      
temp="${temp##* }"
      

      

      
 # or in ssh script using output
      
 temp="$( cat aa )"
      
 echo "${temp##* }"





      share|improve this answer


























        0












        0








        0







        shell version (ksh, bash)



        temp='Chapl 222222/0: Pran=28e2 Load=0.000 kkk Statevfe=Nowf Alarmkj fIMmg=1 LkouIM="087" Po89rt="eth566" NE40Ef-02-T1M1N2-HUW_S1_RD'
        
temp="${temp##* }"
        

        

        
 # or in ssh script using output
        
 temp="$( cat aa )"
        
 echo "${temp##* }"





        share|improve this answer













        shell version (ksh, bash)



        temp='Chapl 222222/0: Pran=28e2 Load=0.000 kkk Statevfe=Nowf Alarmkj fIMmg=1 LkouIM="087" Po89rt="eth566" NE40Ef-02-T1M1N2-HUW_S1_RD'
        
temp="${temp##* }"
        

        

        
 # or in ssh script using output
        
 temp="$( cat aa )"
        
 echo "${temp##* }"






        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Jan 2 at 14:51









        NeronLeVeluNeronLeVelu

        8,66011737




        8,66011737






























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