123 lines
2.9 KiB
Bash
123 lines
2.9 KiB
Bash
#!/bin/bash
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# Обработка аргументов через getopts
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LOG_FILE=""
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ERR_FILE=""
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SHOW_USERS=0
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SHOW_PROCESSES=0
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SHOW_HELP=0
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# Функция отображения справки
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display_help() {
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echo "Usage: $0 [options]."
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echo "Options:"
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echo " -u, --users Display a list of users and their home directories"
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echo " -p, --processes Display a list of running processes"
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echo " -l, --log PATH Redirect output to a specified file"
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echo " -e, --errors PATH Redirect error output to a specified file"
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echo " -h, --help Show this message and terminate"
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}
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# Проверка доступности пути
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check_path() {
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local path="$1"
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touch "$path" 2>/dev/null
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if [ $? -ne 0 ]; then
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echo "Error: Cannot write to $path" >&2
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return 1
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fi
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return 0
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}
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# Функция для вывода списка пользователей
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list_users() {
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awk -F: '{print $1, $6}' /etc/passwd | sort
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}
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# Функция для вывода списка процессов
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list_processes() {
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ps -eo pid,comm --sort=pid
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}
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# Ручная обработка аргументов для раннего перенаправления
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for ((i = 1; i <= $#; i++)); do
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if [[ ${!i} == "-e" ]]; then
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next=$((i + 1))
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ERR_FILE=${!next}
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break
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fi
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done
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# Настройка вывода ошибок
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if [[ -n "$ERR_FILE" ]]; then
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if ! check_path "$ERR_FILE"; then
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exit 1
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fi
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echo "Redirecting errors to $ERR_FILE" >&2
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exec 2>"$ERR_FILE"
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fi
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# Парсинг аргументов через getopts
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while getopts ":hupl:e:" opt; do
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case "$opt" in
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h)
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SHOW_HELP=1
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;;
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u)
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SHOW_USERS=1
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;;
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p)
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SHOW_PROCESSES=1
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;;
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l)
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LOG_FILE="$OPTARG"
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;;
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e)
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ERR_FILE="$OPTARG"
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;;
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*)
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echo "Invalid option: -$OPTARG" >&2
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display_help
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exit 1
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;;
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esac
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done
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# Основная логика
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main() {
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if [[ $SHOW_HELP -eq 1 ]]; then
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display_help
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exit 0
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fi
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# Настройка вывода в лог-файлы
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if [[ -n "$LOG_FILE" ]]; then
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if ! check_path "$LOG_FILE"; then
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exit 1
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fi
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exec 1>"$LOG_FILE"
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fi
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# Выполнение запрошенных действий
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if [[ $SHOW_USERS -eq 1 && $SHOW_PROCESSES -eq 1 ]]; then
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echo "Error: Cannot use both -u and -p options simultaneously." >&2
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display_help
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exit 1
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fi
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if [[ $SHOW_USERS -eq 1 ]]; then
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echo "USER HOME"
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list_users
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elif [[ $SHOW_PROCESSES -eq 1 ]]; then
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list_processes
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else
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echo "Error: No action specified." >&2
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display_help
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exit 1
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fi
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}
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# Вызов основной функции
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main
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