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[BASH] mapping of values from file line into variables

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# 1  
Old 04-20-2009
[BASH] mapping of values from file line into variables
Hello,

I've been struggling with this for some time but can't find a way to do it and I haven't found any other similar thread.

I'd like to get the 'fields' in a line from a file into variables in just one command.

The file contains data with the next structure:
value1;value2;value3;value4;(...);value19

And I need to get these values into variables in order to create a MySql INSERT statement that I will later 'echo' into a file.

I have been able to get the values one by one by means of awk i.e.
for file in $dir/lcc*; do
echo "Processing file: $file"
while read line; do
value1=$(echo $line| awk -F\; '{print $1}')
value2=$(echo $line| awk -F\; '{print $2}')
...

But calling awk 19 times for every line in the file just doesn't seem logical to me and it takes too much time (and CPU).

There must be a simple way to map all value fields into variables, mustn't it?

Thank you very much!!
# 2  
Old 04-20-2009
Assuming the fieldseparator is a semicolon and your fields don't have spaces, you can do something like:

Code:
awk -F\; '{print}' OFS=" " |
while read value1 value2 value3........
do
  # Actions
done

Regards
# 3  
Old 04-20-2009
This variation works with spaces:

Code:
IFS=$'\n'
tr \; \\n |
while read value1 value2 value3 ..............
do
    doSomethingWith $value1
    doSomethingWith $value2
done

# 4  
Old 04-20-2009
Thank you very much for your kind contributions. They helped me a lot, although I couldn't get the 'multiple variable' while to work.

However I found out that by using IFS and 'read -a' the mapping could be done into an array (without the need to use awk).

This is now my code:

Code:
for file in $dir/lcc*; do
  echo "Processing file: $file"
  while read line
  do
    IFS=$'\;'
    read -a val
    if [ "${val[1]}" == "2" ]; then
      echo "ticket 2"
      echo "INSERT INTO trigger (VALUE1, VALUE3, VALUE4, VALUE5, VALUE6,\
VALUE7, VALUE8, VALUE9, VALUE10, VALUE11, VALUE12, VALUE13,\
VALUE14, VALUE15) VALUES ('${val[0]}','${val[2]}','${val[3]}','${val[4]}',\
'${val[5]}','${val[6]}','${val[7]}','${val[8]}','${val[9]}','${val[10]}',\
'${val[11]}','${val[12]}','${val[13]}','${val[14]}');" >> mysql.txt
    fi
  done < $file
done

# 5  
Old 04-21-2009
There was a bug in my code Smilie The correct one is:

Code:
for file in $dir/lcc*; do
  echo "Processing file: $file"
  IFS=$'\;'
  while read -a val
  do
    if [ "${val[1]}" == "2" ]; then
      echo "ticket 2"
      echo "INSERT INTO trigger (VALUE1, VALUE3, VALUE4, VALUE5, VALUE6,\
VALUE7, VALUE8, VALUE9, VALUE10, VALUE11, VALUE12, VALUE13,\
VALUE14, VALUE15) VALUES ('${val[0]}','${val[2]}','${val[3]}','${val[4]}',\
'${val[5]}','${val[6]}','${val[7]}','${val[8]}','${val[9]}','${val[10]}',\
'${val[11]}','${val[12]}','${val[13]}','${val[14]}');" >> mysql.txt
    fi
  done < $file
done

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