delete specific lines in txt file python

Question

so I have text file file.txt e.g

daemon

nserver 1111
nserver 11111
nscache 65536

timeouts 1 5 30 60 180 1800 15 60
log /var/log/3proxy/log D
logformat "- +_L%t.%. %N.%p %E %U %C:%c %R:%r %O %I %h %T"
logformat "L%t.%. %N.%p %E %U %C:%c %R:%r %Q:%q %O %I %h %T %n "

rotate 360
#external 0.0.0.0
#internal 0.0.0.0

auth strong
########################################################################## Ttest-for-dev ##########################################################################
users ttest-for-dev:CL:d4ec7bf6
allow login,ttest-for-dev
proxy -n -a -p8989 -i194.150.75.50 -e194.150.75.50
socks -n -a -p43434 -i194.150.75.50 -e194.150.75.50
flush
########################################################################## specuser ##########################################################################
users specuser:CL:d4ec7bf6
allow login,specuser
proxy -n -a -p8989 -i194.150.75.50 -e194.150.75.50
socks -n -a -p43434 -i194.150.75.50 -e194.150.75.50
flush

deny *

maxconn 254

setgid 65534
setuid 65534

now how can i remove the lines so that the following is left

So the output file will be

daemon

nserver 1111
nserver 11111
nscache 65536

timeouts 1 5 30 60 180 1800 15 60
log /var/log/3proxy/log D
logformat "- +_L%t.%. %N.%p %E %U %C:%c %R:%r %O %I %h %T"
logformat "L%t.%. %N.%p %E %U %C:%c %R:%r %Q:%q %O %I %h %T %n "

rotate 360
#external 0.0.0.0
#internal 0.0.0.0

auth strong
########################################################################## Ttest-for-dev ##########################################################################
users ttest-for-dev:CL:d4ec7bf6
allow login,ttest-for-dev
proxy -n -a -p8989 -i194.150.75.50 -e194.150.75.50
socks -n -a -p43434 -i194.150.75.50 -e194.150.75.50
flush

deny *

maxconn 254

setgid 65534
setuid 65534

Thank you

I have a script that adds lines, but I have no idea how to remake it to fit the conditions in the question

import sys

import fileinput


nameuser = "user1"
passuser = "pass1"

file_name = '/usr/local/etc/3proxy.cfg'
for line in fileinput.FileInput(file_name,inplace=1):
    if 'auth strong' in line:
        line = line.strip()
        line = line.replace(line, line+'n########################################################################## '+ nameuser +' ##########################################################################'+'nusers '+ nameuser +':CL:'+ psuser +'nallow login,'+ nameuser +'nflush')
    print (line, end='')

Asked By: Андрей

||

Source

Answer 1

Read the file line by line. When you get to the ###... specuser line, start a loop that keeps reading until the flush line. Otherwise, print the line.

import re

with fileinput.FileInput(file_name,inplace=1) as infile:
    for line in infile:
        if re.match('#+ specuser #+$', line):
            for nextline in infile:
                if nextline.strip() == 'flush':
                    break
            continue
        print(line, end='')

Answered By: Barmar

delete specific lines in txt file python

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