Bash join command outputs only one line

Question

On an AIX system this command:

    join installed_versions.csv apps_status.csv

With the following input files:

1. installed_versions.csv

    app installed_version appA 3.5 appB 3.5 appC 3.5 appD 4.3 appE 5.4 

2. apps_status.csv

    app status appA Running appB Running appC Running appD Running appF Check 

Gives me only one line of output:

    app installed_version status

And I expect to obtain the following output:

app installed_version status
appA 3.5 Running
appB 3.5 Running
appC 3.5 Running
appD 4.3 Running

Answer 1

我在AIX机器上获得了准确的期望输出，