什么“＃$”在bash中意味着什么？

Question

Say for example a script begins like this

#!/bin/bash
#$ -S /bin/bash
#$ -l hostname=qn*

and then later down the page the actual script comes into play. My question is what does the "#$" symbol mean or do?

Answer 1

Lines beginning with # are comments. The first line may begin with #! , but it's still a comment to bash and is merely used to indicate the interpreter to use for the file. All other lines beginning with # are absolutely unimportant to bash , whether the next character is $ or anything else.

Answer 2

Are you by any means running on a batch cluster ? Like Sun Grid Engine? There might be special meanings in scripts intended to run as a batch job.

https://www.wiki.ed.ac.uk/display/EaStCHEMresearchwik/How+to+write+a+SGE+job+submission+script

Update:

above link blocks when used from stackoverflow.com (works from google.com)

alternatives:

• http://www.cbi.utsa.edu/sge_tutorial
• http://web.njit.edu/all_topics/HPC/basement/sge/SGE.html

Answer 3

They seem to be parameters for the Oracle (ex-Sun) Grid Engine, look at this SO question or this one .

They are heavily using these kind of comments.

Answer 4

这些行对于像sbatch这样的队列系统很重要。