53 lines
894 B
Bash
53 lines
894 B
Bash
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#!/usr/bin/env bash
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x="abc"
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if [[ -n $1 ]]; then
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x=$1
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fi
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y="xyz"
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if [[ -n $2 ]]; then
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y=$2
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fi
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echo "x=${x}, y=${y}"
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if [[ ${x} = ${y} ]]; then
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echo "${x} = ${y} : x 等于 y"
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else
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echo "${x} = ${y}: x 不等于 y"
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fi
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if [[ ${x} != ${y} ]]; then
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echo "${x} != ${y} : x 不等于 y"
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else
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echo "${x} != ${y}: x 等于 y"
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fi
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if [[ -z ${x} ]]; then
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echo "-z ${x} : 字符串长度为 0"
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else
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echo "-z ${x} : 字符串长度不为 0"
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fi
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if [[ -n "${x}" ]]; then
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echo "-n ${x} : 字符串长度不为 0"
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else
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echo "-n ${x} : 字符串长度为 0"
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fi
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if [[ ${x} ]]; then
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echo "${x} : 字符串不为空"
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else
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echo "${x} : 字符串为空"
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fi
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# Execute: ./operator-demo5.sh
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# Output:
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# x=abc, y=xyz
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# abc = xyz: x 不等于 y
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# abc != xyz : x 不等于 y
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# -z abc : 字符串长度不为 0
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# -n abc : 字符串长度不为 0
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# abc : 字符串不为空
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