如何在bash中打印以给定文件名作为stdin的文件内容？

Question

Is there a bash command like cat except that it takes the filename from stdin rather than the first argument? For example:

echo "/home/root/file.txt" | somecommand

would have the same output as cat /home/root/file.txt

Answer 1

Found the answer:

xargs cat

For example:

echo "/home/root/file.txt" | xargs cat

Answer 2

If the filename that you're expecting doesn't have a space:

#!/bin/bash    
read filename
cat $filename

The read builtin shell command reads tokens from stdin into environment variables.