Add prefix to each lines of file from other file












0















I have two files named file1.txt and file2.txt, I'm trying to add the prefix to file2.txt from file1.txt in a manner so I can pipe the results to the next utility I'm using.



cat file1.txt

aa
bb
cc

cat file2.txt

site.com
site2.com
site3.com


Expected result will look like:



aa.site.com
aa.site2.com
aa.site3.com
bb.site.com
bb.site2.com
bb.site3.com
cc.site.com
cc.site2.com
cc.site3.com









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  • Please take a look at: What should I do when someone answers my question?

    – Cyrus
    Jan 13 at 12:42
















0















I have two files named file1.txt and file2.txt, I'm trying to add the prefix to file2.txt from file1.txt in a manner so I can pipe the results to the next utility I'm using.



cat file1.txt

aa
bb
cc

cat file2.txt

site.com
site2.com
site3.com


Expected result will look like:



aa.site.com
aa.site2.com
aa.site3.com
bb.site.com
bb.site2.com
bb.site3.com
cc.site.com
cc.site2.com
cc.site3.com









share|improve this question























  • Please take a look at: What should I do when someone answers my question?

    – Cyrus
    Jan 13 at 12:42














0












0








0








I have two files named file1.txt and file2.txt, I'm trying to add the prefix to file2.txt from file1.txt in a manner so I can pipe the results to the next utility I'm using.



cat file1.txt

aa
bb
cc

cat file2.txt

site.com
site2.com
site3.com


Expected result will look like:



aa.site.com
aa.site2.com
aa.site3.com
bb.site.com
bb.site2.com
bb.site3.com
cc.site.com
cc.site2.com
cc.site3.com









share|improve this question














I have two files named file1.txt and file2.txt, I'm trying to add the prefix to file2.txt from file1.txt in a manner so I can pipe the results to the next utility I'm using.



cat file1.txt

aa
bb
cc

cat file2.txt

site.com
site2.com
site3.com


Expected result will look like:



aa.site.com
aa.site2.com
aa.site3.com
bb.site.com
bb.site2.com
bb.site3.com
cc.site.com
cc.site2.com
cc.site3.com






linux command-line sed






share|improve this question













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share|improve this question










asked Jan 12 at 10:00









SamSam

1




1













  • Please take a look at: What should I do when someone answers my question?

    – Cyrus
    Jan 13 at 12:42



















  • Please take a look at: What should I do when someone answers my question?

    – Cyrus
    Jan 13 at 12:42

















Please take a look at: What should I do when someone answers my question?

– Cyrus
Jan 13 at 12:42





Please take a look at: What should I do when someone answers my question?

– Cyrus
Jan 13 at 12:42










2 Answers
2






active

oldest

votes


















1














With bash:



while IFS= read -r line1; do while IFS= read -r line2; do echo "$line1.$line2"; done <file2.txt; done <file1.txt


or



join -j 64 <(sort file1.txt) <(sort file2.txt) -o 1.1,2.1 | sed 's/ /./'


Output:




aa.site.com
aa.site2.com
aa.site3.com
bb.site.com
bb.site2.com
bb.site3.com
cc.site.com
cc.site2.com
cc.site3.com





share|improve this answer


























  • Thank you for your answer @Cyrus, it works as expected.

    – Sam
    Jan 13 at 12:09



















1
















The easy part is that you can use paste to merge the lines of your files. Its -d option lets you choose a delimiter (here, a .).



The hard part here is the Cartesian product. Borrowing from this answer on SO, we can come up with a command like this:



paste -d '.' 
<(sed -n "$(yes 'p;' | head -n $(wc -l <file2.txt) )" file1.txt)
<(cat $(yes 'file2.txt' | head -n $(wc -l <file1.txt)))


Where we:




  • Combine yes and head to make a sed script that will print each line of file1.txt a number of times equal to the number of lines in file2.txt;

  • Combine yes and head to make cat print file2.txt a number of times equal to the number of lines in file1.txt;

  • Use paste to merge each pair of lines printed by the two process substitutions (<(...)), separated by a ..


Of course you can pipe the result into other commands.

Also, note that you can always pipe the output of commands, even if they are in a loop, as in this other answer you have. E.g. try



while ... do ... done <file | cat -


For convenience, you can define a function and make it available to your environment (e.g. defining it in your .bashrc if you use bash).

An example, here using loops to minimize the need for external tools:



function cart_prod () {
while IFS= read -r line1; do
while IFS= read -r line2; do
printf '%s.%sn' "$line1" "$line2"
done <"$2"
done <"$1"
}


Sample usage:



$ cart_prod file1.txt file2.txt | sort -r
cc.site.com
cc.site3.com
cc.site2.com
bb.site.com
bb.site3.com
bb.site2.com
aa.site.com
aa.site3.com
aa.site2.com





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    2 Answers
    2






    active

    oldest

    votes








    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    1














    With bash:



    while IFS= read -r line1; do while IFS= read -r line2; do echo "$line1.$line2"; done <file2.txt; done <file1.txt


    or



    join -j 64 <(sort file1.txt) <(sort file2.txt) -o 1.1,2.1 | sed 's/ /./'


    Output:




    aa.site.com
    aa.site2.com
    aa.site3.com
    bb.site.com
    bb.site2.com
    bb.site3.com
    cc.site.com
    cc.site2.com
    cc.site3.com





    share|improve this answer


























    • Thank you for your answer @Cyrus, it works as expected.

      – Sam
      Jan 13 at 12:09
















    1














    With bash:



    while IFS= read -r line1; do while IFS= read -r line2; do echo "$line1.$line2"; done <file2.txt; done <file1.txt


    or



    join -j 64 <(sort file1.txt) <(sort file2.txt) -o 1.1,2.1 | sed 's/ /./'


    Output:




    aa.site.com
    aa.site2.com
    aa.site3.com
    bb.site.com
    bb.site2.com
    bb.site3.com
    cc.site.com
    cc.site2.com
    cc.site3.com





    share|improve this answer


























    • Thank you for your answer @Cyrus, it works as expected.

      – Sam
      Jan 13 at 12:09














    1












    1








    1







    With bash:



    while IFS= read -r line1; do while IFS= read -r line2; do echo "$line1.$line2"; done <file2.txt; done <file1.txt


    or



    join -j 64 <(sort file1.txt) <(sort file2.txt) -o 1.1,2.1 | sed 's/ /./'


    Output:




    aa.site.com
    aa.site2.com
    aa.site3.com
    bb.site.com
    bb.site2.com
    bb.site3.com
    cc.site.com
    cc.site2.com
    cc.site3.com





    share|improve this answer















    With bash:



    while IFS= read -r line1; do while IFS= read -r line2; do echo "$line1.$line2"; done <file2.txt; done <file1.txt


    or



    join -j 64 <(sort file1.txt) <(sort file2.txt) -o 1.1,2.1 | sed 's/ /./'


    Output:




    aa.site.com
    aa.site2.com
    aa.site3.com
    bb.site.com
    bb.site2.com
    bb.site3.com
    cc.site.com
    cc.site2.com
    cc.site3.com






    share|improve this answer














    share|improve this answer



    share|improve this answer








    edited Jan 12 at 11:13

























    answered Jan 12 at 11:08









    CyrusCyrus

    3,79611024




    3,79611024













    • Thank you for your answer @Cyrus, it works as expected.

      – Sam
      Jan 13 at 12:09



















    • Thank you for your answer @Cyrus, it works as expected.

      – Sam
      Jan 13 at 12:09

















    Thank you for your answer @Cyrus, it works as expected.

    – Sam
    Jan 13 at 12:09





    Thank you for your answer @Cyrus, it works as expected.

    – Sam
    Jan 13 at 12:09













    1
















    The easy part is that you can use paste to merge the lines of your files. Its -d option lets you choose a delimiter (here, a .).



    The hard part here is the Cartesian product. Borrowing from this answer on SO, we can come up with a command like this:



    paste -d '.' 
    <(sed -n "$(yes 'p;' | head -n $(wc -l <file2.txt) )" file1.txt)
    <(cat $(yes 'file2.txt' | head -n $(wc -l <file1.txt)))


    Where we:




    • Combine yes and head to make a sed script that will print each line of file1.txt a number of times equal to the number of lines in file2.txt;

    • Combine yes and head to make cat print file2.txt a number of times equal to the number of lines in file1.txt;

    • Use paste to merge each pair of lines printed by the two process substitutions (<(...)), separated by a ..


    Of course you can pipe the result into other commands.

    Also, note that you can always pipe the output of commands, even if they are in a loop, as in this other answer you have. E.g. try



    while ... do ... done <file | cat -


    For convenience, you can define a function and make it available to your environment (e.g. defining it in your .bashrc if you use bash).

    An example, here using loops to minimize the need for external tools:



    function cart_prod () {
    while IFS= read -r line1; do
    while IFS= read -r line2; do
    printf '%s.%sn' "$line1" "$line2"
    done <"$2"
    done <"$1"
    }


    Sample usage:



    $ cart_prod file1.txt file2.txt | sort -r
    cc.site.com
    cc.site3.com
    cc.site2.com
    bb.site.com
    bb.site3.com
    bb.site2.com
    aa.site.com
    aa.site3.com
    aa.site2.com





    share|improve this answer






























      1
















      The easy part is that you can use paste to merge the lines of your files. Its -d option lets you choose a delimiter (here, a .).



      The hard part here is the Cartesian product. Borrowing from this answer on SO, we can come up with a command like this:



      paste -d '.' 
      <(sed -n "$(yes 'p;' | head -n $(wc -l <file2.txt) )" file1.txt)
      <(cat $(yes 'file2.txt' | head -n $(wc -l <file1.txt)))


      Where we:




      • Combine yes and head to make a sed script that will print each line of file1.txt a number of times equal to the number of lines in file2.txt;

      • Combine yes and head to make cat print file2.txt a number of times equal to the number of lines in file1.txt;

      • Use paste to merge each pair of lines printed by the two process substitutions (<(...)), separated by a ..


      Of course you can pipe the result into other commands.

      Also, note that you can always pipe the output of commands, even if they are in a loop, as in this other answer you have. E.g. try



      while ... do ... done <file | cat -


      For convenience, you can define a function and make it available to your environment (e.g. defining it in your .bashrc if you use bash).

      An example, here using loops to minimize the need for external tools:



      function cart_prod () {
      while IFS= read -r line1; do
      while IFS= read -r line2; do
      printf '%s.%sn' "$line1" "$line2"
      done <"$2"
      done <"$1"
      }


      Sample usage:



      $ cart_prod file1.txt file2.txt | sort -r
      cc.site.com
      cc.site3.com
      cc.site2.com
      bb.site.com
      bb.site3.com
      bb.site2.com
      aa.site.com
      aa.site3.com
      aa.site2.com





      share|improve this answer




























        1












        1








        1









        The easy part is that you can use paste to merge the lines of your files. Its -d option lets you choose a delimiter (here, a .).



        The hard part here is the Cartesian product. Borrowing from this answer on SO, we can come up with a command like this:



        paste -d '.' 
        <(sed -n "$(yes 'p;' | head -n $(wc -l <file2.txt) )" file1.txt)
        <(cat $(yes 'file2.txt' | head -n $(wc -l <file1.txt)))


        Where we:




        • Combine yes and head to make a sed script that will print each line of file1.txt a number of times equal to the number of lines in file2.txt;

        • Combine yes and head to make cat print file2.txt a number of times equal to the number of lines in file1.txt;

        • Use paste to merge each pair of lines printed by the two process substitutions (<(...)), separated by a ..


        Of course you can pipe the result into other commands.

        Also, note that you can always pipe the output of commands, even if they are in a loop, as in this other answer you have. E.g. try



        while ... do ... done <file | cat -


        For convenience, you can define a function and make it available to your environment (e.g. defining it in your .bashrc if you use bash).

        An example, here using loops to minimize the need for external tools:



        function cart_prod () {
        while IFS= read -r line1; do
        while IFS= read -r line2; do
        printf '%s.%sn' "$line1" "$line2"
        done <"$2"
        done <"$1"
        }


        Sample usage:



        $ cart_prod file1.txt file2.txt | sort -r
        cc.site.com
        cc.site3.com
        cc.site2.com
        bb.site.com
        bb.site3.com
        bb.site2.com
        aa.site.com
        aa.site3.com
        aa.site2.com





        share|improve this answer

















        The easy part is that you can use paste to merge the lines of your files. Its -d option lets you choose a delimiter (here, a .).



        The hard part here is the Cartesian product. Borrowing from this answer on SO, we can come up with a command like this:



        paste -d '.' 
        <(sed -n "$(yes 'p;' | head -n $(wc -l <file2.txt) )" file1.txt)
        <(cat $(yes 'file2.txt' | head -n $(wc -l <file1.txt)))


        Where we:




        • Combine yes and head to make a sed script that will print each line of file1.txt a number of times equal to the number of lines in file2.txt;

        • Combine yes and head to make cat print file2.txt a number of times equal to the number of lines in file1.txt;

        • Use paste to merge each pair of lines printed by the two process substitutions (<(...)), separated by a ..


        Of course you can pipe the result into other commands.

        Also, note that you can always pipe the output of commands, even if they are in a loop, as in this other answer you have. E.g. try



        while ... do ... done <file | cat -


        For convenience, you can define a function and make it available to your environment (e.g. defining it in your .bashrc if you use bash).

        An example, here using loops to minimize the need for external tools:



        function cart_prod () {
        while IFS= read -r line1; do
        while IFS= read -r line2; do
        printf '%s.%sn' "$line1" "$line2"
        done <"$2"
        done <"$1"
        }


        Sample usage:



        $ cart_prod file1.txt file2.txt | sort -r
        cc.site.com
        cc.site3.com
        cc.site2.com
        bb.site.com
        bb.site3.com
        bb.site2.com
        aa.site.com
        aa.site3.com
        aa.site2.com






        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited Jan 13 at 11:32

























        answered Jan 12 at 11:08









        fra-sanfra-san

        22614




        22614






























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