From 3f34bb5508b7badbc0e50cd03a1172eed0fc588c Mon Sep 17 00:00:00 2001 From: GOLinux Date: Mon, 11 Aug 2014 20:25:10 +0800 Subject: [PATCH] Translated:20140811 Echo Command with Practical Examples.md --- ...11 Echo Command with Practical Examples.md | 79 ++++++++++--------- 1 file changed, 40 insertions(+), 39 deletions(-) rename {sources => translated}/tech/20140811 Echo Command with Practical Examples.md (50%) diff --git a/sources/tech/20140811 Echo Command with Practical Examples.md b/translated/tech/20140811 Echo Command with Practical Examples.md similarity index 50% rename from sources/tech/20140811 Echo Command with Practical Examples.md rename to translated/tech/20140811 Echo Command with Practical Examples.md index df6d11316f..eafffabb79 100644 --- a/sources/tech/20140811 Echo Command with Practical Examples.md +++ b/translated/tech/20140811 Echo Command with Practical Examples.md @@ -1,77 +1,78 @@ - -Translating by GOLinux ... -Echo Command with Practical Examples +Echo命令实例 ================================================================================ -echo command is built in **shell command** , which is used to display the value of a **variable** or **print a line of text**. -Echo command plays a important role in building a shell script. +echo命令是内建的**shell命令**，用于显示**变量**的值或者**打印一行文本**。 + +echo命令在构建shell脚本时扮演着重要的角色。 -### Synatx : ### +### 语法： ### # echo [Options] [String] -The items in square brackets are optional. A string can be defined as finite sequence of characters (like letters, numerals, symbols punctuation marks). +方括号中的项目是可选的。字符串可以定义为字符的有限序列（如字母，数字，符号，标点符号）。 -When echo command is used without any options or strings, echo returns a blank line on the display screen followed by the command prompt on the subsequent line. This is because pressing the ENTER key is a signal to the system to start a new line, and thus echo repeats this signal. +当echo命令不带任何选项或字符串使用时，它会在显示屏上返回一个空白行，后面换一行跟上命令提示符。这是因为按下回车键就是发送一个信号给系统以开始一个新行，而echo重复了该信号。 -### Options : ### +### 选项： ### -- -n do not output the trailing newline -- -e enable interpretation of backslash escapes -- -E disable interpretation of backslash escapes (default) +- -n 不要输出衍生的新行 +- -e 启用反斜线转义解释 +- -E 禁用反斜线转义解释（默认） -If -e is in effect, the following sequences are recognized: -- \\ backslash -- \a alert (BEL) -- \b backspace -- \c produce no further output -- \e escape -- \f form feed -- \n new line -- \r carriage return -- \t horizontal tab -- \v vertical tab -- \0NNN byte with octal value NNN (1 to 3 digits) -- \xHH byte with hexadecimal value HH (1 to 2 digits) +如果-e生效，下列序列被识别： -### Example :1 Display the value of System Defined Variables ### +- \\ 反斜线 +- \a 警告（BEL） +- \b 反斜线 +- \c 不产生进一步输出 +- \e 转义 +- \f 换页 +- \n 新行 +- \r 换行字符 +- \t 水平制表 +- \v 垂直制表 +- \0NNN 八进制值表示的字节NNN（1到3个数字） +- \xHH 十六进制值表示的字节NNN（1到2个数字） -Using the set command , we can list the system define variables and to print the vaule of these variables we can use echo command : +### 样例：1 显示系统定义的变量的值 ### + +使用set命令，我们可以列出系统定义的变量。而要打印这些变量的值，我们可以使用echo命令： jack@localhost:~$ echo $USER jack jack@localhost:~$ echo $HOME /home/jack -### Example:2 Display the value of User defined Variables : ### +### 样例：2 显示用户定义的变量的值 ### jack@nextstep4it:~$ var1=`date` jack@nextstep4it:~$ echo "Today's date time is : $var1" Today's date time is : Mon Jul 28 13:11:37 IST 2014 -### Example:3 Display the text String ### +### 样例：3 显示文本字符串 ### jack@nextstep4it:~$ echo " Hi this echo command testing" Hi this echo command testing -### Example:4 Use of backspace in echo command ### +### 样例：4 在echo命令中使用反斜线 ### jack@nextstep4it:~$ echo -e "Ubuntu \bis \bthe \bbest \bDesktop \bOS" -Above Command will Print : +上述命令将打印： + UbuntuisthebestDesktopOS -### Example:5 Use of tab space in echo command ### +### 样例：5 在echo命令中使用制表符空格 ### nextstep4it@nextstep4it:~$ echo -e "Ubuntu \tis \tthe \tbest \tDesktop \tOS" -Above command will show below output : +上述命令将显示如下输出： Ubuntu is the best Desktop OS -### Example:6 Use of Vertical tab in echo Command ### +### 样例：6 在echo命令中使用垂直制表符 ### jack@nextstep4it:~$ echo -e "Ubuntu \vis \vthe \vbest \vDesktop \vOS" Ubuntu @@ -81,9 +82,9 @@ Ubuntu is the best Desktop OS Desktop OS -### Example:7 Colored output of echo command ### +### 样例：7 设置echo命令彩色输出 ### -echo command can change the font style, background color of fonts and font colors. Escape sequence \033 can be used to alter font properties. -e option has to be used in order to the escape sequence be in effect. Some of escape codes are listed below : +echo命令可以修改字体类型，字体背景色以及字体颜色，转义序列\033可以用于改变字体属性。要使转义序列生效，必须使用-e选项。下面列出了部分转义代码： - [0m: Normal - [1m: Bold fonts @@ -110,12 +111,12 @@ echo command can change the font style, background color of fonts and font color - [46m: Background color changes to Sky Blue - [47m: Background color changes to Light Grey -Below command will print the output in red color. +下面的命令将用红色打印输出。 jack@nextstep4it:~$ echo -e "\033[31mMagic of Linux\033[0m" Magic of Linux -Below Command will print “Magic of Linux” in bold style and red background color. +下面的命令将以粗体以及红色背景打印出“Magic of Linux”。 nextstep4it@nextstep4it:~$ echo -e "\033[1m\033[41mMagic of Linux\033[0m" Magic of Linux @@ -124,7 +125,7 @@ Below Command will print “Magic of Linux” in bold style and red background c via: http://www.nextstep4it.com/categories/unix-command/echo-command/ -译者：[译者ID](https://github.com/译者ID) +译者：[GOLinux](https://github.com/GOLinux) 校对：[校对者ID](https://github.com/校对者ID) 本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出