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Environment cannot be returned from a child process (called process) to its parent process.
Only a return value (integer) and output text can be returned.
The following includes ./callingscript.sh within ./masterscript.sh:
Note the . before ./callingscript.sh, it means sourcing, not calling.
How do i get the value of the variable from the called script(script2) to the calling script(script1) in ksh ?
I've given portion of the script here to explain the problem.
Portion of Script 1
=============
-----
-----
tmp=`a.ksh p1 p2 p3`
if then
# error processing
fi
-----... (10 Replies)
Hi all,
I have two ksh scripts
#sample1.sh
#!/bin/ksh
. ./sample2.sh
echo $fileExist
#sample2.sh
#!/bin/ksh
func()
{
i=1
return $a
}
func
echo $?
Here how should I return the value of sample2.sh back to sample1.sh?
Thanks in advance. (2 Replies)
Hi Guys,
I am new to unix and would like to know the basics about calling a shell script from another shell script.
I would like to know if the calling script can finish in any way before the called script actually gets executed completely. I want this to happen :cool:
For Example :... (1 Reply)
Having issues with an expect script. I've been scripting bash, python, etc... for a couple years now, but just started to try and use Expect. Trying to create a script that takes in some arguments, and then for now, just runs a pwd command(for testing, final will be command I pass).
Here is... (0 Replies)
I am using blow script :--
#!/bin/bash
FIND=$(ps -elf | grep "snmp_trap.sh" | grep -v grep) #check snmp_trap.sh is running or not
if
then
# echo "process found"
exit 0;
else
echo "process not found"
exec /home/Ketan_r /snmp_trap.sh 2>&1 & disown -h ... (1 Reply)
Hi all,
Warm regards!
I am in a difficult situation here. I have been trying to create a shell script which calls another shell script inside. Here is a simplified version of the same.
Calling Script.
#!/bin/ksh
# want to run as a different process... (6 Replies)
Hi,
I am trying to capture logs of the script in the file as well as on the screen. I have used exec and tee command for this. While using exec command I am getting the correct output in the file but, script output is not getting displayed on the screen as it get executed.
Below is my sample... (14 Replies)
Hi, I've got a Bash backup script I'm trying to run on a directory via a cron job nightly. If I ssh in and run the script manually it works flawlessly. If I set up the cron to run evertything is totally messed up I don't even know where to begin.
Basically the path structure is
... (6 Replies)
I want to make a config file which contain all the paths.
i want to read the config file line by line and pass as an argument on my below function.
Replace all the path with reading config path line by line and pass in respective functions.
how can i achieve that?
Kindly guide.
... (6 Replies)
Need ideas on how to achieve the below.
We have a script say "profile.sh" which internally calls another existing script called "name.sh" which prompts for the
name and age of a person upon execution. When i run profile.sh how can i populate a pre-defined value from another file and pass that... (1 Reply)
Discussion started by: sankasu
1 Replies
LEARN ABOUT NETBSD
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
fork() 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).
In general, the child process should call _exit(2) rather than exit(3). Otherwise, any stdio buffers that exist both in the parent and child
will be flushed twice. Similarly, _exit(2) should be used to prevent atexit(3) routines from being called twice (once in the parent and once
in the child).
In case of a threaded program, only the thread calling fork() is still running in the child processes.
Child processes of a threaded program have additional restrictions, a child must only call functions that are async-signal-safe. Very few
functions are asynchronously safe and applications should make sure they call exec(3) as soon as possible.
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
fork() 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. This limit is configuration-depen-
dent.
[EAGAIN] The limit RLIMIT_NPROC on the total number of processes under execution by this user id would be exceeded.
[ENOMEM] There is insufficient swap space for the new process.
SEE ALSO execve(2), setrlimit(2), vfork(2), wait(2), pthread_atfork(3)STANDARDS
The fork() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').
HISTORY
A fork() system call appeared in Version 6 AT&T UNIX.
BSD June 10, 2004 BSD