Linux shell实战（ipcs工具）

#!/bin/bash

WHOAMI=`whoami`

if [ $# -lt "1" ]
then
    echo ‘[程序名] [操作对象]‘
    exit 0
fi

#需要两个参数，参数一：起始行，参数二:结束行,参数三：操作对象
function seddata
{
    for numx in `ipcs | sed -n ${1},${2}p | sed -n /${WHOAMI}/p | awk ‘{print $2}‘`
    do
        ipcrm ${3} ${numx}
    done
}

function startp
{
    case $1 in
    "shm")
            START=`ipcs | sed -n ‘/shmid/=‘`
            START=`expr $START + 1`
            END=`ipcs | sed -n ‘/Semaphore/=‘`
            END=`expr $END - 2`
            #实际上，直接匹配空行会更简单，这里是为了学习目的
            #END="/^$/"
            echo "start=$START;end=$END"
            seddata $START $END shm
        ;;
    "sem")
        START=`ipcs |sed -n ‘/semid/=‘`
        START=`expr $START + 1`
        END=`ipcs | sed -n ‘/Message/=‘`
        END=`expr $END - 2`
        seddata $START $END sem
    ;;
    "msq")
        START=`ipcs | sed -n ‘/msqid/=‘`
        START=`expr $START + 1`
        END="/^$/"
        seddata $START $END msq
    ;;
    *)
            echo "错误的参数！"
        ;;
    esac
}

if [ "$1" = "all" ]
then
    startp shm
    startp sem
    start msq
else
    startp $1
fi

echo "脚本执行成功！"