sorting numerically by first row

问题

I have a file with almost 900 lines in excel that I've saved as a tab deliminated .txt file. I'd like to sort the text file by the numbers given in the first column (they range between 0 and 2250). The other columns are both numbers and letters of varying length eg.

myfile.txt:

0251  abcd 1234,24 bcde
2240  efgh 2345,98 ikgpppm
0001  lkjsi 879,09 ikol

I've tried

sort -k1 -n myfile.txt > myfile_num.txt

but I just get an identical file with new name. I'd like to get:

myfile_num.txt

0001  lkjsi 879,09 ikol 
0251  abcd 1234,24 bcde
2240  efgh 2345,98 ikgpppm

What am I doing wrong? I'm guessing that it's quite simple, but I'd appreciate any help I can get! I only know a little bash scripting, so it'd be nice if the script is a very simple one-liner that I can understand :)

Thanks :)

回答1:

Use this to convert old Mac OS carriage return to newline:

tr '\r' '\n' < myfile.txt | sort

回答2:

As stated here you can have problems with this (and in the other pseudo-follow-up-duplicate question you asked, yes, you did)

tr '\r' '\n' < myfile.txt | sort -n

It works fine here on MSYS but on some platforms you may have to add:

export LC_CTYPE=C

or tr will consider the file as a text file, and probably will tag it as corrupt after having reached the max line limit.

Obviously I could not test it, but I'm confident it will solve the problem given what I read on the linked answer.

回答3:

A python approach (python 2 & 3 compatible), immune to all shell problems. Works great, and portable. I noticed that the input file has some '0x8C' chars (exotic dots), probably confusing tr command. That is handled properly below:

import csv,sys

# read the file as binary, as it is not really text
with open("Proteins.txt","rb") as f:
    data = bytearray(f.read())
    # replace 0x8c char by classical dots
    for i,c in enumerate(data):
        if c>0x7F: # non-ascii: replace by dot
            data[i] = ord(".")

    # convert to list of ASCII strings (split using the old MAC separator)
    lines = "".join(map(chr,data)).split("\r")

    # treat our lines as input for CSV reader
    cr = csv.reader(lines,delimiter='\t',quotechar='"')

    # read all the lines in a list    
    rows = list(cr)
    # perform the sort (tricky)
    # on first row, numerical, removing the leading 0 which is illegal
    # in python 3, and if not numerical, put it at the top

    rows = sorted(rows,key=lambda x : x[0].isdigit() and int(x[0].strip("0")))

# write back the file as a nice, legal, ASCII tsv file

if sys.version_info < (3,):
    f = open("Proteins_sorted_2.txt","wb")
else:
    f = open("Proteins_sorted_2.txt","w",newline='')

cw = csv.writer(f,delimiter='\t',quotechar='"')
cw.writerows(rows)
f.close()

来源：https://stackoverflow.com/questions/39058356/bash-sort-numerical-osx

标签

bash

macos

sorting

carriage-return

numerical