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pathmunge /etc/profile

pathmunge () {    case ":${PATH}:" in        *:"$1":*)            ;;        *)            if [ "$2" = "after" ] ; then                PATH=$PATH:$1            else                PATH=$1:$PATH            fi    esac}

把参数添加进去环境变量,如果已经存在则不添加

pathmunge () {        if ! echo $PATH | /bin/egrep -q "(^|:)$1($|:)" ; then           if [ "$2" = "after" ] ; then              PATH=$PATH:$1           else              PATH=$1:$PATH           fi        fi}

这个函数不知道是什么时候的版本的,不过新版本的函数效率更高

 

 

#我的环境变量是/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/test/binpathmunge () {    case ":${PATH}:" in        :/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/test/bin:)            echo "就是在环境变量前后添加:";;        #不是正则表达式 任意字符:参数1:任意字符        *:"$1":*)            echo "true";;        *)            if [ "$2" = "after" ] ; then                PATH=$PATH:$1            else                PATH=$1:$PATH            fi    esac}pathmunge

 

pathmunge /etc/profile