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要實現的功能
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C語言程式設計
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Linux Shell指令碼程式設計
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程式/指令碼的引數傳遞
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int main(int argc, char** argv)
{
if (argv != 4) {
printf( “Usage: %s arg1 arg2 arg3”, argv[0] );
return 1;
}
printf(“arg1:%s\n”,argv[1]);
printf(“arg2:%s\n”,argv[2]);
printf(“arg3:%s\n”,argv[3]);
return 0;
}
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#!/bin/sh
if [ $# -lt 3 ]; then
echo "Usage: `basename $0` arg1 arg2 arg3" >&2
exit 1
fi
echo "arg1: $1"
echo "arg2: $2"
echo "arg3: $3"
exit 0
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int main(int argc, char** argv)
{
int i;
for (i=1; i<=argc;i++) {
printf(“arg:%s\n”,argv[i]);
}
return 0;
}
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#!/bin/sh
while [ $# -ne 0 ]
do
echo "arg: $1"
shift
done
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邏輯/數值運算
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if (d == 0)
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if [ "$D" -eq "0" ] ; then
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if (d != 0)
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if [ "$D" -ne "0" ] ; then
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if (d > 0)
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if [ "$D" -gt "0" ] ; then
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if (d < 0)
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if [ "$D" -lt "0" ] ; then
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if (d <= 0)
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if [ "$D" -le "0" ] ; then
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if (d >= 0)
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if [ "$D" -ge "0" ] ; then
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字串比較
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if (strcmp(str,”abc”)==0) {
}
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if [ "$STR" != "abc" ]; then
fi
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輸入和輸出
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scanf(“%d”,&D);
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read D
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printf( “%d”, D);
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echo –n $D
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printf( “%d”,D);
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echo $D
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printf( “Press any to continue...”);
char ch=getchar();
printf( “\nyou pressed: %c\n”, ch );
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#!/bin/sh
getchar()
{
SAVEDTTY=`stty -g`
stty cbreak
dd if=/dev/tty bs=1 count=1 2> /dev/null
stty -cbreak
stty $SAVEDTTY
}
echo -n "Press any key to continue..."
CH=`getchar`
echo ""
echo "you pressed: $CH"
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read D
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程式/指令碼的控制流程
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if (isOK) {
//1
} else if (isOK2) {
//2
} else {
//3
}
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if [ isOK ]; then
#1
elif [ isOK2 ]; then
#2
else
#3
fi
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switch (d)
{
case 1:
printf(“you select 1\n”);
break;
case 2:
case 3:
printf(“you select 2 or 3\n”);
break;
default:
printf(“error\n”);
break;
};
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case $D in
1) echo "you select 1"
;;
2|3) echo "you select 2 or 3"
;;
*) echo "error"
;;
esac
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for (int loop=1; loop<=5;loop++) {
printf( “%d”, loop);
}
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for loop in 1 2 3 4 5
do
echo $loop
done
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do {
sleep(5);
} while( !isRoot );
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IS_ROOT=`who | grep root`
until [ "$IS_ROOT" ]
do
sleep 5
done
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counter=0;
while( counter < 5 ) {
printf( “%d\n”, counter);
counter++;
}
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COUNTER=0
while [ $COUNTER -lt 5 ]
do
echo $COUNTER
COUNTER=`expr $COUNTER + 1`
done
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while (1) {
}
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while :
do
done
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break;
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break或break n，n表示跳出n級迴圈
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continue;
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continue
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函式與過程的定義
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void hello()
{
printf( “hello\n” );
}
…
//函式呼叫
hello();
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hello()
{
Echo “hello”
} 或者
function hello()
{
Echo “hello”
}
…
#函式呼叫
hello
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函式的引數和返回值
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int ret = doIt();
if (ret == 0) {
printf( “OK\n” );
}
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doIt
if [ “$?” –eq 0 ] ; then
echo “OK”
fi
或者
RET = doIt
if [ “$RET” –eq “0” ] ; then
echo “OK”
fi
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int sum(int a,int b)
{
return a+b;
}
int s = sum(1,2);
printf(“the sum is: %d\n”, s);
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sum()
{
echo -n "`expr $1 + $2`"
}
S=`sum 1 2`
echo "the sum is: $S"
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bool isOK() { return false; }
if (isOK) {
printf( “YES\n” );
} else {
printf( “NO\n” );
}
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isOK()
{
return 1;
}
if isOK ; then
echo "YES"
else
echo "NO"
fi
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