What does linux eq mean?

linux eq means "equal to". It is a comparison operator in Linux, used to determine whether the numerical values ​​corresponding to strings are equal; the use of this operator is such as "if [ $num1 - eq $num2 ] then echo "$num1 and $num2xiangdeng" else echo "$num1 and $num2buxiangdeng"".

#The operating environment of this tutorial: linux5.9.8 system, Dell G3 computer.

linux What does eq mean?

linux eq (equal) is a comparison operator.

The difference between "==" and "-eq" in the linux shell (bash) test expression

First of all, we must understand a concept: all variables in bash are strings. When performing numerical calculations on variables, it is nothing more than temporarily converting a string into a number, then calculating, and then converting the resulting number into a string after calculation.

Let’s talk about the difference between "==" and "-eq"

"==" is to determine whether the strings are equal.

"-eq" is to determine whether the numerical values ​​corresponding to the strings are equal.

for example.

Create eq.sh script

>vi eq.sh

The content is as follows

#!/bin/bash
num1=123 #num1是长度为3的字符串
num2=0123 #num2是长度为4的字符串

echo "======================================"

echo -n "用==比较时："
if [ $num1 == $num2 ]
then
echo "$num1和$num2相等"
else
echo "$num1和$num2不相等"
fi

echo "======================================"

echo -n "用-eq比较时："
if [ $num1 -eq $num2 ]
then
echo "$num1和$num2相等"
else
echo "$num1和$num2不相等"
fi

Run the test

>bash eq.sh

The results are clear at a glance

======================================
用==比较时：123和0123不相等
======================================
用-eq比较时：123和0123相等

Conclusion:

== Compare strings directly, -eq compares the numeric value corresponding to the string.

The difference between !=, >, <, >=, <= and -ne, -gt, -lt, -ge, -le and so on

Related recommendations : "Linux Video Tutorial"

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