#! /usr/local/bin/zsh
#
# this file:
#   https://dataswamp.org/~incal/sth/scripts/junior

local passwdf=/etc/passwd
local delim=":"
local prefix="^_"
local fld=1
local usr

if [[ $1 == 'senior' ]]; then
    usr=$(grep -v $prefix $passwdf | tail -n 2 | head -n 1 | cut -d $delim -f $fld)
    [[ $usr != '' ]] && echo "$usr[1].$usr[2,-1]"
else
    usr=$(grep -v $prefix $passwdf | tail -n 1 |             cut -d $delim -f $fld)
    [[ $usr != '' ]] && echo "$usr"
fi