Linux shell实战（ipcs工具）

#!/bin/bash
if [ $# -lt  -o $# -gt  ]
then
    echo "参数个数不正确！"
    exit -
fi

WHOAIM=`whoami`

function release
{
    if [ $ -le $ ]
        then
                for id in `ipcs | sed -n $,$2p | grep "${WHOAMI}" | \
                awk '{print $2}'`
        do
            ipcrm $ $id
        done
        fi
}

function releasebyid
{
    ipcrm $ $
}

function judgetype
{
    case $ in
    "shm")
        start=$((`ipcs | sed -n '/shmid/='`+))
        end=$((`ipcs | sed -n '/Semaphore/='`-))
        if [ $# -eq  ]
        then
            releasebyid "-m" $
        else
            release $start $end "-m"
        fi
        ;;
    "sem")
        start=$((`ipcs | sed -n '/semid/='`+))
        end=$((`ipcs | sed -n '/Message/='`-))
        if [ $# -eq  ]
        then
            releasebyid "-s" $
        else
            release $start $end "-s"
        fi
        ;;
    "msg")
        start=$((`ipcs | sed -n '/msqid/='`+))
        end=$((`ipcs | sed -n '$='`-))
        if [ $# -eq  ]
        then
            releasebyid "-q" $
        else
        release $start $end "-q"
        fi
        ;;
    *)
        echo "错误的参数 [shm] [sem] [msg] [all]"
        exit
        ;;
    esac
}

if [ "$1" = "all" ]
then
    if [ $# -eq  ]
    then
        echo "[all]不可以有第二个参数！"
        exit
    else
        judgetype "shm"
        judgetype "sem"
        judgetype "msg"
    fi
else
    judgetype $ $
fi

echo "shell执行成功！"