Anything where the answer is dos2unix. The symptoms are varied and the clue quotient of the OPs is mostly, shall we say, chequered. In the end, by the time it's solved, it's obviously off-topic for SO, but you see some good programming and debugging coaching in the speculations leading up to that.
The examples I am finding are less spectacular than the best I've seen. These all contain literally dos2unix in the answer, but there will be hundreds more with different wording.
- running script file in ubunturunning script file in ubuntu
- Looping in Bash: syntax error: unexpected end of fileLooping in Bash: syntax error: unexpected end of file
- Running Executable from Shell ScriptRunning Executable from Shell Script
- Script showing bad interpreter and will not runScript showing bad interpreter and will not run
- Bash script prints "Command Not Found" on empty linesBash script prints "Command Not Found" on empty lines
- ORA-06550 and PLS-00103ORA-06550 and PLS-00103
- Why are ^M and ^[ being appended to my files?Why are ^M and ^[ being appended to my files?
- Issue with making python program executableIssue with making python program executable
