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How can I remove first column with awk?


 
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Top Forums Shell Programming and Scripting How can I remove first column with awk?
# 8  
Old 08-16-2017
You perhaps have other options:-
Code:
sed 's/^.* //' input.txt              # Will give you just the last field, so I'm assuming you only have two.
cut -f2- -d" " input.txt              # Will give you all the columns except the first

perl -e 'foreach (<>) {
   @line=split / /;
   shift @line;
   print join (" ",@line)
}' < input.txt                        # Probably a bit long though (and I'm sure someone has a neater way, I'm new to Perl and just practising really)

More importantly, what do you want to do with the data? I'm assuming that this is not your real data and that you have a purpose in mind.

Is this part of a larger shell script perhaps? If you show us the code so far, we can help you work out a suitable solution.




Kind regards,
Robin

Last edited by rbatte1; 08-16-2017 at 09:56 AM..
This User Gave Thanks to rbatte1 For This Post:
# 9  
Old 08-16-2017
Code:
while read a b
do
   echo "$b"
done < infile

# 10  
Old 08-16-2017
Quote:
Originally Posted by cola
Is it possible to rewrite this code without 1? (using something like print)
Sure, the 1 is geek for {print}.
Code:
awk '{$1=""}{print}' input.txt

or
Code:
awk '{$1=""; print}' input.txt

$2="" would clear the 2nd column.

The following sed works similar but does not leave additional spaces
Code:
sed 's/[[:space:]]*[^[:space:]]\{1,\}[[:space:]]*//1' input.txt

//2 would be the 2nd column.
# 11  
Old 09-23-2017
Quote:
Originally Posted by MadeInGermany
Sure, the 1 is geek for {print}.
Code:
awk '{$1=""}{print}' input.txt

or
Code:
awk '{$1=""; print}' input.txt

$2="" would clear the 2nd column.

The following sed works similar but does not leave additional spaces
Code:
sed 's/[[:space:]]*[^[:space:]]\{1,\}[[:space:]]*//1' input.txt

//2 would be the 2nd column.
After deleting the first column there a leading space. How can I delete the first column with the extra space between first and second column?
# 12  
Old 09-23-2017
If you don't like ALL the other proposals in this thread, try
Code:
awk 'sub("^" $1 FS, _)' file
x
y
z


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