条件式の使用例

スクリプト／コマンド入力       

実行結果

Bシェル(bsh)スタイルの条件式

n=10
if [ $n = 10 ]; then
	echo "\$n is 10";
else
	echo "\$n is not 10";
fi

$n is 10

n=100
if [ $n = 10 ]; then
	echo "\$n is 10";
else
	echo "\$n is not 10";
fi

$n is not 10

n=100
if [ ! $n = 10 ]; then
	echo "\$n is not 10";
else
	echo "\$n is 10"; 
fi

$n is not 10

n=10
nn=100
if [ $n = 10 -a $nn = 100 ]; then
	echo "\$n is 10 and $nn is 100"
else
	echo "\$n is not 10 or $nn is not 100"
fi

$n is 10 and $nn is 100

n=10
if [ $n ]; then
	echo "\$n is not null"
else
	echo "\$n is null"
fi

$n is not null

Bashの条件式

if [ -f thefile ]; then
	echo "thefile exists!";
else
	echo "no thefile!";
fi

thefile exists!