#!/bin/sh -e
#
#    col1..col9 - handy hack to print a column from standard in
#
#    Copyright (C) 2010 Dustin Kirkland <kirkland@ubuntu.com>
#
#    Authors:
#        Dustin Kirkland <kirkland@ubuntu.com>
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Installed as col1, col2, ... : the column number comes from the name we
# were invoked by.  It is passed to awk as a variable, never spliced into
# the program text, and it has to be a number.
n=${0##*/}
n=${n#col}
case "$n" in
    ""|*[!0-9]*)
        echo "ERROR: $0 must be invoked as colN, where N is a column number" >&2
        exit 1
    ;;
esac
if [ $# -gt 0 ]; then
    sep="$1"
    shift || true
    exec awk -F "$sep" -v n="$n" -- '{print $n}' "$@"
fi
exec awk -v n="$n" -- '{print $n}' "$@"
