cat ./test.sh 

#!/bin/bash

​

UNAME=${1} #set arg to var UNAME

if [ -z ${UNAME} ]; then #if no argument is provided; then display this

    echo "Not enough arguments provided."

    echo "USAGE: $0 <user_name>" 

    exit 1

fi

if grep ${UNAME} /etc/passwd >/dev/null; then #if UNAME exists then display info below

    echo "-------------------------------------------"

    echo "Username:       $(awk -F ':' -v uname=${UNAME} '$0 ~ uname {print $1}' /etc/passwd)"

    echo "User ID (UID):  $(awk -F ':' -v uname=${UNAME} '$0 ~ uname {print $3}' /etc/passwd)"

    echo "Group ID (GID): $(awk -F ':' -v uname=${UNAME} '$0 ~ uname {print $4}' /etc/passwd)"

    echo "User info:      $(awk -F ':' -v uname=${UNAME} '$0 ~ uname {print $5}' /etc/passwd)"

    echo "Home directory: $(awk -F ':' -v uname=${UNAME} '$0 ~ uname {print $6}' /etc/passwd)"

    echo "Command shell:  $(awk -F ':' -v uname=${UNAME} '$0 ~ uname {print $7}' /etc/passwd)"

    echo "-------------------------------------------"

else #if UNAME is nonexistant then display this error message

    echo "-------------------------------------------"

    echo "\"${UNAME}\" does not exist."

    echo "-------------------------------------------"

fi