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Old 08-08-2011, 12:21 PM   #1
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How to find the position of the first space in a line?

Hi guys,

I am trying to edit a large bunch of files. Each file has four columns and I want to get rid of the first one, but in each line the number of the first column changes. the number in the first column ranges from 1 digit to 5. For example

1 aaaaa bbbbbb ccccc
23 aaaaa bbbbbb ccccc
15343 aaaaa bbbbbb ccccc

and the desired format would be

aaaaa bbbbbb ccccc
aaaaa bbbbbb ccccc
aaaaa bbbbbb ccccc


Old 08-08-2011, 01:38 PM   #2
David the H.
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Please use [code][/code] tags around your code, to preserve formatting and to improve readability.

You have lots of options for this. The most basic is to use the cut utility.
cut -d " " -f 2- file.txt
It can also be done by either sed or awk, among others, with a simple regular expression.
sed -r 's/^[^ ]+ //' file.txt
awk '{ sub( /^[^ ]+ /,"" ) ; print }' file.txt
Since awk is a field-based interpreter, and you have a small number of fixed fields, you could also simply tell it to print every field except the first, similar to cut.
awk '{ print $2,$3,$4 }' file.txt
sed can edit the file in-place by using its -i option. cut and awk's output would have to be redirected to a temporary file.
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Old 08-08-2011, 02:02 PM   #3
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Thanks David the H.

that work out perfectly in my script.



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