检查rpm包是否安装

需要安装一个gitlib，又不想把所有的包在更新一遍就写了一个脚本

[root@localhost ~]# cat check_yum.sh 
#!/bin/bash

line="readline readline-devel ncurses-devel gdbm-devel glibc-devel tcl-devel openssl-devel curl-devel expat-devel db4-devel byacc sqlite-devel libyaml libyaml-devel libffi libffi-devel libxml2 libxml2-devel libxslt libxslt-devel libicu libicu-devel system-config-firewall-tui redis sudo wget crontabs logwatch logrotate perl-Time-HiRes git cmake libcom_err-devel.i686 libcom_err-devel.x86_64 nodejs cmake libicu-devel libicu openssl openssl-devel"
for i in $line;
do
    $(yum list|grep $i)
    if [ $? -gt 0 ];then
        echo $i >> /root/yumlist.txt
    fi
done