bash - Bash script runs faster from file than in command line

Question

If I put this bash script

for ((i=0; i < 111; i++)); do
    echo $i
done

in a file and run it, it runs faster than if I typed it directly in the command line. Why is this? (I'm running Ubuntu.)

Answer 1

我执行了这两个示例并使用time.

在文件中运行：

real    0m0.038s
user    0m0.000s
sys     0m0.004s

从命令行运行：

real    0m0.002s
user    0m0.004s
sys     0m0.000s

我能想到的唯一会导致这种差异的事情是，当您执行脚本/文件时，您还需要考虑磁盘访问以及您正在运行的任何文件系统。