shell使用总结

一、字符串比较

1. 字符串相等比较用“=”或“==”，但是有区别！！

在用echo输出变量内容时，要用双引号。

=~可以用于判断字符串的包含关系，参考：滑动验证页面

#目前只支持在64位机器编译
if [ "${ARCH}" == "" ]; then
	ARCH=`getconf LONG_BIT`
	echo "Compile in ${ARCH} bit"
fi
if [ "${ARCH}" == "32" ]; then
	echo "do not support compile in 32 bit machine"
	exit -1
fi

# 默认为Tlinux1.2
if [ "${MACHINE_ARCH_D}" == "" ]; then
	MACHINE_ARCH_D=Tlinux1.2
	tlinux_desc=`cat /etc/tlinux-release`
	if [[ "${tlinux_desc}" =~ "1.2" ]]; then # 检测是否为Tlinux1.2
		MACHINE_ARCH_D=Tlinux1.2
		echo "MACHINE_ARCH_D:${MACHINE_ARCH_D}"
	elif [[ "${tlinux_desc}" =~ "2.2" ]]; then # 检测是否为Tlinux2.2
		MACHINE_ARCH_D=Tlinux2.2
		echo "MACHINE_ARCH_D:${MACHINE_ARCH_D}"
	else
		echo "do not support compile in ${tlinux_desc}"
		exit -1
	fi
fi