How do I generate empty files, with names randomly taken from an input text file?











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I would like to generate 20 files (empty), each named using a 10 character string chosen randomly from a file "test.txt"(manually generate the file test.txt).



How to do this task?










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    We don't do your homework ... you have to figure that out your self. Or at least show what you have tried, and how it worked / failed.
    – Soren A
    Nov 21 at 9:52






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    We are not here to do your homework for you – what did you try and where do you have problems? Please edit to add further information.
    – dessert
    Nov 21 at 9:53















up vote
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down vote

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I would like to generate 20 files (empty), each named using a 10 character string chosen randomly from a file "test.txt"(manually generate the file test.txt).



How to do this task?










share|improve this question









New contributor




Zarvis is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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  • 5




    We don't do your homework ... you have to figure that out your self. Or at least show what you have tried, and how it worked / failed.
    – Soren A
    Nov 21 at 9:52






  • 3




    We are not here to do your homework for you – what did you try and where do you have problems? Please edit to add further information.
    – dessert
    Nov 21 at 9:53













up vote
-2
down vote

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up vote
-2
down vote

favorite











I would like to generate 20 files (empty), each named using a 10 character string chosen randomly from a file "test.txt"(manually generate the file test.txt).



How to do this task?










share|improve this question









New contributor




Zarvis is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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I would like to generate 20 files (empty), each named using a 10 character string chosen randomly from a file "test.txt"(manually generate the file test.txt).



How to do this task?







bash






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edited Nov 21 at 14:18









abu_bua

3,05381023




3,05381023






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asked Nov 21 at 9:46









Zarvis

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  • 5




    We don't do your homework ... you have to figure that out your self. Or at least show what you have tried, and how it worked / failed.
    – Soren A
    Nov 21 at 9:52






  • 3




    We are not here to do your homework for you – what did you try and where do you have problems? Please edit to add further information.
    – dessert
    Nov 21 at 9:53














  • 5




    We don't do your homework ... you have to figure that out your self. Or at least show what you have tried, and how it worked / failed.
    – Soren A
    Nov 21 at 9:52






  • 3




    We are not here to do your homework for you – what did you try and where do you have problems? Please edit to add further information.
    – dessert
    Nov 21 at 9:53








5




5




We don't do your homework ... you have to figure that out your self. Or at least show what you have tried, and how it worked / failed.
– Soren A
Nov 21 at 9:52




We don't do your homework ... you have to figure that out your self. Or at least show what you have tried, and how it worked / failed.
– Soren A
Nov 21 at 9:52




3




3




We are not here to do your homework for you – what did you try and where do you have problems? Please edit to add further information.
– dessert
Nov 21 at 9:53




We are not here to do your homework for you – what did you try and where do you have problems? Please edit to add further information.
– dessert
Nov 21 at 9:53










2 Answers
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Assuming you already have the strings in test.txt, and they are all 10 characters wide, and they are one per line:



shuf -n 20 test.txt | xargs touch


shuf will shuffle the contents of test.txt and print the first 20 lines, then xargs will take that output and convert it to arguments for touch, which will create files using those arguments.






share|improve this answer








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    Using just the bash, without any external commands:



    mapfile names < test.txt # save filenames in array
    for ((i = 0; i < 20; i++)) # loop 20 times
    do
    ind=$((RANDOM % ${#names[@]})) # take random value less than length of array
    > "${names[$ind]}" # redirection creates empty file
    unset names[$ind] # remove used filename from array
    names=( "${names[@]}" ) # recreate array to remove gaps
    done





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      2 Answers
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      2 Answers
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      up vote
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      down vote













      Assuming you already have the strings in test.txt, and they are all 10 characters wide, and they are one per line:



      shuf -n 20 test.txt | xargs touch


      shuf will shuffle the contents of test.txt and print the first 20 lines, then xargs will take that output and convert it to arguments for touch, which will create files using those arguments.






      share|improve this answer








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        up vote
        2
        down vote













        Assuming you already have the strings in test.txt, and they are all 10 characters wide, and they are one per line:



        shuf -n 20 test.txt | xargs touch


        shuf will shuffle the contents of test.txt and print the first 20 lines, then xargs will take that output and convert it to arguments for touch, which will create files using those arguments.






        share|improve this answer








        New contributor




        JohnDoea is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
        Check out our Code of Conduct.




















          up vote
          2
          down vote










          up vote
          2
          down vote









          Assuming you already have the strings in test.txt, and they are all 10 characters wide, and they are one per line:



          shuf -n 20 test.txt | xargs touch


          shuf will shuffle the contents of test.txt and print the first 20 lines, then xargs will take that output and convert it to arguments for touch, which will create files using those arguments.






          share|improve this answer








          New contributor




          JohnDoea is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.









          Assuming you already have the strings in test.txt, and they are all 10 characters wide, and they are one per line:



          shuf -n 20 test.txt | xargs touch


          shuf will shuffle the contents of test.txt and print the first 20 lines, then xargs will take that output and convert it to arguments for touch, which will create files using those arguments.







          share|improve this answer








          New contributor




          JohnDoea is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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          share|improve this answer



          share|improve this answer






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          answered Nov 21 at 13:38









          JohnDoea

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              up vote
              2
              down vote













              Using just the bash, without any external commands:



              mapfile names < test.txt # save filenames in array
              for ((i = 0; i < 20; i++)) # loop 20 times
              do
              ind=$((RANDOM % ${#names[@]})) # take random value less than length of array
              > "${names[$ind]}" # redirection creates empty file
              unset names[$ind] # remove used filename from array
              names=( "${names[@]}" ) # recreate array to remove gaps
              done





              share|improve this answer








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                up vote
                2
                down vote













                Using just the bash, without any external commands:



                mapfile names < test.txt # save filenames in array
                for ((i = 0; i < 20; i++)) # loop 20 times
                do
                ind=$((RANDOM % ${#names[@]})) # take random value less than length of array
                > "${names[$ind]}" # redirection creates empty file
                unset names[$ind] # remove used filename from array
                names=( "${names[@]}" ) # recreate array to remove gaps
                done





                share|improve this answer








                New contributor




                Bash bros is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                Check out our Code of Conduct.




















                  up vote
                  2
                  down vote










                  up vote
                  2
                  down vote









                  Using just the bash, without any external commands:



                  mapfile names < test.txt # save filenames in array
                  for ((i = 0; i < 20; i++)) # loop 20 times
                  do
                  ind=$((RANDOM % ${#names[@]})) # take random value less than length of array
                  > "${names[$ind]}" # redirection creates empty file
                  unset names[$ind] # remove used filename from array
                  names=( "${names[@]}" ) # recreate array to remove gaps
                  done





                  share|improve this answer








                  New contributor




                  Bash bros is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                  Check out our Code of Conduct.









                  Using just the bash, without any external commands:



                  mapfile names < test.txt # save filenames in array
                  for ((i = 0; i < 20; i++)) # loop 20 times
                  do
                  ind=$((RANDOM % ${#names[@]})) # take random value less than length of array
                  > "${names[$ind]}" # redirection creates empty file
                  unset names[$ind] # remove used filename from array
                  names=( "${names[@]}" ) # recreate array to remove gaps
                  done






                  share|improve this answer








                  New contributor




                  Bash bros is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                  Check out our Code of Conduct.









                  share|improve this answer



                  share|improve this answer






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                  answered Nov 21 at 14:59









                  Bash bros

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                  1




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