LynPtl's Blog

Posted on Edited on In Word count in article: 17 Reading time ≈ 1 mins.

记录两个index之后交换他们的值

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#!/usr/bin/env python3

import sys
from collections import defaultdict

for line in sys.stdin:
    line = line.strip()
    if not line:
        continue
    
    line_list = line.split(" ")

    # key:value index:digit
    numbers=defaultdict(int)
    for index,word in enumerate(line_list):
        if word.isdigit():
            numbers[index] = word
    # 现在numbers里面就是index:digit的键值对了

    # 先判断找到了数字了吗
    if not numbers:
        print(line)
        continue

    # 然后交换最大的index和最小的index的值放回line
    max_index = max(numbers.keys())
    min_index = min(numbers.keys())

    line_list[max_index],line_list[min_index] = line_list[min_index],line_list[max_index]
    print(" ".join(line_list))

Posted on Edited on In Word count in article: 14 Reading time ≈ 1 mins.

截取后对着学号计数就可以了。

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#!/usr/bin/env python3

import sys
from collections import defaultdict

dic = defaultdict(int)

for line in sys.stdin:
    line = line.strip()
    if not line:
        continue
    field = line.split("|")
    id_and_name = field[1:3]

    dic[field[1]] += 1

ans = []
for key in dic:
    if dic[key] == 2:
        ans.append(key)

ans.sort()
for id in ans:
    print(id)

Posted on Edited on In Word count in article: 87 Reading time ≈ 1 mins.

uniq -c之后的处理需要注意。首先是如何搜索那个计数，匹配若干个空格开头然后2之后紧接空格的。
然后截取的时候需要先处理好前面的一大堆空格，不然直接cut -d “ “会出很多空格

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#!/bin/dash

sort -t "|" -k 2,2 | # 按照学号进行排序
cut -d "|" -f 2,3 | # 然后把学号和名字截出来
uniq -c | # 统计每个学号出现的次数
grep "^[[:space:]]*2 " | # 截取计数次数为2的行
cut -d '|' -f 1 | # 开始试图截取学号
tr -s ' ' | # 把uniq-c前面产生的空格压缩成一个
cut -d ' ' -f 3 # 最后把学号截出来

Posted on Edited on In Word count in article: 7 Reading time ≈ 1 mins.

用set去重。

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#!/usr/bin/env python3

import sys

guys = set()
for line in sys.stdin:
    line = line.strip()
    if not line:
        continue
    field = line.split("|")
    id_and_name = field[1:3]
    guys.add(tuple(id_and_name))

# 循环结束后set里面就是一大堆人的id和名字的元组

# 接下来提取名字并截取后面的部分放到列表中，排序后再输出
ans = []
for id_name in guys:
    name = id_name[1]
    last_name = name.split(", ")[-1]
    last_name = last_name.split(" ")[0]
    ans.append(last_name)

ans.sort()
for last_name in ans:
    print(last_name)

Posted on Edited on In Word count in article: 103 Reading time ≈ 1 mins.

要用学号和名字一起来去重。

cut和python的split方法不一样的地方在于cut -d选项只能放一个字符，所以用逗号分割之后，后半段的名字会以空格开头，因此最后用空格分割去找第一个名字的时候需要用第二个。

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#!/bin/dash

cut -d "|" -f 2,3 | sort -u | cut -d "," -f 2 | sort | cut -d " " -f 2

Posted on Edited on In Word count in article: 14 Reading time ≈ 1 mins.

需要注意空格。注意strip

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#!/usr/bin/env python3

import sys

for line in sys.stdin:
    field = line.strip().split('|')
    # 需要提前找好空格的长度
    raw_name_len = len(field[2].rstrip())
    space_len = len(field[2]) - raw_name_len

    name = field[2].strip().split(', ')
    name = name[::-1]
    newname = " ".join(name)
    field[2] = newname + " " * space_len
    print("|".join(field))

Posted on Edited on In Word count in article: 17 Reading time ≈ 1 mins.

gzip的命令 mkdir的-p选项

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#!/bin/dash

if [ -f "log.6" ];then
        mkdir -p archive

        today=$(date +'%Y_%m_%d')

        gzip -c log.6 > "archive/log.${today}.gz"

        rm -f log.6
fi

if [ -f "log.5" ];then mv log.5 log.6; fi
if [ -f "log.4" ];then mv log.4 log.5; fi
if [ -f "log.3" ];then mv log.3 log.4; fi
if [ -f "log.2" ];then mv log.2 log.3; fi
if [ -f "log.1" ];then mv log.1 log.2; fi
if [ -f "log" ];then mv log log1; fi
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