Summary of common shell script commands for later use.

#!/bin/sh#for exm to test# ./check.sh 12 36 25 12 453 1 2 3  RETVAL=0SRRVER_START=1SRRVER_STOP=2DNS_STATUS=1dnsCheck(){        while     test "x`pidof  dnsmasq`" != x ;  do                echo "check  DNS status...................."                sleep 1                break        done}globaCheckFun(){         while true  ;  do                 dnsCheck                 echo "check  true"                 sleep  1         done}if [ -n "`ps|grep -v "grep"|grep ppp*`" ]; then echo "this string is not empty"elseecho "empty"fi#################################################################tmpdir=/tmppppoeId=$tmpdir/ppp0.pidecho  $pppoeIdif [ -f $pppoeId ] ;then    echo "is a file and exist"elseecho "not a file"fiif test "x`pidof  "$1"`" != x; thenecho "dnsmasq is running"elseecho "dnsmasq is stoped"ficase "$1" in        dns)        # do your work        echo "$1"        ;;        pppoe)         echo "$1"         ;;esac#################################################################echo "$@"echo "$*"start=`date +%s`sum=0       for par in "$@"do#  sum=$(( $par + $sum ))sum=$[$par + $sum ]echo $sumdone        endtime=`date +%s`usedtime=$(( endtime -start ))echo "usedtime:$usedtime"echo "parameter num: $#"for par in "$*"           doecho $pardone#ls  sdlfsldkl  2>error#make BOARD_TYPE=db12x BUILD_TYPE=jffs2 BUILD_CONFIG=_ap123  >uboot_mainline.txt 2>&1echo `date +%Y-%m-%d-%T`curretdate=$(date +%Y-%m-%d-%T)echo $curretdate#################################################################if [ $? -eq 0 ];  thenecho "cmd execute ok"elseecho " cnd executed failed"filine="a;b;c;d;e;f;h;j;k"oldifs=$IFSIFS=";"for itme in $line doecho  -en "$itme\t"doneecho IFS=$oldifs#################################################################va=10if [ $va -eq 11 ];  thenecho "equel ="elif  [ $va -gt 10 ];  thenecho " >"elif  [ $va -lt 10 ];  thenecho " <"elif  [ $va -ge 10 ];  thenecho " >="elif  [ $va -le 10 ];  thenecho " <="elseecho " other"fi#!/bin/shif [ "$1" = "" ] ;thenecho " usage./parse_wifi_vap.sh vap/wifiN  parse_file  "exit 0fiparse_wifi_vap(){    iwconfigcmd="essid;mode;freq;channel;bit;rate;enc;key;power;nickname;nwid;ap;txpower;sens;retry;rts;frag;modulation;commit"     line=""    start=0;    cmd=""    value=0    temp=""    while read -r line ;do    if [ "$start" = 0 ];then    if [ "$line" = "<"$1 ];then    start=1    continue    fi  elif [ "$start" = 1 ];then    if [ "$line" = $1">" ];then    start=0    break    fi      parameter=`echo $line | cut -d "=" -f 1`      value=`echo $line | cut -d "=" -f 2`      temp=`echo "$iwconfigcmd"|grep "$parameter"`      if [ -n "$temp" ];then#   `iwconfig $1 $parameter $value`   cmd="iwconfig"        else#   `iwpriv   $1 $parameter $value`   cmd="iwpriv"      fi      `$cmd $1 $parameter $value`      echo "cmd:\"$cmd $1 $parameter $value \" exeResult:$?"    fi    done < $2}WMMFILE=wireless_wmm.conf# # ath0  AC  wmm/acm/aifsn/cwmax/cwmax/noackpolicy/txoplimit value#iwpriv athN acm AC Mode value# iwpriv ath0 aifs 0 0 3# iwpriv ath0 get_aifs 0 0 1# ath0      get_aifs:3 parse_wmm(){        start=0        start1=0        tmp=0value=0        linenum=0;        while read -r line ;do                linenum=$(($linenum+1))                if [ "$start" = 0 ];then                        if [ "$line" = "<_$1_" ];then                                start=1                                continue                        fi              elif [ "$start" = 1 ];then                        if [ "$line" = "_$1_>" ];then                                start=0                                break                        fi                        tempstr=`echo $line | grep "$2"`                        if [ "$tempstr"  = "<""$2" ] ;then#                                 echo "start_line:" $1 $2 $line" "                                  start1=1                        fi                        if [ "$start1" = 1 ];then                            if [ "$tempstr" = "$2"">" ] ;then                                    start1=0                                    echo "error:not find $1 $3 in $WMMFILE"                                    break;                            fi                            tmp=`echo $line | cut -d "=" -f 1`                            tempstr=`echo $3 | cut -d "=" -f 1`                            if [ "$tmp" = "$tempstr" ];then  value=`echo $line | cut -d "=" -f 2`  echo "iwpirv $1 $3 "AC_$2" 0 $value"                                break;                            fi                        fi                fi        done < $WMMFILE# cat $WMMFILE}parse_wmm_file(){dev=$1AC=$2element=while [ $# -gt 0 ];do#  echo "\$#=$#  $@"element=$3if [ "$element" = "" ];then                        break                else    parse_wmm $dev $AC $element                    shiftfidone}#parse_wifi_vap $@parse_wmm_file $@

echo "$0 vap0 -q BK cwmax=1000"

mkwmmconf(){# echo "parameter:$@"if test -e $WMMFILE;thentmp=`cat $WMMFILE | grep "##conf"`if [ "$tmp" = "" ];thenrm -rf $WMMFILEfifiif ! test -e $WMMFILE ; thenecho "##conf" > $WMMFILEfitmp=`cat $WMMFILE | grep "<_$1_"`if [ "$tmp" = "" ];then        sed -i '/##end/d'  $WMMFILEecho "----------------------add new :$1---------------------------"echo "<_$1_" >> $WMMFILEecho "<BE" >> $WMMFILEecho "BE>" >> $WMMFILEecho "<BK" >> $WMMFILEecho "BK>" >> $WMMFILEecho "<VI" >> $WMMFILEecho "VI>" >> $WMMFILEecho "<VO" >> $WMMFILEecho "VO>" >> $WMMFILEecho "_$1_>" >> $WMMFILE# cat "$WMMFILE"fitmp=`cat $WMMFILE | grep "##end"`if [ "$tmp" = "" ];thenecho "##end" >> $WMMFILEfi#echo "*****************************************************************************************"#cat $WMMFILE#echo "*****************************************************************************************"start=0start1=0tmp=0linenum=0;while read -r line ;dolinenum=$(($linenum+1))if [ "$start" = 0 ];thenif [ "$line" = "<_$1_" ];thenstart=1continuefi      elif [ "$start" = 1 ];thenif [ "$line" = "_$1_>" ];thenstart=0echo "end line:"$line"  $1"breakfitempstr=`echo $line | grep "$2"`if [ "$tempstr"  = "<""$2" ] ;then#     echo "start_line:" $1 $2 $line" "  start1=1        fiif [ "$start1" = 1 ];then    if [ "$tempstr" = "$2"">" ] ;then    start1=0#        echo " end_line:"$line"  $1 $3"#     sed -i '/'"$line"'/i\'"$3" $WMMFILE // this cmd will add $3 to $line in all file    sed -i  $linenum'i\'"$3" $WMMFILE    echo "insert new element:$1 $3 before line:$linenum to $WMMFILE"    break;    fi    tmp=`echo $line | cut -d "=" -f 1`    tempstr=`echo $3 | cut -d "=" -f 1`    if [ "$tmp" = "$tempstr" ];thentmp=`echo $line | cut -d "=" -f 2`tempstr=`echo $3 | cut -d "=" -f 2`if [ "$tmp" != "$tempstr" ];then  sed -i  "$linenum"d $WMMFILE  sed -i  $linenum'i\'"$3" $WMMFILE  echo "replace $1 $2: $line to $3 $WMMFILE "   fibreak;    fififidone < $WMMFILE# cat $WMMFILE}

Scripts used at work: