bash 是否可以增加 ksh 变量接受的最大字符数？
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Is it possible to increase the maximum number of characters that ksh variable accepts?
提问by javapadawan
This is a follow up question to
这是一个后续问题
What is the maximum number of characters that the ksh variable accepts?
I checked my environment and it's allowing only
我检查了我的环境，它只允许
#include <sys/limits.h>
$ cpp << HERE | tail -1
> #include <limits.h>
> ARG_MAX
> HERE
1048576
Is there a way to increase this? Or any alternatives for
有没有办法增加这个？或任何替代品
while read line;
do
#parse logic
done < $filename
To handle really long lines? Based from the records I'm parsing it will not stop at 2M character lines.
处理很长的线路？根据我正在解析的记录，它不会在 2M 字符行处停止。
Environment Details :
环境详情：
AIX $ KSH Version M-11/16/88f
采纳答案by Basile Starynkevitch
You could compile a Linux 3.7.x kernel, and edit its include/uapi/linux/limits.hfile to increase the ARG_MAXargument (to some bigger power of two, e.g. 2097152). But you should rather have a lot of RAM (e.g. 8GBytes) if you want to increase it more.
您可以编译 Linux 3.7.x 内核，并编辑其include/uapi/linux/limits.h文件以增加ARG_MAX参数（到更大的 2 次方，例如 2097152）。但是，如果您想增加更多内存，您应该拥有大量 RAM（例如 8GBytes）。
The actual limit is related to execve(2). That man page has a paragraph on it.
实际限制与execve(2) 相关。该手册页上有一段。
But you could probably avoid having huge shell variables (in the Unix environment). Did you consider using some other tool (awk, python, perl....) to read your file? Their variable environment is not the shell environment transmitted to forked programs, so they can have variables with very long values. Maybe kshhas some builtin (unexport) to avoid exporting some variable into the Unix environment.
但是您可能可以避免使用巨大的 shell 变量（在 Unix 环境中）。您是否考虑过使用其他工具 ( awk, python, perl....) 来读取您的文件？它们的变量环境不是传递给分叉程序的 shell 环境，因此它们可以具有非常长的值的变量。也许ksh有一些内置 ( unexport) 以避免将某些变量导出到 Unix 环境中。
