How to split a list by comma not space

Question

I want to split a text with comma   not space  in for foo in list  Suppose I have a CSV file CSV File with following text inside it   Hello World Questions Answers bash shell script       I used following code to split it into several words   for word in   cat CSV File   sed -n 1 p    tr       n   do echo  word done   It prints   Hello World Questions Answers bash shell script   But I want it to split the text by commas not spaces   Hello World Questions Answers bash shell script   How can I achieve this in bash

User · Answer

kent   echo  Hello World Questions Answers bash shell script  awk -F    for  i 1 i lt  NF i   print  i   Hello World Questions Answers bash shell script

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You can use   cat f csv   sed  s     g     awk   print  1        4     or  echo  Hello World Questions Answers bash shell script    sed  s     g     awk   print  1        4     This is the part that replace comma with space  sed  s     g

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I think the canonical method is   while IFS   read field1 field2 field3 field4 field5 field6  do    do stuff done  lt  CSV file   If you don t know or don t care about how many fields there are   IFS   while read line  do     split into an array   field    line     for word in    field       do echo   word   done      or use the positional parameters   set --  line   for word in       do echo   word   done  done  lt  CSV file

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Set IFS to     sorin sorin    IFS      for i in  echo  Hello World Questions Answers bash shell script    do echo  i  done Hello World Questions Answers bash shell script sorin sorin

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Read  http   linuxmanpages com man1 sh 1 php   amp  http   www gnu org s hello manual autoconf Special-Shell-Variables html     IFS    The Internal Field Separator that is used for word splitting   after expansion and to split lines into words with the  read                 builtin command   The default value is         IFS is a shell environment variable so it will remain unchanged within the context of your Shell script but not otherwise  unless you EXPORT it   ALSO BE AWARE  that IFS will not likely be inherited from your Environment at all   see this gnu post for the reasons and more info on IFS     You re code written like this   IFS     for word in   cat tmptest   sed -n 1 p    tr       n    do echo  word  done    should work  I tested it on command line   sh-3 2 IFS     sh-3 2 for word in   cat tmptest   sed -n 1 p    tr       n    do echo  word  done  World Questions Answers bash shell script

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Using a subshell substitution to parse the words undoes all the work you are doing to put spaces together   Try instead   cat CSV file   sed -n 1 p    tr       n    while read word  do     echo  word done   That also increases parallelism  Using a subshell as in your question forces the entire subshell process to finish before you can start iterating over the answers  Piping to a subshell  as in my answer  lets them work in parallel  This matters only if you have many lines in the file  of course

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Create a bash function  split on commas       local IFS     local WORD LIST   1    for word in    WORD LIST       do     echo   word    done    split on commas  this is a list    while read item  do     Custom logic goes here   echo Item    item  done       this generates the following output   Item  this Item  is a Item  list    Note  this answer has been updated according to some feedback

[linux] How to split a list by comma not space

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