Bash 命令时间输出到 .txt

Question

Hello I have a bash script that I made intending to measure the time elapsed, CPU% and Memory usage of the script download_test.sh with the output being put into a .txt file with the desired output like :

Elapsed time: 1263.75s
Memory usage: 62916 KB
CPU usage: 0%

The script that executes this looks like:

#!/bin/bash
echo 'RESULTS' >> log.txt
{ /usr/bin/time -f 'Elapsed time: %es\nMemory usage: %M KB\nCPU usage: %P' bash download_test.sh  1 ; }  2>> log.txt

However the download terminal progress is also being directed to the .txt file ie

RESULTS

Downloading:  95%|#########5| 827M/870M [00:00<?, ?B/s]
Downloading:  95%|#########5| 828M/870M [00:00<00:11, 3.68MB/s]
...
Elapsed time: 14.67s
Memory usage: 62592 KB
CPU usage: 0%

I am new to using stderr and stdout so have I misunderstood them and how would I resolve this issue?

Answer 1

I don't think this is stderr . You can use below command to print required rows.

awk '/Elapsed/,/CPU/'

Try this

#!/bin/bash
echo 'RESULTS' >> log.txt
{ /usr/bin/time -f 'Elapsed time: %es\nMemory usage: %M KB\nCPU usage: %P' bash download_test.sh  1 ; } | awk '/Elapsed/,/CPU/' 2>> log.txt