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destinationFile = "./destination-file.csv" sourceFile = "./source-file" criteria = "Invalid user" matches = [] with open(sourceFile) as src: import re for line in src.read().split("\n"): if not criteria in line: continue login = re.sub(".*" + criteria + " (\w+).*", r"\1", line) matches.append(login) matches = sorted(list(set(matches))) count = len(matches) if count == 0: import sys print("No lines having '{}' in {}. Abort.".format(criteria, sourceFile)) exit(1) else: with open(destinationFile, "w+") as dst: dst.write("\n".join(matches)) print("{} login(s) written to {}.".format(count, destinationFile)) #M# file open/read/parse/write, regex/regular expression, regex group capture/replacement, list sort, list clean/remove duplicates, print list in file, system error
May 26 07:29:20 instance-1 sshd[20327]: Disconnected from 61.147.247.146 port 45177 [preauth] May 26 07:32:22 instance-1 sshd[20351]: Invalid user nagios from 159.65.144.233 port 49715 May 26 07:32:22 instance-1 sshd[20351]: input_userauth_request: invalid user nagios [preauth] May 26 07:32:23 instance-1 sshd[20351]: Received disconnect from 159.65.144.233 port 49715:11: Normal May 26 07:32:22 instance-1 sshd[20351]: Invalid user admin from 159.65.144.233 port 49715 May 26 07:32:22 instance-1 sshd[20351]: Invalid user nagios from 159.65.144.233 port 49715 May 26 07:32:22 instance-1 sshd[20351]: Invalid user nagios from 159.65.144.233 port 49715 May 26 07:32:22 instance-1 sshd[20351]: Invalid user admin from 159.65.144.233 port 49715 May 26 07:32:22 instance-1 sshd[20351]: Invalid user ellen from 159.65.144.233 port 49715
admin ellen nagios

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