新建文件后执行程序 运行结果为:第一次的内容被覆写 [r+ read] abcdefg [r read] abcdefg ----------------- [r+ read] 123defg...运行结果: [w+ read] abcdefg [r read] abcdefg ----------------- [w+ read] 123 [r read] 123 a...运行结果:第二次写的内容追加在第一次写的内容中 [r read] abcdefg ----------------- [r read] abcdefg123 a+ 以追加方式打开可读写的文件...[a+ read] abcdefg [r read] abcdefg ----------------- [a+ read] abcdefg123 [r read] abcdefg123...] abcdefg [r read] abcdefg ----------------- [a+ read] abcdefg123 [r read] abcdefg123
下面我们简单说说grep这个命令的一些常用参数和用法: 1、没有参数 [root dba_mysql]# cat yeyz.sh abcdefg abcd aaaaaaa ddddddd...[root dba_mysql]# cat yeyz.sh|grep abcd abcdefg abcd 没有参数的时候,grep命令将yeyz.sh中包含abcd的行给过滤出来...abcd aaaaaaa ddddddd [root dba_mysql]# cat yeyz.sh|grep abcd abcdefg abcd 包含...abcd的行后面一行 [root dba_mysql]# cat yeyz.sh|grep -A1 abcd abcdefg abcd aaaaaaa 包含abcd的行后面两行...dba_mysql]# cat yeyz.sh | grep 'abc' abcdefg abcd 6.
截取 substring( ) 用法: 1. substring(str,pos) 例子: SELECT substring('abcdefg',1); -> 'abcdefg' SELECT substring...('abcdefg',2); -> 'bcdefg' SELECT substring('abcdefg',-2); -> 'fg' str 是被操作的字符串,pos 表示是从哪个位置开始。...2. substring(str from pos) 例子: SELECT substring('abcdefg' from 1); -> 'abcdefg' SELECT substring('abcdefg...3. substring(str,pos,len) 例子: SELECT substring('abcdefg' , 1 , 2); -> 'ab' SELECT substring('abcdefg...('abcdefg' from 2 for 2); -> 'bc' SELECT substring('abcdefg' from -2 for 1); -> 'f' 与 3 的用法相同,但是 第一个逗号
long='123456789abcdefg123456789abcdefg123456789' echo ${#long} # 41,长度 echo ${long:3} # 456789abcdefg123456789abcdefg123456789...,从第三位开始截取 echo ${long:3:6} # 456789,从第三位开始截取长度为 6 的子串 echo ${long#*a} # bcdefg123456789abcdefg123456789...echo ${long%%a*} # 123456789,从尾开始删除最长匹配 echo ${long/abc/ABC} # 123456789ABCdefg123456789abcdefg123456789...,替换首次出现的子字符串 echo ${long//abc/ABC} # 123456789ABCdefg123456789ABCdefg123456789,全局替换 echo ${long/#123/...ABC} # ABC456789abcdefg123456789abcdefg123456789,字符串的前面数位和 123 匹配,替换之 echo ${long/%789/ABC} # 123456789abcdefg123456789abcdefg123456ABC
@Test public void test07() { String str01 = "ABCDefg"; String str02 = "abcdefg"; System.out.println...+ str01.toLowerCase()); System.out.println("转成大写:" + str02.toUpperCase()); String str03 = "abcdefg..."; String str04 = "ABCDEFG"; System.out.println("toLowerCase() 返回原字符串:" + str03.toLowerCase()...); System.out.println("toUpperCase() 返回原字符串:" + str04.toUpperCase()); String str05 = "Abcdefg1234
"; 15: var str2 = "ABCDEFG"; 16: var str3 = "1234678"; 17: var str4 = "...从下面的截图中我们可以清晰地看到:除了一个值为”byteIndex”的字符串之外,另两个的值分别为”ABCDEFG”和“12345678”,它们就是我们在静态方法BuildString创建的。...1: static void BuildString() 2: { 3: var str1 = "ABCDEFG"; 4: var str2 = "1234678";...为此,我们对BuildString方法进行如下的修改:将"ABCDEFG" + str2运算的结构传入string.Intern静态方法中。...实例列表中,多出了一个“ABCDEFG1234678”。
比如: from itertools import islice islice('ABCDEFG', 2) 返回一个迭代器: 遍历迭代器会返回...:A B islice('ABCDEFG', 2, 4) 遍历会返回:C D islice('ABCDEFG', 2, None) 遍历会返回: C D E F G islice('ABCDEFG',
Example Input & Output Input: ABCDEFG ABCDEFG Output: ACEGIKM ABCDEFG solution code from string import...ciphertext) # 解密过程 key1 = key print('解密后的内容为:', encrypt(ciphertext, deKey(key1))) output 请用大写字母输入加密的内容:ABCDEFG...请用大写字母输入密钥:ABCDEFG 密文为: ACEGIKM 解密后的内容为: ABCDEFG 受于文本原因,本文相关算法实现工程无法展示出来,现已将资源上传,可自行点击下方链接下载。
--->0",0] Server receive the msgpack message : ["ABCDEFG --->1",1] Server receive the msgpack message...: ["ABCDEFG --->2",2] ······省去代码······ Server receive the msgpack message : ["ABCDEFG --->98",98] Server...receive the msgpack message : ["ABCDEFG --->99",99] 客户端输出 Client receive the msgpack message : ["ABCDEFG...: ["ABCDEFG --->2",2] ······省去代码······ Client receive the msgpack message : ["ABCDEFG --->98",98] Client...receive the msgpack message : ["ABCDEFG --->99",99]
生成测试用的文件 public static void writeLargeFile() throws IOException { String content = "12345678-abcdefg...writeChannel.write(buffer); } writeChannel.close(); } 运行完后,测试文件中的内容如下: 12345678-abcdefg...-菩提树下的杨过 12345678-abcdefg-菩提树下的杨过 12345678-abcdefg-菩提树下的杨过 12345678-abcdefg-菩提树下的杨过 12345678-abcdefg-...菩提树下的杨过 12345678-abcdefg-菩提树下的杨过 12345678-abcdefg-菩提树下的杨过 12345678-abcdefg-菩提树下的杨过 12345678-abcdefg-菩提树下的杨过...12345678-abcdefg-菩提树下的杨过 3.1 常规方法示例 public static void modify1() throws IOException { String
/usr/bin/python # -*- coding: UTF-8 -*- # 正序取值 mystr = 'abcdefg'; # 0:表示开始下标,2:表示结束下标但不包含结束下标 print.../usr/bin/python # -*- coding: UTF-8 -*- # 正序取值 mystr = 'abcdefg'; # 输出全部字符串 print mystr; 代码截图2:.../usr/bin/python # -*- coding: UTF-8 -*- # 正序取值 mystr = 'abcdefg'; # 输出字符串中的第一个字符 print mystr[0];.../usr/bin/python # -*- coding: UTF-8 -*- # 正序取值 mystr = 'abcdefg'; # 输出从第3个字符开始的字符串 print mystr[3.../usr/bin/python # -*- coding: UTF-8 -*- # 正序取值 mystr = 'abcdefg'; # 输出从第3个字符开始的字符串 print mystr *
*/ select 'abcdefg' select STUFF('abcdefg',1,0,'1234') --结果为'1234abcdefg' select STUFF('abcdefg',1,1,...'1234') --结果为'1234bcdefg' select STUFF('abcdefg',2,1,'1234') --结果为'a1234cdefg' select STUFF('abcdefg'
它有一些常用的参数,先看两个: -b:以字节为单位进行切割 -c:以字符为单位进行切割 先看看-b和-c的区别,如下: [root@tk-dba-mysql ~]# cat test.txt abcdefg...\abc abcdefg\abc hijklmn\xyz [root@tk-dba-mysql ~]# cat test.txt|cut -b 2 b b i 我们定义一个文件,里面写上上述内容...如果我们在里面再写入一行中文,我们可以看到如下结果: [root@tk-dba-mysql ~]# cat test.txt abcdefg\abc abcdefg\abc hijklmn\xyz 我是中国人...-3 abcdefg\abc abcdefg\abc hijklmn\xyz 我是中国人 #重复写,不重复执行 [root@tk-dba-mysql ~]# cat test.txt|cut -c -...再来看例子: [root@tk-dba-mysql10-202 ~]# cat test.txt abcdefg\abc abcdefg\abc hijklmn\xyz 我是中国人 [root@tk-dba-mysql10
.length //8 拼接 +号 append let str1 = "abc" + "cde" var str = "abc" str.append("cde") 遍历 let str = "abcdefg..." for char in str { print(char) } --------------------- let str = "abcdefg" for (index, value) in...str.enumerated() { print("\(index) --- \(value)") } 大写或小写 let str = "abcdefg" print(str.lowercased...()) //全部小写 print(str.uppercased()) //全部大写 含有字符串 let str = "abcdefg" print(str.contains("cd")) //true...", "aaaa", "bbbb", "ccc"] print(des2) //["abcdefg", "aaaa", "bbbb", "ccc"] 替换 let str = "abcdefg$$aaaa
# coding:utf-8 user_info = { 'id':1, 'username':'dewei', 'password':'abcdefg', 'created_time.../pythondict/bin/python /Users/llq/PycharmProjects/pythonlearn/pythondict/dict_get.py [1, 'dewei', 'abcdefg...', '2020-01-01 11:11:11'] [1, 'dewei', 'abcdefg', '2020-01-01 11:11:11', None] 进程已结束,退出代码为 0 例3:用get...', '2020-01-01 11:11:11'] [1, 'dewei', 'abcdefg', '2020-01-01 11:11:11', '1986-01-01'] 进程已结束,退出代码为 0...', '2020-01-01 11:11:11'] [1, 'dewei', 'abcdefg', '2020-01-01 11:11:11', '1986-01-01'] 进程已结束,退出代码为 0
例如abcdefg和fghik拼接得到abcdefghik,1234和23456拼接得到123456,而1234和678无法拼接。...m, 0, -1): # 比较s1的最后i个字符是否与s2的前i个字符一样 if s1[-i:]==s2[:i]: return s1+s2[i:] print(checkAndMerge('abcdefg...', 'fghik')) print(checkAndMerge('1234', '23456')) print(checkAndMerge('abcdefg', 'abcdefghijkl')) print...(checkAndMerge('abcdefg', 'bcdefghijkl')) print(checkAndMerge('abcdef', 'abcdefghijkl')) 运行结果: abcdefghik
比如输入字符串"abcdefg"和数字2,该函数将返回左旋转2位得到的结果"cdefgab"。...以"abcdefg"为例,我们可以把它分为两部分。由于想把它的前两个字符移到后面,我们就把前两个字符分到第一部分,把后面的所有字符都分到第二部分。我们先分别翻转这两部分,于是就得到"bagfedc"。...TestCategory("LeftRotate")] [TestMethod] public void RotateTest1() { string input = "abcdefg...; string actual = ReverseWordsHelper.LeftRotateString(input, 0); string expected = "abcdefg...; string actual = ReverseWordsHelper.LeftRotateString(input, 7); string expected = "abcdefg
以下是一个 Amazon S3 对象存储的地址范例: s3://ABCDEFG:HIJKLMN@myjfs.s3.us-west-1.amazonaws.com 特别地,SRC 和 DST 如果以 /...文件系统: # 挂载 JuiceFS sudo juicefs mount -d redis://10.10.0.8:6379/1 /mnt/jfs # 执行同步 juicefs sync s3://ABCDEFG...例如,将对象存储 A 同步到对象存储 B,采用多主机并行同步: juicefs sync --worker bob@192.168.1.20,tom@192.168.8.10 s3://ABCDEFG:...HIJKLMN@aaa.s3.us-west-1.amazonaws.com oss://ABCDEFG:HIJKLMN@bbb.oss-cn-hangzhou.aliyuncs.com 当前主机与两个...oss://ABCDEFG:HIJKLMN@bbb.oss-cn-hangzhou.aliyuncs.com 同步以后,在对象存储 B 中看到的与 JuiceFS 使用的对象存储中的内容和结构完全一样
"abcdefg" StringUtils.truncate("abcdefg", 8) = "abcdefg" StringUtils.truncate("abcdefg", -1) = throws...StringUtils.abbreviate("abcdefg", 7) = "abcdefg" StringUtils.abbreviate("abcdefg", 8) = "abcdefg" StringUtils.abbreviate...("abcdefg", 4) = "a..."...StringUtils.abbreviate("abcdefg", ".", 7) = "abcdefg" StringUtils.abbreviate("abcdefg", "....", 8) = "abcdefg" StringUtils.abbreviate("abcdefg", "..", 4) = "ab.."
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