I have two shell scripts : A.sh and B.sh
A.sh
echo "In A"
exec B.sh
echo "After B"
B.sh
echo "In B"
The output is : In A
In B
I want the output : In A
In B
After B (4 Replies)
Hi
I have a shell script A which calls another 10 shell scripts which run in background. How do i make the parent script wait for the child scripts complete, or in other words, i must be able to do a grep of parent script to find out if the child scripts are still running.
My Code:
... (1 Reply)
Hi
I have a shell script A which calls another 10 shell scripts which run in background. How do i make the parent script wait for the child scripts complete, or in other words, i must be able to do a grep of parent script to find out if the child scripts are still running.
My Code:
... (5 Replies)
Hi All,
I have a script which calls a child script with a parameter to be run in the background
. childscript.ksh $a &
Can any one suggest me how do i export a variable from the child script to parent script?
Note that the child script is in background
If the child script is in... (3 Replies)
Hi everyone
i am very new to linux , working on bash shell.
I am trying to solve the given problem
1. Create a process and then create children using fork
2. Check the Status of the application for successful running.
3. Kill all the process(threads) except parent and first child... (2 Replies)
Hello all; hope someone can help me cause I am going crazy trying to find a solution for (what I think is simple) issue...looked hard up and down this forum and tried several "solutions" with no avail...so here's my issue:
I have this (parent) script: copylsofdcmcadefttosftpwithmove.sh
... (3 Replies)
I am having a parent scripts which reads a file with child scripts name.
I need to read one by one child script , execute it and
1. If child script fails send mail to the team with the log file
2. If the child script executes fine then proceed with the next child script execution.
#!... (3 Replies)
I have requirement where I need to fail parent if any one of the child process fails. Here is the code snippet
for i in 1 2 3 4 5 6 7 8 9 10
do
child_script $i &
done
wait
I need to fail my main script if any one of my child process fails (8 Replies)
Discussion started by: gvkumar25
8 Replies
LEARN ABOUT FREEBSD
fork
FORK(2) BSD System Calls Manual FORK(2)NAME
fork -- create a new process
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
pid_t
fork(void);
DESCRIPTION
The fork() system call causes creation of a new process. The new process (child process) is an exact copy of the calling process (parent
process) except for the following:
o The child process has a unique process ID.
o The child process has a different parent process ID (i.e., the process ID of the parent process).
o The child process has its own copy of the parent's descriptors. These descriptors reference the same underlying objects, so that,
for instance, file pointers in file objects are shared between the child and the parent, so that an lseek(2) on a descriptor in the
child process can affect a subsequent read(2) or write(2) by the parent. This descriptor copying is also used by the shell to
establish standard input and output for newly created processes as well as to set up pipes.
o The child process' resource utilizations are set to 0; see setrlimit(2).
o All interval timers are cleared; see setitimer(2).
o The child process has only one thread, corresponding to the calling thread in the parent process. If the process has more than one
thread, locks and other resources held by the other threads are not released and therefore only async-signal-safe functions (see
sigaction(2)) are guaranteed to work in the child process until a call to execve(2) or a similar function.
RETURN VALUES
Upon successful completion, fork() returns a value of 0 to the child process and returns the process ID of the child process to the parent
process. Otherwise, a value of -1 is returned to the parent process, no child process is created, and the global variable errno is set to
indicate the error.
ERRORS
The fork() system call will fail and no child process will be created if:
[EAGAIN] The system-imposed limit on the total number of processes under execution would be exceeded. The limit is given by the
sysctl(3) MIB variable KERN_MAXPROC. (The limit is actually ten less than this except for the super user).
[EAGAIN] The user is not the super user, and the system-imposed limit on the total number of processes under execution by a single
user would be exceeded. The limit is given by the sysctl(3) MIB variable KERN_MAXPROCPERUID.
[EAGAIN] The user is not the super user, and the soft resource limit corresponding to the resource argument RLIMIT_NPROC would be
exceeded (see getrlimit(2)).
[ENOMEM] There is insufficient swap space for the new process.
SEE ALSO execve(2), rfork(2), setitimer(2), setrlimit(2), sigaction(2), vfork(2), wait(2)HISTORY
The fork() function appeared in Version 6 AT&T UNIX.
BSD May 31, 2013 BSD