To ignore the first two characters (the list numberings) in the file list. Add unique words from a text file to a list in python. Getting unique values for a file in python. This feature helps when the data you are working with is in the form of a list as follows: 1. For example: I am not a robot I am a human Should return: I am not a robot human Here is what Ive done so far: def uniquefile(Stack Overflow. Share Improve this answer Follow answered at 14:29 FelixJN 12.6k 2 27 48 3 Note that sort -u can return incorrect result in locales which have collating characters sort the same. The -s flag allows you to specify the number of characters to skip while matching duplicate lines. 2 Answers Sorted by: 6 sort -k1,1 -u file Sort file by first column and take first unique entry only. Like skipping fields, you can skip characters as well. I would grep on 'name1 ' (with a space after name1) to avoid that. Then, it displayed the first occurrence of each match as the output. This question already has answers here : How to delete duplicate lines in a file without sorting it in Unix (9 answers) Closed 4 years ago. 1 If you have name1 in another field or a user named name1foo, the solution could give results you do not want. The aforementioned command skipped the first field (the IP addresses and OS names) and matched the second word (TCP and FS). Please note, I dont want to introduce a inner loop here, just for the grep part. Below code is working, bust just wanted to know this is the right approach. The actual need is to: 'display all the lines from the original file removing all the duplicates (not just the consecutive ones), while maintaining the original order of statements in the file. To skip the first field: uniq -f 1 fields.txt Basically I wanted to emulate the piped grep operation as we do in shell script, (grep pattern1 grep pattern2) in my Perl code to make the result unique. 'without having to sort the data' only appears in the title. How do you output a Linux column with value print (awk, command, Unix). The -f stands for Field.Ĭonsider the following text file fields.txt. ![]() ![]() If you want to skip a certain number of fields while matching the strings, you can use the -f flag with the command. Skip Fields While Checking for Duplicates The system will display output as follows. To only print duplicate lines from the text file, use the -D flag. By default, the uniq command is case-sensitive. You can see that the line This is a text file occurs two times in the file. If you know you're dealing with a trivial document and the format doesn't change or if it's a one time job where you can quickly validate the results, you can go for grep as explained by others.The system displays the count of each line that exists in the text file. You could technically write the regular expression to get what you need but it's a lot easier with XPath. Įxtracting the title of the article represented by this document with grep would fail if you used any of the other answers posted here. If you want to eliminate all duplicate lines from a text file you can do something like this: cat file.txt sort uniq. Desired output: A.txt: A f1 A f3 B.txt: B f2 B f4 B f5 Tried it with uniq but it’s not working. You can pass stdin to sort, as well: grep -rnw '/path/to/files' sort -u - > /tmp/out.txt. XPath makes it easy to tell the difference between similarly named tags that appear in different contexts in a document. I want to sort it based on first column values and keep it in separate files. If the document is complex or if you're using this in a script that will survive months or years and not just a one-off job, you may end up feeling sorry for the results. For example, here were collecting logs from. ![]() For a very simple scenario, you can get it working. Additionally, the output of tail -f can be piped into grep to filter the output from a log file. The problem with grep here is that it's a generic tool for text processing and it's not aware of any XML structure. There are many command line tools for XPath and they're usually bundled with the OS.Īnswers to this question on Stack Overflow list a number of such tools. The -x option is for matching entire lines, while -f is for specifying the pattern file. Let’s find lines unique to file1 with grep: grep -Fxvf file2 file1 D We use the -F option to interpret patterns as fixed strings. I can't see why you'd want to use grep for this, while it can be solved with a trivial XPath expression: //title/text() We can use the grep command with the -v option to search for lines that are not present in one of the files.
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