如果安装了一些软件，我如何签入bash脚本？

Question

我想检查一个软件的列表，如果它已经安装或没有安装。如果没有，则应该显示它，脚本应该中止/退出。如果我只执行一次脚本，输出应该如下所示：

  wget is not installed
  telnet is not installed

目前的情况如下：

  wget is not installed

再次执行脚本..。

  telnet is not installed

如果未安装当前检查的软件，当前脚本将检查已安装的软件并中止/存在。这不太好，因为您必须多次运行脚本才能识别和检查是否安装了每个软件：

  LINUX_DISTRIBUTATION=$(grep -Eo "(Debian|Ubuntu|RedHat|CentOS)" /etc/issue)

  # Debian / Ubuntu
  if [ -f /etc/debian_version ] || [ "$LINUX_DISTRIBUTATION" == "Debian" ] || [ "$LINUX_DISTRIBUTATION" == "Ubuntu" ]; then
          declare -a NEEDED_SOFTWARE_LIST=(bash rsync wget grep telnet sed)

          for SOFTWARE in ${NEEDED_SOFTWARE_LIST[@]}; do
                  dpkg -l | grep -i $SOFTWARE | head -1 | if [[ "$(cut -d ' ' -f 1)" != "ii" ]]; then
                          echo -e "[ ${Red}FAILED ${RCol}]\t$SOFTWARE is NOT installed completely! Please install it...\n";
                          exit 1;
                  fi
          done
  # RedHat / CentOS
  elif [ -f /etc/redhat-release ] || [ "$LINUX_DISTRIBUTATION" == "RedHat" ] || [ "$LINUX_DISTRIBUTATION" == "CentOS" ]; then
          declare -a NEEDED_SOFTWARE_LIST=(bash rsync wget grep telnet sed)

          for SOFTWARE in ${NEEDED_SOFTWARE_LIST[@]}; do
                  if [[ "$(rpm -q $SOFTWARE)" == "package $SOFTWARE is not installed" ]]; then
                          echo -e "[ ${Red}FAILED ${RCol}]\t$SOFTWARE is NOT installed completely! Please install it...\n";
                          exit 1;
                  fi
          done
  else
          echo "[ ${Red}FAILED ${RCol}]\tYour system is currently not supported by this script.";
          exit 1;
  fi

我也认为，我的解决方案不是最好的。有人能调整一下吗？谢谢！)

提示:我声明了变量"NEEDED_SOFTWARE_LIST“两次，因为我认为我需要两个软件列表的”数组“，因为有些发行版需要另一个软件包。

Answer 1

如果安装了软件包，而不是简单地检查某些实用程序的可用性，为什么要执行一个可怕的测试？

SCRIPTNAME="${0##*/}"

warn() {
    printf >&2 "$SCRIPTNAME: $*\n"
}

iscmd() {
    command -v >&- "$@"
}

checkdeps() {
    local -i not_found
    for cmd; do
        iscmd "$cmd" || { 
            warn $"$cmd is not found"
            let not_found++
        }
    done
    (( not_found == 0 )) || {
        warn $"Install dependencies listed above to use $SCRIPTNAME"
        exit 1
    }
}

checkdeps wget rsync realpath

但是，如果要检查包是否安装在Debian上，请替换此噩梦。

dpkg -l | grep -i $SOFTWARE | head -1 | if [[ "$(cut -d ' ' -f 1)" != "ii" ]]; then

使用

if dpkg -l $SOFTWARE; then