Delete first column of csv file

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.