使用"printf"用于android shell中的十六进制值 [英] Using "printf" for hex values in android shell

问题描述

我正在将我的shell脚本(相当大的shell脚本)从bash移植到android shell(mksh shell).

I am porting my shell script (quite big shell script) from bash to android shell (mksh shell).

在Android中，printf的工作方式似乎与其他Linux系统不同.

In Android, printf does not seem to be working the same way as it works in other Linux systems.

$ cat sample.sh 
...
func1()
{
    A=100
    HEXA=`printf "%04x" ${A}`
    echo "A - ${A} HEXA - ${HEXA}"
}

func1

此函数的输出如下.

$ ./sample.sh
A - 100 HEXA - 300000078

它正在打印一个非常奇怪的数字.

It is printing a really weird number.

我从其他帖子和mksh的联机帮助页中看到，不建议在mksh中使用printf.我的Shell脚本很大，正在大量使用它.因此，我想以某种方式处理此问题.我有什么选择来解决这个问题?

I saw from other posts and from the manpage of mksh that printf is not recommended to be used in mksh. My shell script, which is quite big, is using it very heavily. So, I want to handle this somehow. What are my options to handle this?

推荐答案

在toybox中修复printf很棒.

但是，如果有人想打印出转换为 hex 的数字(或者，如果可以的话，可以打印几乎所有其他合理的 base 从2到36的数字)在具有旧toybox(或完全没有toybox)的根植的设备上倾斜-这是一种使用mksh内置的typeset来完成此操作的方法:

But in case anyone would like to print out a number converted to hex (or pretty much any other reasonable base from 2 to 36 if they would be so inclined) on an unrooted device with the old toybox (or no toybox at all) - here is a way how to do it using typeset built-in of mksh:

baseconv(){ typeset -Ui${3:-16} -Z35 x=$1; echo ${x: -${2:-8}};}

func1()
{
    A=100
    HEXA=$(baseconv $A 4 16)
    echo "A - ${A} HEXA - ${HEXA}"
}

或仅针对printf "%04x"情况设置特定功能:

or just make a specific function for the printf "%04x" case:

printf04x(){ typeset -Ui16 -Z7 x=$1; echo ${x: -4};}

func1()
{
    A=100
    echo "A - ${A} HEXA - $(printf04x $A)"
}

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