The parent application can set up standard output of the shell script to be the write end of a pipe that the parent can use to read status from the child.
The parent can create a named pipe (or regular file) and pass the name of that file to the shell script as an operand. The child can then write status to that file and the parent can read status from that file.
The parent can set up a signal catching function for a signal and pass its process ID to the child shell script. The child can then use:
to notify the parent that some milestone has been reached.
Use your imagination... There are lots of ways for one process to talk to another process.
This User Gave Thanks to Don Cragun For This Post:
AIX 4.3.3
I am trying to write a signal handler into a ksh shell script. I would like to capture the SIGTERM, SIGINT, and the SIGTSTP signals, print out a message to the terminal, and continue executing the script. I have found a way to block the signals:
#! /bin/ksh
SIGTERM=15
SIGINT=2... (2 Replies)
Helo,
I want to write shell script which takes back of all binaries (exe files).
and when i uninstall the upgraded system which automatically restore the old binary which we have take as back up.
can u tell me how to write such shell scripts.
Regards,
Amit (5 Replies)
I need to write a c program that uses the fork and excel system calls to run the shell script mode invoked like this: "./mode 644 ls -l" (that is the argumetns will always be 644 ls -l)
here's the mode script:
#!/bin/sh
octal="$1"
shift
find . -maxdepth 1 -perm $octal -exec $@ {} \;
... (3 Replies)
Hi ,
I do have a shell which test the connectivity using ssh, soon after the login it should use the keys Ctrl + z or Ctrl + c to exit from login promt. So how do i need to implement these . (3 Replies)
Hi ,
i have a scenario where...i have to put a check where if script is executing more than 15mins i have to kill that script and n retry again 2nd time.
i this case i can use background process to do it but i feel trap will be the efficent way to do so...
but i dont know much about it... (1 Reply)
When command is executed by forking, the console displays the status of that command. I want to suppress it.. how to do it ?
Example:
var1=`date` &
echo "hello world";
output:
hello world
+ Done var1=`date`
I want to suppress the second line "+ Done var1=`date`".
I... (10 Replies)
Hi, I'm writing a shell script where I want to call fork(). However I wrote like this "var=fork()" in c style and got this error:
"syntax error near unexpected token `(' "
How could I call fork() in shell script? Thanks in advance.
Duplicate Post - Continue Here - Please Do Not Cross Post... (0 Replies)
Hi, I'm writing a shell script where I want to call fork(). However I wrote like this "var=fork()" in c style and got this error:
"syntax error near unexpected token `(' "
How could I call fork() in shell script? Thanks in advance. (2 Replies)
Hi All,
I have a shell script(test_abc.sh) with the following shell commands, which are invoking the same shell script with different parameters.
test_abc.sh
. ./test.sh abc >> test.log
. ./test.sh xyz >> test.log
. ./test.sh pys >> test.log
. ./test.sh abc >> test.log
.
.
... (4 Replies)
Discussion started by: dev.devil.1983
4 Replies
LEARN ABOUT BSD
fork
FORK(3F)FORK(3F)NAME
fork - create a copy of this process
SYNOPSIS
integer function fork()
DESCRIPTION
Fork creates a copy of the calling process. The only distinction between the 2 processes is that the value returned to one of them
(referred to as the `parent' process) will be the process id of the copy. The copy is usually referred to as the `child' process. The
value returned to the `child' process will be zero.
All logical units open for writing are flushed before the fork to avoid duplication of the contents of I/O buffers in the external file(s).
If the returned value is negative, it indicates an error and will be the negation of the system error code. See perror(3F).
A corresponding exec routine has not been provided because there is no satisfactory way to retain open logical units across the exec. How-
ever, the usual function of fork/exec can be performed using system(3F).
FILES
/usr/lib/libU77.a
SEE ALSO fork(2), wait(3F), kill(3F), system(3F), perror(3F)4.2 Berkeley Distribution May 27, 1986 FORK(3F)