CODEWITHSUNDEEP
stringbashmacosconcatenation
Etienne Martin
Etienne Martin

Reputation: 11569

String concatenation in bash 3.2.57 (macOS)

My goal is to concatenate two strings.

Here's a copy-paste of my bash script:

str1="Hello"
str2="World"
str3=$str1$str2
echo $str3

The expected output is HelloWorld but I'm getting World instead.

It works fine when I run it in the terminal.

Here's the output when I run cat -v on my script:

str1="Hello"^M
str2="World"^M
str3=$str1$str2^M
echo $str3^M

Am I missing something?

Upvotes: 2

Views: 1854

Answers (1)

choroba
choroba

Reputation: 241848

That's probably because you have a carriage return (\r) at the end of $str1. I'm getting the same output with the following:

#!/bin/bash
str1="Hello"$'\r'
str2="World"
str3=$str1$str2
echo $str3

It often happens when you create the script on a MSWin machine.

It prints Hello, but then \r moves the cursor back to the beginning of the line, and overwrites the Hello with World.

You can verify it by running it through a hex dump or cat -v.

Upvotes: 6

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