1. IntruductionExitmakeShell(script) to exit with a specified status value, Execute without parametersExitwhen, Shellor the script exits with the status value of the last execution command. Shellbefore exiting, Trapcan huntEXITsignal. 0indicates
Original link: http://codingstandards.iteye.com/blog/836625 (reproduced please specify the source)Description of UseThe exit command exits the current shell and can terminate the current script execution in a shell script.Common parametersFormat:
Reclaim process user space resource exit () function _ exit () function atexit () function on_exit () function, _ exitatexitAbstract:This article describes how to terminate a process and how to use the exit () function to terminate the process and
Abstract:This article describes how to terminate a process and how to use the exit () function to terminate the process and reclaim the user space resources of the process. It analyzes the exit () function and the _ exit () function, difference in
Exit is used to end a script in which the script terminates immediately when the Exit command is encountered, and the terminating exit status depends on the number following the Exit command;Exit [n]: Custom exit status code;An example is described.1
Differences between exit () and _ exit ()
Linux source code
# DEFINE _ nr_exit 1
# DEFINE _ nR _ exit _ nr_exit/* from the File Include/asm-i386/unistd. H */"_ NR _" is the prefix for each system call in the Linux source code. Note that there are
/Usr/libexec/gconf-sanity-check-2 exit status 256 resolution after CentOS is started displays/usr/libexec/gconf-sanity-check-2 exit status 256. X-windows cannot be entered. Cause: some files under/tmp are deleted when the NFS server is set up...
Linux Shell Bash with special meaning exit code purpose descriptionThe exit command exits the current shell and can terminate the current script execution in a shell script.Common parametersFormat: Exit nExit. Set the exit code to N. (cause the
Process 1 is the main first process init of all processes
How to view the process: PS uax
# Include # Include # Include # Include
Int main (){Pid_t PID;Int A = 8;Printf ("current process ID: % d \ n", getpid ());PID = fork ();If (pid> 0) // What
1. Graceful exit of the process 1.1.kill-9 PID problemsIt is easy and efficient to force a process to be killed by Kill-9 PID on Linux, so many program stop scripts often choose how to use the kill-9 PID.Whether the Kill-9 PID of Linux or the
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