Script question

pvpnguyen · 02-29-2008, 07:46 PM

Hello All,

I have a string AAA_BBB-CCC_DDD-1000. Using bash script, how can I extract the number 1000 from the string? Your help is very much appreciated, thank you.

pixellany · 02-29-2008, 08:31 PM

This is pretty vague. Do you always have all letters and then just one group of numbers? To write a good script you have to anticipate all possible combinations.

If you just want to extract a group of 4 numbers anywhere on the line:

sed -r 's/.*([0-9]{4}).*/\1/' filename > newfilename

ghostdog74 · 02-29-2008, 09:28 PM

Quote:

Originally Posted by pvpnguyen

Hello All,

I have a string AAA_BBB-CCC_DDD-1000. Using bash script, how can I extract the number 1000 from the string? Your help is very much appreciated, thank you.

please go to this page, look under "Substring Removal", especially
"${string##substring}". Try the example. you will get what you need.

chrism01 · 03-02-2008, 05:37 PM

A simple soln, assuming input us exactly formatted as per OP

echo AAA_BBB-CCC_DDD-1000|cut -d'-' -f3

pvpnguyen · 03-03-2008, 09:20 AM

Quote:

Originally Posted by chrism01

A simple soln, assuming input us exactly formatted as per OP

echo AAA_BBB-CCC_DDD-1000|cut -d'-' -f3

Hello Chrism01,

Thank you very much for your help. It works with your solution. I can't match the string since it is an input and changes all the time. But the 2 '-'s are always there, so yours works.
Again, thank you all for your answers and supports.