# Exit Code	Meaning
0	Success: The command or script executed without errors.
1	General error: A generic error occurred during execution.
2	Misuse of shell builtins: Incorrect usage of a shell built-in command.
126	Command invoked cannot execute: Permission denied or command not executable.
127	Command not found: The command is not recognized or available 

# Custom codes
5	Input/output error: Failure to read or write data.
6	No such device or address: The specified device or address is unavailable.
64	Command-line usage error: General syntax error in the command-line arguments.
65	Data format error: The input data format is incorrect or unexpected.
66	Cannot open input: A specified file or input cannot be accessed.
67	Addressee unknown: Invalid or unknown destination address.
68	Host name unknown: Unable to resolve the specified host.
69	Service unavailable: A service required to complete the task is unavailable.
70	Internal software error: An unhandled error occurred in the software or script logic.
71	System error: Generic system-related error, such as insufficient resources.
72	Critical OS file missing: Required system files are not accessible or missing.
73	Cannot create: Failure to create a file or directory.
74	I/O error: Generic input/output failure.
75	Temporary failure: A temporary condition caused the failure (e.g., network issue).
76	Remote protocol error: An error occurred in a remote communication protocol.
77	Permission denied: The user or process lacks sufficient privileges.
78	Configuration error: An issue occurred in configuration files or settings.n the environment’s PATH.
128	Invalid exit argument: An invalid argument was provided to the exit command.
130	Script terminated by Ctrl+C (SIGINT).
137	Script terminated by SIGKILL (e.g., kill -9 or out-of-memory killer).
139	Segmentation fault: Indicates a segmentation fault occurred in the program.
143	Script terminated by SIGTERM (e.g., kill command without -9).
255	Exit status out of range: Typically, this happens when a script or command exits with a number > 255.