“command not found” using line in argument to os.system using python

Question

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

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Answer 1

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:

cur_date = cur_date.rstrip('\n')