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Linux自学第20天

  • 2026-06-29 18:57:00
Linux自学第20天

今天来学习一个输出命令 printf。

一、基本语法

printf  format-string  [arguments...]
  • format-string:包含普通字符和格式说明符的字符串

  • arguments...:与格式说明符对应的变量或值

常用的格式说明符包括:

  • %s:字符串

  • %d:十进制整数

  • %f:浮点数

  • %c:字符

  • %x:十六进制数

  • %o:八进制数

  • %b:二进制数

  • %e:科学计数法表示的浮点数

二、工作流程

1.解析格式字符串,遇到普通字符直接输出

2.遇到格式说明符(以%开头)时:

  • 读取下一个参数

  • 按照说明符指定的格式处理该参数

  • 将结果插入到输出中

3.处理完所有格式说明符后,输出最终结果

三、实践示例

1. 基本使用

# 简单字符串输出printf "Hello, World!\n"# 带变量的输出name="Alice"printf "Hello, %s\n" "$name"

执行与输出:

bash script.shHello, World!Hello, Alice

2. 常用格式说明符

# 整数printf "Decimal: %d\nHex: %x\nOctal: %o\n" 255 255 255# 浮点数printf "Float: %f\nScientific: %e\n" 3.14159 3.14159# 字符串printf "Name: %s\n" "Bob"# 字符printf "First letter: %c\n" "A"

执行结果:

Decimal255Hex: ffOctal377Float3.141590Scientific3.141590e+00Name: BobFirst letter: A

3. 格式化控制

# 字段宽度和对齐printf "|%10s|\n|%-10s|\n" "right" "left"# 数字前导零printf "Year: %04d\n" 23# 浮点数精度printf "Pi: %.2f\n" 3.14159

执行结果:

|     right||left      |Year0023Pi: 3.14

4. 多参数处理

printf "%-10s %5d %8.2f\n" "Apple" 5 2.5 "Orange" 3 1.75

执行结果:

Apple          5     2.50Orange         3     1.75

扩展应用

1. 创建表格输出

# 表头printf "%-15s %10s%10s%10s\n" "Item" "Quantity" "Price" "Total"# 分隔线printf "%-15s %10s%10s%10s\n" "---------------" "----------" "----------" "----------"# 数据行printf "%-15s %10d%10.2f %10.2f\n" "Notebook" 3 2.50 7.50printf "%-15s %10d%10.2f %10.2f\n" "Pen" 5 1.20 6.00printf "%-15s %10d%10.2f %10.2f\n" "Eraser" 2 0.50 1.00# 总计行printf "%-15s %10s%10s%10.2f\n" "" "" "Total:" 14.50

输出效果:

Item            Quantity      Price      Total--------------- ---------- ---------- ----------Notebook               3       2.50       7.50Pen                    5       1.20       6.00Eraser                 2       0.50       1.00                       Total:             14.50

2. 进度条实现

#!/bin/bashfor i in {1..20}; do    printf "\rProgress: [%-20s] %d%%" $(printf "%${i}s" | tr ' ' '#') $((i*5))    sleep 0.1doneprintf "\n"

执行效果:显示一个逐渐增长的进度条

3. 颜色输出

#!/bin/bashRED='\033[0;31m'GREEN='\033[0;32m'NC='\033[0m' # No Colorprintf "${RED}Error:${NC} Something went wrong\n"printf "${GREEN}Success:${NC} Operation completed\n"

4. 格式输出

printf "%-10s %-8s %-4s\n" 姓名 性别 体重kg  printf "%-10s %-8s %-4.2f\n" 郭靖 男 66.1234printf "%-10s %-8s %-4.2f\n" 杨过 男 48.6543printf "%-10s %-8s %-4.2f\n" 郭芙 女 47.9876

执行脚本,输出结果如下所示:

姓名     性别   体重kg郭靖     男      66.12杨过     男      48.65郭芙     女      47.99
  • %s %c %d %f 都是格式替代符,%s 输出一个字符串,%d 整型输出,%c 输出一个字符,%f 输出实数,以小数形式输出。

  • %-10s 指一个宽度为 10 个字符(- 表示左对齐,没有则表示右对齐),任何字符都会被显示在 10 个字符宽的字符内,如果不足则自动以空格填充,超过也会将内容全部显示出来。

  • %-4.2f 指格式化为小数,其中 .2 指保留 2 位小数。

# format-string为双引号printf "%d%s\n" 1 "abc"# 单引号与双引号效果一样printf '%d %s\n' 1 "abc"# 没有引号也可以输出printf %s abcdef# 格式只指定了一个参数,但多出的参数仍然会按照该格式输出,format-string 被重用printf %s abc defprintf "%s\n" abc defprintf "%s%s%s\n" a b c d e f g h i j# 如果没有 arguments,那么 %s 用NULL代替,%d 用 0 代替printf "%s and %d \n"

执行脚本,输出结果如下所示:

1 abc1 abcabcdefabcdefabcdefa b cd e fg h ij   and 0

printf 的转义序列

序列
说明
\a
警告字符,通常为ASCII的BEL字符
\b
后退
\c
抑制(不显示)输出结果中任何结尾的换行字符(只在%b格式指示符控制下的参数字符串中有效),而且,任何留在参数里的字符、任何接下来的参数以及任何留在格式字符串中的字符,都被忽略
\f
换页(formfeed)
\n
换行
\r
回车(Carriage return)
\t
水平制表符
\v
垂直制表符
\\
一个字面上的反斜杠字符
\ddd
表示1到3位数八进制值的字符。仅在格式字符串中有效
\0ddd
表示1到3位的八进制值字符
printf "a string, no processing:<%s>\n" "A\nB"a string, no processing:<A\nB>printf "a string, no processing:<%b>\n" "A\nB"a string, no processing:<AB>printf "www.zu.com \a"www.zu.com $                  #不换行

总结

概念
说明
示例
基本语法
printf "format" argsprintf "%s" "hello"
格式说明符
以%开头,指定数据类型和格式
%d
(整数), %f(浮点数)
转义字符
特殊字符表示
\n
(换行), \t(制表符)
字段宽度
控制输出最小宽度
%10s
(10字符宽)
精度控制
浮点数小数位数
%.2f
(2位小数)

常用格式说明符速查表

说明符
用途
示例输入
示例输出
%s
字符串
"text"text
%d
十进制整数
255255
%x
十六进制整数
255ff
%f
浮点数
3.141593.141590
%.2f
2位小数
3.141593.14
%c
单个字符
"A"A
%%
百分号
-
%

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  1. CONNECT:[ UseTime:0.001209s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001367s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000345s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.008469s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000668s ]
  6. SELECT * FROM `set` [ RunTime:0.009738s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000718s ]
  8. SELECT * FROM `article` WHERE `id` = 499837 LIMIT 1 [ RunTime:0.000604s ]
  9. UPDATE `article` SET `lasttime` = 1783027500 WHERE `id` = 499837 [ RunTime:0.011611s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.006085s ]
  11. SELECT * FROM `article` WHERE `id` < 499837 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005370s ]
  12. SELECT * FROM `article` WHERE `id` > 499837 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.009100s ]
  13. SELECT * FROM `article` WHERE `id` < 499837 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001190s ]
  14. SELECT * FROM `article` WHERE `id` < 499837 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002126s ]
  15. SELECT * FROM `article` WHERE `id` < 499837 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005189s ]
0.165156s