Linux CentOS服务器Red5媒体服务器安装报错求助

This error almost always stems from a syntax quirk or shell compatibility issue in your Red5 init script. Let’s work through the most common fixes step by step:

1. Fix the script’s shebang line #

The first line of your /etc/init.d/red5 script tells the system which shell to use to run it. If it’s set to #!/bin/sh but uses Bash-specific syntax (like [[ ]] conditionals), you’ll hit this error—CentOS’s default sh doesn’t support all Bash features.

How to fix:
Open the script with an editor:

vi /etc/init.d/red5

Change the first line from:

#!/bin/sh

To:

#!/bin/bash

Save and exit, then try running the script again.

2. Check the if statement syntax on line 22 #

Most often, this error comes from missing spaces around conditional brackets or incorrect formatting. Here are common mistakes and fixes:

• ❌ Wrong: if[[ -n "$RED5_HOME" ]] (no space after if or before [[)
• ❌ Wrong: if[ -f "$RED5_HOME/red5.sh" ] (no space after if)
• ✅ Correct: if [[ -n "$RED5_HOME" ]]
• ✅ Correct: if [ -f "$RED5_HOME/red5.sh" ]

Also make sure the if statement is followed by then (either on the same line with a semicolon or a new line):

# Valid format 1
if [ -d "$RED5_HOME" ]; then
    echo "Red5 directory exists"
fi

# Valid format 2
if [ -d "$RED5_HOME" ]
then
    echo "Red5 directory exists"
fi

To see the exact line and its context, run this command:

cat -n /etc/init.d/red5 | sed -n 18,26p

Adjust the line range if needed to get a clearer view of the problematic code.

3. Fix Windows-style line endings (CRLF) #

If you transferred the script from a Windows machine, it might have CRLF line endings instead of Unix-style LF. This can break shell script parsing entirely.

How to fix:
Install dos2unix to convert the line endings:

yum install -y dos2unix
dos2unix /etc/init.d/red5

Then try running the script again.

Quick test to confirm the issue #

If you want to bypass the shebang temporarily to rule out shell compatibility, run the script directly with Bash:

bash /etc/init.d/red5 start

If this works, the shebang line fix above will resolve the problem permanently.

内容的提问来源于stack exchange，提问作者Math02