Integrate awk one-liner into awk script?











up vote
0
down vote

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If I have this one-liner



$ echo 0123456789ab | awk '{gsub(/..B/,"&:")}1'

01:23:45:67:89:ab


which I would like to use in an awk script, and therefore tries



cat $hosts | awk '{

    print "host "$5" {"

    print "  option host-name ""$5"";"

    print "  hardware ethernet "$3";"

    x = {gsub(/..B/,"&:")}1

    print "  fixed-address "print x";"

    print "}"

    print ""

}' > /etc/dhcp/reservations.conf


but it fails with



awk: cmd. line:5:     x = {gsub(/..B/,"&:")}1

awk: cmd. line:5:         ^ syntax error

awk: cmd. line:6:     print "  fixed-address "print x";"

awk: cmd. line:6:                             ^ syntax error


Question



Does anyone know how to integrate such one-liners into an awk script?






linux awk







share|improve this question
























  • What is your input file?
    – Inian
    Nov 12 at 10:48










  • You should remove the { around the gsub command as this is not a one-liner anymore (and maybe remove the 1 entirely)
    – Aserre
    Nov 12 at 10:49












  • @Sandra Schlichting, you need NOT to use cat with awk, awk could read files by itself too.
    – RavinderSingh13
    Nov 12 at 11:00










  • Show us the input file you are working with? What is the value that you want to gsub() on? What is the expected output
    – Inian
    Nov 12 at 11:11















up vote
0
down vote

favorite












If I have this one-liner



$ echo 0123456789ab | awk '{gsub(/..B/,"&:")}1'

01:23:45:67:89:ab


which I would like to use in an awk script, and therefore tries



cat $hosts | awk '{

    print "host "$5" {"

    print "  option host-name ""$5"";"

    print "  hardware ethernet "$3";"

    x = {gsub(/..B/,"&:")}1

    print "  fixed-address "print x";"

    print "}"

    print ""

}' > /etc/dhcp/reservations.conf


but it fails with



awk: cmd. line:5:     x = {gsub(/..B/,"&:")}1

awk: cmd. line:5:         ^ syntax error

awk: cmd. line:6:     print "  fixed-address "print x";"

awk: cmd. line:6:                             ^ syntax error


Question



Does anyone know how to integrate such one-liners into an awk script?






linux awk







share|improve this question
























  • What is your input file?
    – Inian
    Nov 12 at 10:48










  • You should remove the { around the gsub command as this is not a one-liner anymore (and maybe remove the 1 entirely)
    – Aserre
    Nov 12 at 10:49












  • @Sandra Schlichting, you need NOT to use cat with awk, awk could read files by itself too.
    – RavinderSingh13
    Nov 12 at 11:00










  • Show us the input file you are working with? What is the value that you want to gsub() on? What is the expected output
    – Inian
    Nov 12 at 11:11













up vote
0
down vote

favorite









up vote
0
down vote

favorite











If I have this one-liner



$ echo 0123456789ab | awk '{gsub(/..B/,"&:")}1'

01:23:45:67:89:ab


which I would like to use in an awk script, and therefore tries



cat $hosts | awk '{

    print "host "$5" {"

    print "  option host-name ""$5"";"

    print "  hardware ethernet "$3";"

    x = {gsub(/..B/,"&:")}1

    print "  fixed-address "print x";"

    print "}"

    print ""

}' > /etc/dhcp/reservations.conf


but it fails with



awk: cmd. line:5:     x = {gsub(/..B/,"&:")}1

awk: cmd. line:5:         ^ syntax error

awk: cmd. line:6:     print "  fixed-address "print x";"

awk: cmd. line:6:                             ^ syntax error


Question



Does anyone know how to integrate such one-liners into an awk script?






linux awk







share|improve this question















If I have this one-liner



$ echo 0123456789ab | awk '{gsub(/..B/,"&:")}1'

01:23:45:67:89:ab


which I would like to use in an awk script, and therefore tries



cat $hosts | awk '{

    print "host "$5" {"

    print "  option host-name ""$5"";"

    print "  hardware ethernet "$3";"

    x = {gsub(/..B/,"&:")}1

    print "  fixed-address "print x";"

    print "}"

    print ""

}' > /etc/dhcp/reservations.conf


but it fails with



awk: cmd. line:5:     x = {gsub(/..B/,"&:")}1

awk: cmd. line:5:         ^ syntax error

awk: cmd. line:6:     print "  fixed-address "print x";"

awk: cmd. line:6:                             ^ syntax error


Question



Does anyone know how to integrate such one-liners into an awk script?






linux awk




linux awk






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 12 at 11:10









Inian

38.4k63669




38.4k63669










asked Nov 12 at 10:43









Sandra Schlichting

9,0652677125




9,0652677125












  • What is your input file?
    – Inian
    Nov 12 at 10:48










  • You should remove the { around the gsub command as this is not a one-liner anymore (and maybe remove the 1 entirely)
    – Aserre
    Nov 12 at 10:49












  • @Sandra Schlichting, you need NOT to use cat with awk, awk could read files by itself too.
    – RavinderSingh13
    Nov 12 at 11:00










  • Show us the input file you are working with? What is the value that you want to gsub() on? What is the expected output
    – Inian
    Nov 12 at 11:11


















  • What is your input file?
    – Inian
    Nov 12 at 10:48










  • You should remove the { around the gsub command as this is not a one-liner anymore (and maybe remove the 1 entirely)
    – Aserre
    Nov 12 at 10:49












  • @Sandra Schlichting, you need NOT to use cat with awk, awk could read files by itself too.
    – RavinderSingh13
    Nov 12 at 11:00










  • Show us the input file you are working with? What is the value that you want to gsub() on? What is the expected output
    – Inian
    Nov 12 at 11:11
















What is your input file?
– Inian
Nov 12 at 10:48




What is your input file?
– Inian
Nov 12 at 10:48












You should remove the { around the gsub command as this is not a one-liner anymore (and maybe remove the 1 entirely)
– Aserre
Nov 12 at 10:49






You should remove the { around the gsub command as this is not a one-liner anymore (and maybe remove the 1 entirely)
– Aserre
Nov 12 at 10:49














@Sandra Schlichting, you need NOT to use cat with awk, awk could read files by itself too.
– RavinderSingh13
Nov 12 at 11:00




@Sandra Schlichting, you need NOT to use cat with awk, awk could read files by itself too.
– RavinderSingh13
Nov 12 at 11:00












Show us the input file you are working with? What is the value that you want to gsub() on? What is the expected output
– Inian
Nov 12 at 11:11




Show us the input file you are working with? What is the value that you want to gsub() on? What is the expected output
– Inian
Nov 12 at 11:11












1 Answer
1






active

oldest

votes

















up vote
1
down vote



accepted










You can't save { in to a variable since it denotes some action. Moreover in case you save output of sub or gsub it always gives you the count of substitutes it made to line/variable. so better try to change that code line to following.



Change your 2 lines:



x = {gsub(/..B/,"&:")}1

print "  fixed-address "print x";"


To:



new_line=$0

gsub(/..B/,"&:",new_line)

print "  fixed-address "new_line";"


By doing above your actual line's value will NEVER change and you could use it doing other stuff later point of time in your code too. I haven't tested above since samples were not given but it should work.






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    1 Answer
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    1






    active

    oldest

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    votes






    active

    oldest

    votes








    up vote
    1
    down vote



    accepted










    You can't save { in to a variable since it denotes some action. Moreover in case you save output of sub or gsub it always gives you the count of substitutes it made to line/variable. so better try to change that code line to following.



    Change your 2 lines:



    x = {gsub(/..B/,"&:")}1
    
print "  fixed-address "print x";"


    To:



    new_line=$0
    
gsub(/..B/,"&:",new_line)
    
print "  fixed-address "new_line";"


    By doing above your actual line's value will NEVER change and you could use it doing other stuff later point of time in your code too. I haven't tested above since samples were not given but it should work.






    share|improve this answer



























      up vote
      1
      down vote



      accepted










      You can't save { in to a variable since it denotes some action. Moreover in case you save output of sub or gsub it always gives you the count of substitutes it made to line/variable. so better try to change that code line to following.



      Change your 2 lines:



      x = {gsub(/..B/,"&:")}1
      
print "  fixed-address "print x";"


      To:



      new_line=$0
      
gsub(/..B/,"&:",new_line)
      
print "  fixed-address "new_line";"


      By doing above your actual line's value will NEVER change and you could use it doing other stuff later point of time in your code too. I haven't tested above since samples were not given but it should work.






      share|improve this answer

























        up vote
        1
        down vote



        accepted







        up vote
        1
        down vote



        accepted






        You can't save { in to a variable since it denotes some action. Moreover in case you save output of sub or gsub it always gives you the count of substitutes it made to line/variable. so better try to change that code line to following.



        Change your 2 lines:



        x = {gsub(/..B/,"&:")}1
        
print "  fixed-address "print x";"


        To:



        new_line=$0
        
gsub(/..B/,"&:",new_line)
        
print "  fixed-address "new_line";"


        By doing above your actual line's value will NEVER change and you could use it doing other stuff later point of time in your code too. I haven't tested above since samples were not given but it should work.






        share|improve this answer














        You can't save { in to a variable since it denotes some action. Moreover in case you save output of sub or gsub it always gives you the count of substitutes it made to line/variable. so better try to change that code line to following.



        Change your 2 lines:



        x = {gsub(/..B/,"&:")}1
        
print "  fixed-address "print x";"


        To:



        new_line=$0
        
gsub(/..B/,"&:",new_line)
        
print "  fixed-address "new_line";"


        By doing above your actual line's value will NEVER change and you could use it doing other stuff later point of time in your code too. I haven't tested above since samples were not given but it should work.







        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited Nov 12 at 10:56

























        answered Nov 12 at 10:48









        RavinderSingh13

        25.4k41438




        25.4k41438






























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