shell參數 傳遞

標籤：

$# 是傳給指令碼的參數個數$0 是指令碼本身的名字$1 是傳遞給該shell指令碼的第一個參數$2 是傳遞給該shell指令碼的第二個參數[email protected] 是傳給指令碼的所有參數的列表$* 是以一個單字串顯示所有向指令碼傳遞的參數，與位置變數不同，參數可超過9個$$ 是指令碼啟動並執行當前進程ID號$? 是顯示最後命令的退出狀態，0表示沒有錯誤，其他表示有錯誤

區別：@*

• 相同點：都是引用所有參數
• 不同點：只有在雙引號中體現出來。假設在指令碼運行時寫了三個參數（分別儲存在12 3）則"*" 等價於 “12 3"（傳遞了一個參數）；而“@" 等價於 "1""2" "$3"（傳遞了三個參數）

 

一個守護指令碼 demon：

####################  VERSION=0.0.4####################!/bin/bash###################################Global parameters#########################################set -x #echo onCUR_DIR=`pwd`VA_LOG_LEVEL="err"VA_RUN_LEVEL="demon"####for record file deleteDEFAULT_DAYS=15RECORD_FILE_PATH=/var/video_recordDEFAULT_FILE_CHECK=1##### unit : GDEFAULT_MINI_SPACE=15PROCESS_NUM=2#CertMS#DarwinStreamingServer#CertMS_Server#Darwin_Server#functions#####################parse argument###################usage(){  echo "######################################"  echo "usage of maintain.sh :"  echo "options  "  echo "-l  : videomon log level [warn , info , err] , default is err"  echo "-m  : videomon run mod[demon , foreground] , default is demon"  echo "-c   : record file delete check! [ 0:not check 1:check , default is 1]"  echo "-n   : [Delete the record files of the n days ago , default is 15 days]"  echo "-d   : [record file path , default is :/var/video_record]"  echo "For example: ./maintain.sh -l info -m foreground -c 1 -n 10 -d /video_record or ./maintain.sh "  echo "-?  : usage info"    echo "######################################"}get_opt(){  while getopts ":?l:m:c:n:d:" optname  do    case "$optname" in    "l")      VA_LOG_LEVEL=$OPTARG      ;;    "m")      VA_RUN_LEVEL=$OPTARG      ;;    "c")      DEFAULT_FILE_CHECK=$OPTARG      ;;    "n")      DEFAULT_DAYS=$OPTARG      ;;    "d")      RECORD_FILE_PATH=$OPTARG      ;;    "?")      usage      exit 0      ;;    *)      # Should not occur      echo "maintain.sh :Unknown error while processing options"      exit 0      ;;    esacdone}######################Video_Monitor clean####################video_monitor_clean(){    for (( i = 0 ; $i < PROCESS_NUM; i++ ));    do        echo $i;        pid_videomon=`ps aux|grep -v grep|grep  "videomon$i" | grep "$"|sed -n ‘1P‘|awk ‘{print $2}‘`        if [ $pid_videomon ]        then            killall -9 videomon$i        fi    done}######################ran_videomon_monitor####################ran_videomon_monitor(){    echo $1   cd $CUR_DIR/bin$1  if [ $VA_RUN_LEVEL == "demon" ]  then    nohup ./videomon$1 -l $VA_LOG_LEVEL -p pid -d &  else    nohup ./videomon$1 -l $VA_LOG_LEVEL -p pid &  fi  echo Start videomon Success!}######################record file check####################record_file_check(){  cd $CUR_DIR  if [ -f record_file_delete.sh ]  then    chmod +x record_file_delete.sh    ###    pid_record_sh=`ps aux|grep -v grep|grep  "record_file_delete.sh" | grep "$"|sed -n ‘1P‘|awk ‘{print $2}‘`    if [ -z $pid_record_sh ]    then      nohup ./record_file_delete.sh -n $DEFAULT_DAYS -d $RECORD_FILE_PATH -s $DEFAULT_MINI_SPACE &    else      echo "record_file_delete.sh is running!"    fi    ###  else    echo "Can not find record_file_delete.sh"    return 0  fi}######################videomon_maintain####################videomon_maintain(){  while true  do    sleep 2    ####Check whether need to delete record files    if [ $DEFAULT_FILE_CHECK -eq 1 ]    then      record_file_check    fi    for (( i = 0 ; $i < PROCESS_NUM; i++ ));    do        echo $i;         pid=`ps aux|grep -v grep|grep  "videomon$i -l $VA_LOG_LEVEL" | grep "$"|sed -n ‘1P‘|awk ‘{print $2}‘`        if [ -z $pid ]        then              ran_videomon_monitor $i        fi    done  done}#################start process###############get_opt [email protected]if [ $? != 0 ]then   echo get_opt unknow options!  exit 1fivideo_monitor_cleanfor (( i = 0 ; $i < PROCESS_NUM; i++ ));do    ran_videomon_monitor $idonevideomon_maintain

 

 

參考http://www.cnblogs.com/kaituorensheng/p/4002697.html

shell參數 傳遞