Assuming that you have no other background processes, you can use the wait command to ensure all the 20 that you have just started have completed, a bit like this:-
All untested, but it might help.
hi,
how would i go about making a loop which gets each line from a single text file, set it to a variable and then print it to screen?
thanks
eg:
#!/bin/sh
FILE="somefile.txt"
text_line=""
what kind of loop would use here? (18 Replies)
while
do
print What is the next device number to be added to $dgroup?
print Press \<Enter\> if there are no more devices to be added.
read dev_num
export dev_num
symld -g $dgroup -sid $sname add dev $dev_num
done
In this while... (2 Replies)
Hi, I am writing a bash shell script. I will have a section of code devoted to a for loop:
for FILE in *.hdf *.L2; do
echo hello world
done
The complication is that sometimes there will not be any files with a ".hdf" extension, or sometimes there won't be any with a ".L2" extension. Since... (4 Replies)
Hi all
Sorry for the basic question, but i am writing a shell script to get around a slightly flaky binary that ships with one of our servers. This particular utility randomly generates the correct information and could work first time or may work on the 12th or 100th attempt etc !.... (4 Replies)
I am struggling with the for loop. I have a file name heros.txt and I would like to go through a list in file where.txt and see if I can find the name from where inside heros.
One of the problems that I am having is I dont understand how to setup the for loop to find the list to search.:wall:
... (6 Replies)
Hi,
I have a requirement where I have to check for 10 files in Unix location. If all of the files present in that directory then i have execute another process.
can you help me resolving this issue.
sample
location
/home/usr
abc.txt
cde.txt
aaaa.txt
lll.txt
ooo.txt
if all the... (3 Replies)
Hi,
I have code like below
disk_list=$(ls /root/file1)
for disk in $disk_list
do
pvcreate $i
done
I know what pvcreate command does, but I do not understand what this $i do here. can someone please explain. (2 Replies)
Hi I have script
if ; then
echo "Found Node"
else
echo "Sorry this is not a node"
I need to add conditions "nn" ,"rm", and "hh" in the same line along with "hd" .Can this be done or do I need to use elif (1 Reply)
Discussion started by: Dublin4320
1 Replies
LEARN ABOUT OSX
tcl_waitpid
Tcl_DetachPids(3) Tcl Library Procedures Tcl_DetachPids(3)__________________________________________________________________________________________________________________________________________________NAME
Tcl_DetachPids, Tcl_ReapDetachedProcs, Tcl_WaitPid - manage child processes in background
SYNOPSIS
#include <tcl.h>
Tcl_DetachPids(numPids, pidPtr)
Tcl_ReapDetachedProcs()
Tcl_Pid
Tcl_WaitPid(pid, statusPtr, options)
ARGUMENTS
int numPids (in) Number of process ids contained in the array pointed to by pidPtr.
int *pidPtr (in) Address of array containing numPids process ids.
Tcl_Pid pid (in) The id of the process (pipe) to wait for.
int *statusPtr (out) The result of waiting on a process (pipe). Either 0 or ECHILD.
int options (in) The options controlling the wait. WNOHANG specifies not to wait when checking the process.
_________________________________________________________________DESCRIPTION
Tcl_DetachPids and Tcl_ReapDetachedProcs provide a mechanism for managing subprocesses that are running in background. These procedures
are needed because the parent of a process must eventually invoke the waitpid kernel call (or one of a few other similar kernel calls) to
wait for the child to exit. Until the parent waits for the child, the child's state cannot be completely reclaimed by the system. If a
parent continually creates children and doesn't wait on them, the system's process table will eventually overflow, even if all the children
have exited.
Tcl_DetachPids may be called to ask Tcl to take responsibility for one or more processes whose process ids are contained in the pidPtr
array passed as argument. The caller presumably has started these processes running in background and does not want to have to deal with
them again.
Tcl_ReapDetachedProcs invokes the waitpid kernel call on each of the background processes so that its state can be cleaned up if it has
exited. If the process has not exited yet, Tcl_ReapDetachedProcs does not wait for it to exit; it will check again the next time it is
invoked. Tcl automatically calls Tcl_ReapDetachedProcs each time the exec command is executed, so in most cases it is not necessary for
any code outside of Tcl to invoke Tcl_ReapDetachedProcs. However, if you call Tcl_DetachPids in situations where the exec command may
never get executed, you may wish to call Tcl_ReapDetachedProcs from time to time so that background processes can be cleaned up.
Tcl_WaitPid is a thin wrapper around the facilities provided by the operating system to wait on the end of a spawned process and to check a
whether spawned process is still running. It is used by Tcl_ReapDetachedProcs and the channel system to portably access the operating sys-
tem.
KEYWORDS
background, child, detach, process, wait
TclTcl_DetachPids(3)