python找不到os模块_“找不到命令”；使用python在os.system的参数中使用line

我不是女神ヾ 2023-01-09 12:47 165阅读 0赞

![Image 1][]

I am new to python and working on some xyz project where i am taking the day-1 dated report, fetching the data and redirecting it into another file on linux machine

here is my code.

\#!/usr/bin/python

import os

cur\_date = os.popen("date -d '-1 day' '+%Y%m%d'").read()

print (cur\_date)

it is printing below error.

20180731

\*\*gzip: /var/tmp/comp?/emse\_revres\_rdc.log.20180731.gz: No such file or directory

sh: line 1: 1: command not found\*\*

but when i am executing the same in shell it is running absolutely fine or if i manually give the date and run the above, it runs successfully.

Please provide your suggestions on the same.

解决方案

The \* has nothing to do with the problem; the string you're substituting with %s ends with a newline, and that newline is what breaks your code.

When you use os.popen('...').read(), you get the entire output of ... -- including the trailing newline, which shell command substitutions implicitly trim.

The best answer would be to rewrite your logic in Python, but the easy answer here is to use such a command substitution, which also avoids trying to pass values into a script via string substitution (which is a fast route to shell-injection security bugs):

shell\_script = r'''

cur\_date=$(date -d '-1 day' '+%Y%m%d')

zgrep "919535144580" /var/tmp/comp?/emse\_revres\_rdc.log."$cur\_date"\* \\

| grep -v "RI" \\

| cut -d "|" -f 9,10,23,24,26 \\

| sort \\

| uniq -c \\

| sort -nr \\

>> /var/tmp/Andy/test.txt

'''

os.system(shell\_script)

That said, if you're just going for the shortest change possible, put the following before your original code's os.system() call: