具有未知可变长度的水平和垂直行距答案

【问题标题】：Horizontal and Vertical Line Spacing with a unknown variable length具有未知可变长度的水平和垂直行距
【发布时间】：2019-08-23 13:14:44
【问题描述】：

我正在尝试以特定格式打印输出，其中输出位于封闭框中。我正在使用“|”和“-”用于创建它。我在“|”之间打印的输出是具有不同字符数的变量。这弄乱了我的格式。

我试过下面的代码

nodename=$(hostname)
cpu=$(cat /proc/cpuinfo | awk '/^processor/{print $3}' | wc -l)
echo " ------------------------------------------------------------------"  
echo "|                                                                  |" 
echo "|          This is Bash Scripting                                  |" 
echo "|                                                                  |" 
echo "|  1 - This Machine Name is $nodename                              |" 
echo "|  2 - This Machine has $cpu CPU's                                 |"
echo "|                                                                  |" 
echo " -------------------------------------------------------------------"

实际结果

" ------------------------------------------------------------------"  
"|                                                                  |" 
"|          This is Bash Scripting                                  |" 
"|                                                                  |" 
"|  1 - This Machine Name is test                              |" 
"|  2 - This Machine has 8 CPU's                                 |"
"|                                                                  |" 
" -------------------------------------------------------------------"

预期结果

" ------------------------------------------------------------------"  
"|                                                                  |" 
"|          This is Bash Scripting                                  |" 
"|                                                                  |" 
"|  1 - This Machine Name is test                                   |" 
"|  2 - This Machine has 8 CPU's                                    |"
"|                                                                  |" 
" -------------------------------------------------------------------"

【问题讨论】：

Bash add trailing spaces to justify string、How do I print some text in bash and pad it with spaces to a certain width?、Padding characters in printf、Formatting output with printf: truncating or padding等
grep -c processor /proc/cpuinfo。一个过程而不是三个。您不需要awk 来提取处理器编号，因为您所做的只是计算有多少个。

标签： linux bash sh width spacing

【解决方案1】：

使用printf 代替echo：

printf "|  1 - This Machine Name is %-39s|\n" "$nodename"

您可以使用%-39s 指定正确的空格填充

【讨论】：