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split files using awk (or similar)

All,

I have a huge file like this:

aaa 222 444 rrr
aaa 234 123 lop
bbb 234 234 kio
bbb 567 345 jjj
ccc 765 567 ghj
ccc 544 678 fre
ccc 444 789 der

I basically need to split the file in a way that:

file aaa.txt shall contain only rows where the first field is aaa:
aaa 222 444 rrr
aaa 234 123 lop

file bbb.txt shall contain only rows where the first field is bbb:
bbb 234 234 kio
bbb 567 345 jjj

etc, etc.

I am sure this is simple and can be done using awk or c-shell script .........

many thanks,
Luca

I don't know c-shell nor awk, but in bash :

Code:

while read line; do

    pre=`echo $line | cut -d' ' -f1`

    echo $line >> $pre.txt

done < file.txt

where file.txt is your huge file