文件`/proc/{processId}/cmdline`的长度限制是多少？

Question

我有一个java进程，它的classpath包含很多jar，所以启动命令很长。

假设进程id是110101，当我通过命令cat /proc/110101/cmdline查看命令时，我发现命令不完整，它只包含大约4000个字符。

还有其他方法可以显示原来的启动命令吗？

Answer 1

 man proc

 /proc/[pid]/cmdline
              This holds the complete command line for the process, unless
              the process is a zombie.  In the latter case, there is nothing
              in this file: that is, a read on this file will return 0
              characters.  The command-line arguments appear in this file as
              a set of strings separated by null bytes ('\0'), with a
              further null byte after the last string.

它可能不会通过 cat 文件为您提供所有参数。