where is linux printf

Mar 10, 2023 am 09:05 AM
linux printf

linux printf在命令行中使用,该命令用于格式化打印数据;printf的命令格式是“printf FORMAT [ARGUMENT]...printf OPTION”,其中“help”选项表示显示帮助信息,“version”选项表示显示版本信息。

where is linux printf

本教程操作环境:linux5.9.8系统、Dell G3电脑。

linux printf 命令

1.命令简介

printf 格式化打印数据。

printf 与 C printf(3) 控制格式类似,具体也可以参考 printf(3) 的格式化控制字符。

2.命令格式

printf FORMAT [ARGUMENT]...
printf OPTION
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3.选项说明

--help
	显示帮助信息。
--version
	显示版本信息。
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FORMAT 格式部分和 C printf(3) 一样。

%b 相对应的参数被视为含有要被处理的转义序列之字符串。
%c ASCII 字符。显示相对应参数的第一个字符
%d, %i 十进制整数
%e, %E, %f 浮点格式。
%g %e或%f转换,看哪一个较短,则删除结尾的零。
%G %E或%f转换,看哪一个较短,则删除结尾的零。
%o 不带正负号的八进制值。
%s 字符串。
%u 不带正负号的十进制值。
%x 不带正负号的十六进制值,使用a至f表示10至15。
%X 不带正负号的十六进制值,使用A至F表示10至15。
%% 字面意义的%
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printf 支持的转义字符。

\"	双引号。\a	警告字符,通常为 ASCII 的 BEL 字符。\b	后退。\c	不显示输出结果中任何结尾的换行字符,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。\n	换行。\r	回车。\t	水平制表符。\v	垂直制表符。\\	反斜杠字符。
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4.常用示例

(1)输出字符串。

printf "hello world\n"hello world
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(2)输出字符串不换行。

printf "hello world"hello world
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(3)格式控制输出。

printf "hello %s\n" world
hello world
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(4)格式控制输出,并控制宽度。

printf "%-10s %-8s %-4s\n" 姓名 性别 "体重(kg)"姓名     性别   体重(kg)printf "%-10s %-8s %-4.2f\n" 杨过 男 68.6543杨过     男      68.65
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%-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。

(5)格式控制字符串也可用单引号括住。

printf '%d %s\n' 1 "hello world"1 hello world
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(6)输出数字。

printf "%d %f %e\n" 1 1.000000001 1.0000000011 1.000000 1.000000e+01
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小数位如果太长(数字总长度超过 8) 将被截断,我们可以指定小数位数。

printf "%d %.10f %e\n" 1 1.000000001 1.0000000011 1.0000000010 1.000000e+00
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(7)输出百分比。对 % 进行转义即可。

printf "%d%%\n" 80
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相关推荐:《Linux视频教程

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