userinfo

#!/usr/bin/env zsh
# 
# Show information for a user
# 
# Uses getent(1), so it should also work if you use Kerberos/LDAP/AD/...
#
# File syntax (at least if using regular /etc/passwd and /etc/group files):
# 
#   passwd -> (1)    (2)(3)  (4) (5)           (6)           (7)
#             malte70:x:1000:985:Malte Bublitz:/home/malte70:/usr/bin/zsh
#   group  -> (1)  (2)(3) (4)
#             wheel:x:998:malte70,bofh
# 

SCRIPT_NAME="$(basename $0)"
SCRIPT_VERSION="0.20220226"

source $(dirname $0)/_base.inc.sh



# 
# Usage info
# 
usage() {
	echo "Usage:"
	echo "  $SCRIPT_NAME"
	echo "  $SCRIPT_NAME [--version|--help]"
	echo "  $SCRIPT_NAME [--figlet] <username> [<username2> ...]"
	echo
	echo "Options:"
	echo "  --version -V  Show the version and exit"
	echo "  --help    -h  Show this help and exit"
	echo "  --figlet  -F  Display output using figlet"
	echo
	echo "If no user names are passwd as an argument, \$USER is used."
	echo
}

# 
# Parse arguments
#
CFG_FIGLET=0             # Pass results to figlet?
CFG_FIGLET_FONT="small"  # figlet font - hard coded at the moment :-(
CFG_DASHDASH=0           # -- given: interpret everything as a user name, even if the first character is a dash (-)
CFG_USERS=()             # Users to display information for
DEBUG=${DEBUG:-0}        # Debug mode (can also get set specified using the environment)
while [[ $# -gt 0 ]]; do
	if [[ "$1" == "--help" || "$1" == "-h" ]]; then
		version
		usage
		exit 0
		
	elif [[ "$1" == "--version" || "$1" == "-V" ]]; then
		version
		exit 0
		
	elif [[ "$1" == "--figlet" || "$1" == "-F" ]]; then
		# Using -F instead of -f since -f is usually used to specify
		# a file to operate on
		CFG_FIGLET=1
		
	elif [[ "$1" == "--debug" ]]; then
		# "Easter Egg" - undocumented swith
		DEBUG=1
		
	elif [[ "$1" == "--" ]]; then
		CFG_DASHDASH=1
		
	elif [[ "${1:0:1}" == "-" && $CFG_DASHDASH -ne 1 ]]; then
		message_error "Unknown argument: $1"
		exit 1
		
	else
		CFG_USERS+=$1
		
	fi
	
	shift
	
done

# 
# No user names given - fall back to $USER
# 
if [[ ${#CFG_USERS[@]} -eq 0 ]]; then
	message_info "No username given as an argument - falling back to \$USER"
	CFG_USERS+=$USER
	
fi


# 
# Arguments and options parsed - time for some debugging info!
# NOTE: Array output only works with $()! WHY?!?
# 
message_debug "CFG_FIGLET      = $CFG_FIGLET"
message_debug "CFG_FIGLET_FONT = $CFG_FIGLET"
message_debug "CFG_USERS       = ( $(echo ${CFG_USERS[@]}) )"


# 
# Get information for a single user
# 
user_info() {
	_user=$1
	
	echo -n "User: $_user (#"
	getent passwd $_user | cut -d: -f3 | tr -d "\n"
	echo ")"
	
	echo -n "Real name: "
	getent passwd $_user | cut -d: -f5
	
	echo -n "Groups: "
	getent group | grep $_user | cut -d: -f1 | sort | tr "\n" " " | sed "s/$/\n/"
	
	echo -n "Home: "
	getent passwd $_user | cut -d: -f6
	
	echo -n "Shell: "
	getent passwd $_user | cut -d: -f7
	
}

# 
# Display results, either using normal output or figlet
# 
output() {
	_output=""
	while read _l; do
		_output+="$_l\n"
	done
	if [[ $CFG_FIGLET -ne 1 ]]; then
		echo -n $_output
		
	else
		echo -n $_output | figlet -f $CFG_FIGLET_FONT -t
		
	fi
}

# 
# Show information for all users in $CFG_USERS
# 
for _user in ${CFG_USERS[@]}; do
	if [[ ${#CFG_USERS[@]} -ne 1 ]]; then
		# Show a markdown-style heading if multiple users passed
		echo "# userinfo $_user" | output
	fi
	
	message_debug "Showing info for $_user:"
	user_info $_user | output
	
done