Software⏱️ 3 min read📅 2026-06-19

How to Fix: "Undefined variable" error in shell script on Sun Grid Engine

Sun Grid Engine shell script error fix

Quick Answer: The issue is caused by the incorrect use of backticks. Replace `#` with `` to correctly set the current working directory.

The 'Undefined variable' error in shell scripts is a common issue that affects Sun Grid Engine submissions. This error occurs when a variable is used without being previously defined or assigned a value. In this case, the 'currentdir' variable is used to print the current working directory, but it has not been defined.

This error can be frustrating for users who are not familiar with shell scripting and Sun Grid Engine. However, understanding the root cause of the issue and applying the correct fix methods can resolve the problem quickly.

⚠️ Common Causes

  • The primary reason for this error is that the '$(PWD)' variable, which represents the current working directory, is not used correctly. The '$(PWD)' variable needs to be enclosed in double quotes when used in a script.
  • Another possible reason for this error is that the '/bin/pwd' command is not available on the system where the script is being executed.

✅ Best Solutions to Fix It

Using $(PWD) correctly

  1. Step 1: To fix this issue, replace the line '$currentdir=`/bin/pwd`' with '$currentdir=$(pwd)' in the shell script. The double quotes around '$(PWD)' are not necessary and can cause issues.
  2. Step 2: This change will ensure that the current working directory is printed correctly when the script is executed.

Checking system availability

  1. Step 1: To verify if '/bin/pwd' is available on the system, check the 'which' command output. If '/bin/pwd' is not found, you may need to install it or use an alternative method to get the current working directory.
  2. Step 2: If '/bin/pwd' is available, but still causes issues, you can try using a different command to get the current working directory, such as '$(PWD)' or '$(CWD)'

✨ Wrapping Up

By applying these fix methods, users should be able to resolve the 'Undefined variable' error in their Sun Grid Engine submissions. Remember to always check your script for any syntax errors and verify that the system is available before running the job.

Did this fix your problem?

If not, try searching for specific error codes.

🔍 Search Error Database

❓ Frequently Asked Questions