#!/bin/bash

#

#

#

sum=0

i=1

while (($i<=100));do

sur=$[i%2]

        if [ $sur -eq 0 ];then

                let i++

        else

                let sum+=i

                let i++

        fi

done

echo $sum

#!/bin/bash

#

#

for ((i=1;i<=9;i++));do

        for ((j=1;j<=i;j++));do

                printf "${i}x${j}=$[i*j]\t"

        done

                printf "\n"

done

#!/bin/bash

#

#

i=1

j=1

while ((i<=9));do

        j=1

    while ((j<=i));do

        printf "${i}x${j}=$[i*j]\t"

        let j++

    done

        let i++

        printf "\n"

done

#!/bin/bash

#

#

min=$RANDOM

max=$min

i=1

while ((i<=10));do

      let i++

      RD=$RANDOM

      echo $RD

   if [ $RD -ge $max ];then

      max=$RD

   else if [ $RD -lt $min ];then

      min=$RD

        fi

   fi

done

echo "maximum is $max"

echo "minimum is $min"

#!/bin/bash

#systeminfo

#20220415

#

echo

echo "**************************HOST systeminfo*****************************"

echo "HOSTNAME:               `hostname`"

echo "IPADDR:             `ifconfig |head -2|tail -1|grep -Eo '([0-9]{1,3}\.){3}[0-9]{1,3}'|head -1`"

echo "OSVERSION:    `cat /etc/redhat-release`"

echo "KERNEL:            `uname -r`"

echo "CPU:    `lscpu | grep "Model name"|tr -s ' '|cut -d":" -f2|head -1`"

echo "MEMORY:               `free -h | tr -s ' '|grep Mem|cut -d' ' -f2`"

echo "DISK               `lsblk | grep "^sda"|tr -s ' ' | cut -d" " -f4`"

echo "***********************************************************************"

#!/bin/bash

#

#Maximum disk space

#USAGE 使用率

#DISKINFO=`df -h | grep "$USAGE"`

USAGE=`df -h |grep -v "Filesystem" |tr -s ' ' |cut -d' ' -f5 |sort -nr|head -1`

DISK=`df -h | grep "$USAGE" | tr -s ' ' | cut -d' ' -f1`

SIZE=`df -h | grep "$USAGE" | tr -s ' ' | cut -d' ' -f2`

USED=`df -h | grep "$USAGE" | tr -s ' ' | cut -d' ' -f3`

AVAIL=`df -h | grep "$USAGE" | tr -s ' ' | cut -d' ' -f4`

FDISK=`df -h | grep "$USAGE" | tr -s ' ' | cut -d' ' -f6`

echo "diskinfo:"

#echo "$DISKINFO"

echo "$DISK"

echo

echo  -e "size:$SIZE; userd:\E[1;31m$USED\E[0m; avail:\E[1;32m$AVAIL\e[0m; use%：\E[1;35m$USAGE\e[0m "

echo

echo -e  "\e[1;36mdisk-partition: $DISK\e[0m"

echo "File-directory: $FDISK"