how to get process id in unix

In the Linux/unix system, each process has a unique process ID represented by a nonnegative integer. Although it is unique, the ID of the process can be reused. When a process terminates, its process ID can be used again. Most Linux/unix systems use

Many programming friends of Chen Hao asked me a few questions online. how do I learn Unix? How is Unix so difficult? How can we learn well? And let me give them some experience in learning Unix. Most of the time, I found that friends who asked these

Chen Hao Many programming friends asked me a few questions on the Internet. How do you learn Unix? How is Unix so difficult? How can we learn well? And let me give them some experience in learning Unix. In most cases, I found that my friends who

Recently, when I was watching apue, I saw 3.14 knots and fcntl.#include int fcntl (int fd, int cmd, .../* int arg */);Error returns-1, the specific return value depends on the cmd parameter.It refers to a cmd,fd_getfd fd_setfd returned by the file

A lot of programming friends on the internet asked me such a few questions,Unix how to learn? Why is Unix so hard? How can you learn? And let me give them some experience of learning Unix . Most of the time, I find that friends who ask these

In the previous chapters we learned that there is a correlation between processes: Each process has a parent process; When a child process exits, the parent process can perceive and get the exit status of the child process. In this

1 Progress Snapshot (process Accounting)When a process terminates, the kernel saves some data for the process, including a small portion of the command's binary data, CPU time, startup times, user ID, and group ID. Such a process is called process

Actual user ID, valid user ID, and set user ID   These concepts are often encountered when reading Unix-related books, but these concepts have not been properly clarified, so that they have been completely understood. I have made a distinction

UNIX advanced environment programming (11) Process Control-Process snapshot, User Identifier, Process scheduling, unixprocess 1. Process Accounting) When a process is terminated, the kernel saves some data for the process, including a small portion

Oracle|unix|window Ian Adam, SAIC Ltd David Stien, SAIC Ltd Translation: Fenng Summary Oracle is the leading database system on a well-known UNIX hardware platform. Oracle users and administrators are therefore familiar with the Oracle