linux shell 脚本命令操作案例大全

#!/bin/bash
echo ======================== this is a bash demo========================
printf "%s is %d years old  \n" zhengjinwei 23

declare count=10
declare fruit=apple

declare strNormal="we have $count ${fruit}'s "
declare strSpecial="we have $count ${fruit} "

function printStr()
{
if [ $count -gt 1 ] ; then
echo "$strNormal"
else
echo "$strSpecial"
fi
}

printStr

echo $(uname)

#########################################
declare num=1000
function printNum()
{
local num=10
let num+=10
echo $num
}

echo "the global num is : $num "

echo -e  "call printNum Function :"
printNum

o "==================this is if else fi ....test demo====================="
if [ -f "test.sh" ] ; then
echo "named test.sh is a file.."
else
echo "named test.sh is not a file.."
fi

function checkVariableHaveNum()
{
if [ -n "$1" ] ; then
echo "this variable have value"
else
echo "this variable have not value"
fi
}

declare g_num=10
checkVariableHaveNum $g_num

function checkVariableEqual()
{
if [ "$1" -eq "$2" ] ; then
printf "%d == %d " $1 $2
elif [ "$1" -ne "$2" ] ; then
printf "%d != %d " $1 $2
elif [ "$1" -ge "$2" ] ; then
printf "%d >= %d " $1 $2
elif [  "$1" -gt "$2" ] ; then
printf "%d > %d" $1 $2
elif [ "$1" -lt "$2" ] ; then
printf "%d < %d" $1 $2
else
printf "%d <= %d" $1 $2
fi
}

checkVariableEqual 2 4
checkVariableEqual 4 2
checkVariableEqual 2 2

echo "-------------------------------------"
########this is string opt################################
#get string's length
declare strName="zhengjinwei"
declare strNameLength=${#strName}
printf "the length of %s is %d \n" $strName $strNameLength

function getChildString()
{
local StrResourse=$1
local nParamCount=$2
local nStartPos=$3
local nEndPos=$4

if [[ $nParamCount -lt 3 ]] ; then
echo "param less than 3 is err"
elif [[ $nParamCount -gt 4 ]] ; then
echo "param more than 4 is err"
else

if [[ $nParamCount -eq  3 ]] ; then
let nEndPos=${#StrResourse}
else
let nEndPos=$4
fi
fi

local strResult=${StrResourse:$nStartPos:$nEndPos}

printf "the child string in %s from position %d to %d is %s: \n\n\n" $StrResourse $nStartPos $nEndPos $strResult

}

getChildString "zhengjinwei" 4 2 6

getChildString "zhengjinwei" 3 2

###########################################################
<span style="font-size:24px;"># this is array test demo
declare array_int=(1 2 3 4 5 6 7)

printf "the int value in array_int which index is %d is %d\n\n" 0 ${array_int["0"]}

echo "=============for loop=============================="
declare array_int_len=${#array_int[*]}
for (( i=0 ;i<"$array_int_len";i++ ))
do
echo -e ${array_int[$i]}
done

echo ""
echo "============for iterator loop================================"

for value in ${array_int[@]}
do
echo -e $value
done

echo ""
echo "==========while loop=================================="

declare i=0
while (( $i<$array_int_len ))
do
echo -e ${array_int[$i]}
let i=i+1
done

########################################################</span>

function getNowtime()
{
local _date=$(date +%Y-%m-%d:%H-%M-%S:%A)
echo $_date
}

function getCostTime()
{
local _start=$(date +%S)
sleep 2
local _end=$(date +%S)
local _cost=$(( _end - _start ))
echo $_cost
}

function getDiffTimeBetweenInSeconds()
{
local _start=$(date +%s -d '2010-09-01 17:00:00')
local _end=$(date +%s -d '2011-09-01 18:40:40')
tep=$(($_end-$_start))
tep2=$(( 3600*24 ))
result=$(( $tep/$tep2 ))

extra=$[ $tep%$tep2 ]

declare _hours=0
declare _seconds=0
if [ $extra -ge 3600 ] ; then
_hours=$(( $extra/3600 ))
_seconds=$(( $extra%3600))
else
_hours=0
_seconds=$extra
fi

printf "%d days ---%d hours ----%d seconds \n\n" $result $_hours $_seconds
}
getNowtime
getCostTime
getDiffTimeBetweenInSeconds