linux shell script split string put them in an array then loop through them

Question

Possible Duplicate    Split string based on delimiter in Bash        In a bash script how do I split string with a separator like   and loop through the resulting array

User · Answer

sentence  one two three  a    sentence    while   -n    a     do     echo   a          a   a     done

User · Answer

If you don t wish to mess with IFS  perhaps for the code within the loop  this might help   If know that your string will not have whitespace  you can substitute the     with a space and use the for in construct     local str for str in   STR         do     echo       str    done   But if you might have whitespace  then for this approach you will need to use a temp variable to hold the  rest  like this    local str rest rest  STR while   -n   rest      do    str   rest         Everything up to the first          Trim up to the first     -- and handle final case  too         rest       rest         amp  amp  rest     rest   rest        echo       str    done

User · Answer

Here is an example code that you may use     STR  String 1 2 3    for EACH in  echo   STR    grep -o -e           do     echo  Found     EACH     done   grep -o -e         will select anything that is not      therefore spliting the string by       Hope that help

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You can probably skip the step of explicitly creating an array     One trick that I like to use is to set the inter-field separator  IFS  to the delimiter character  This is especially handy for iterating through the space or return delimited results from the stdout of any of a number of unix commands   Below is an example using semicolons  as you had mentioned in your question    export IFS     sentence  one two three  for word in  sentence  do   echo   word  done   Note  in regular Bourne-shell scripting setting and exporting the IFS would occur on two separate lines  IFS  x   export IFS

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Here s a variation on ashirazi s answer which doesn t rely on  IFS  It does have its own issues which I ouline below   sentence  one two three  sentence   sentence       n      change the semicolons to white space for word in  sentence do     echo   word  done   Here I ve used a newline  but you could use a tab   t  or a space  However  if any of those characters are in the text it will be split there  too  That s the advantage of  IFS - it can not only enable a separator  but disable the default ones  Just make sure you save its value before you change it - as others have suggested

[bash] linux shell script: split string, put them in an array then loop through them

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