通过单行检查安装的linux包服务

Question

我想在一行中使用rpm命令检查是否安装了特定的Linux软件包。然而，作为目前的服务，它总是给我一个积极的结果，即使没有安装httpd，你能在这里指出问题吗？

rpm -qa httpd && echo "service present" || echo " service not present"

Answer 1

通过替换<PACKAGE_NAME>使用以下内容

更短

rpm -q <PACKAGE_NAME> && echo "service present" || echo "service not present"

更长

rpm -qa <PACKAGE_NAME> | grep <PACKAGE_NAME> && echo "service present" || echo "service not present"

示例：

rpm -qa httpd | grep httpd && echo "service present" || echo "service not present"

# Output
[root@bfa3155b8feb /]# rpm -qa httpd | grep httpd && echo "service present" || echo "service not present"
service not present