[SOLVED] appending number at the end of string, recursively

udiubu · 05-15-2012, 01:47 PM

Hi guys,

very simple recursion needed:

I have 48 strings, and I would like to append at the end of each string the numbers from 01 to 48. In the specific:

for i in aaa bbb ccc ddd ...(until string 48); do

echo "${i}_???"

done

What should I put in place of ??? in order to have:

aaa_01
bbb_02
ccc_03
...

or you have any other idea?

Any suggestion would be highly appreciated!

Thank you very much.

Sincerely,

Udiubu

colucix · 05-15-2012, 02:06 PM

Code:

for i in aaa bbb ccc blah blah
do
  ((n++))
  echo ${i}_$(printf "%02d" $n)
done

or

Code:

echo aaa bbb ccc blah blah | awk 'BEGIN{RS=" "}{printf "%s_%02d\n", $0, NR}'

suicidaleggroll · 05-15-2012, 02:09 PM

Edit: colucix beat me to it

udiubu · 05-15-2012, 02:16 PM

WOW COLUCIX thanks so much!

If you don't mind could you please explain:

printf "%02d"

Thanks again, it works!

Udiubu

suicidaleggroll · 05-15-2012, 02:18 PM

the %02d is a format code for the print, it forces it to print out the number in two digits, zero padding if necessary. Otherwise it would print "1", instead of "01".

udiubu · 05-15-2012, 02:22 PM

Great! Thanks!