Grep through a \n terminated list of people and phone extensions

gistfile1.sh

# Quick Bash function to lookup telephone extensions. Better if agrep is installed.
# Usage:
# $ tel steve
# 3900 - Steve Challis

# Terminal colour codes
export CYAN="\033[0;36m"
export GREEN="\033[0;32m"

PHONE_LIST='/usr/share/phone-extensions.txt'

tel() {
    local NUMBER=$CYAN
    local TEXT=$GREEN
    if [ ! $1 ]
    then
        # Show all if no argument specified
        cat $PHONE_LIST | less
    else
        # Use agrep if available
        type -p agrep &>/dev/null && grepper="agrep -1" || grepper="grep"
        echo -en "$TEXT"
        echo -e "$grepper -i $* $PHONE_LIST |
            egrep '^[^\*].*' |
            sed 's/\([0-9]\{2,11\}x\{0,4\}\)/$NUMBER\1$TEXT/g'" |
            bash -                                                              
        echo -en "$NO_COLOUR"
    fi
}