Delete first column of csv file [duplicate] - bash

Question

This question already has answers here:
awk - how to delete first column with field separator
(5 answers)
Closed 5 years ago.
I would like to know how i can delete the first column of a csv file with awk or sed
Something like this :
FIRST,SECOND,THIRD
To something like that
SECOND,THIRD
Thanks in advance

Answer 1

Following awk will be helping you in same.
awk '{sub(/[^,]*/,"");sub(/,/,"")} 1' Input_file
Following sed may also help you in same.
sed 's/\([^,]*\),\(.*\)/\2/' Input_file
Explanation:
awk ' ##Starting awk code here.
{
sub(/[^,]*/,"") ##Using sub for substituting everything till 1st occurence of comma(,) with NULL.
sub(/,/,"") ##Using sub for substituting comma with NULL in current line.
}
1 ##Mentioning 1 will print edited/non-edited lines here.
' Input_file ##Mentioning Input_file name here.

Answer 2

Using awk
$awk -F, -v OFS=, '{$1=$2; $2=$3; NF--;}1' file
SECOND,THIRD

Answer 3

With Sed
sed -i -r 's#^\w+,##g' test.csv
Grab the begin of the line ^, every character class [A-Za-z0-9] and also underscore until we found comma and replace with nothing.
Adding g after delimiters you can do a global substitution.

Answer 4

Using sed : ^[^,]+, regex represent the first column including the first comma. ^ means start of the line, [^,]+, means anything one or more times but a comma sign followed by a comma.
you can use -i with sed to make changes in file if needed.
sed -r 's/^[^,]+,//' input
SECOND,THIRD