Popen calls inconsistent with command-line calls

Linux but the command line is very powerful, so the job is to take popen call system functions to operate.

But there are times PS Aux|grep process time but always fail, replaced by PS ax but good time bad, write a foot originally PS, print output, and then program call script, is the same situation. But I try it on the command line, and I feel there is no logical problem.

Finally found that the program or script inside the call command, PS out of each line is truncated. Added parameter--columns 200 after resolution.

This article is from "Flying Justice Blog" blog, please be sure to keep this source http://xzq2000.blog.51cto.com/2487359/1766782

Popen calls inconsistent with command-line calls