How can I give a script that reads input from a file input from stdin?-CodePudding

I am working on a project that uses a script (blastn from NCBI's BLAST package) that, as far as I can tell, can only read input from a file. I'd like to be able to pass it a string in stdin and have it treat that as if it's the contents of a query file. I could do that by writing the string to a file then giving this script the name of a file but is there a different way to do it that I could try?

CodePudding user response：

2 things come to mind:

many tools (but not all) treat the filename - as "read from stdin"
```
seq 20 | paste - -
```
use a Process Substitution, that looks to the program like a filename
```
rev <( echo "hello world" )
```