Loop through a file with colon-separated strings

Question

I have a file that looks like this:

work:week:day:england:
work1:week:day:sweden:
work2:week:day::
..... 

Each time I loop through the list I w

Answer 1

You can use just bash for this: set IFS (internal field separator) to : and this will catch the fields properly:

while IFS=":" read -r a b c country
do
  echo "$country"
done < "file"

This returns:

england
sweden

This way you will be able to use $a for the first field, $b for the second, $c for the third and $country for the forth. Of course, adapt the number and names to your requirements.

All together:

while IFS=":" read a b c country
do
   if [[ "$country" == "england" ]]; then
      echo "this user works in England"
   else
      echo "You do not work in England"
   fi
done < "file"

Answer 2

Just do the whole thing in awk:

awk -F: '$4=="england"{print "this user works in England";next}
         {print "You do not work in England"}' file

Set the field separator to a colon. If the fourth field is "england", print the first message. next skips to the next line. Otherwise, print the second message.

The fields on each line are accessible by $1, $2, etc. so you can use the data in each field within awk to do whatever you want. The field is read line by line automatically, so there's no need to write your own while read loop.