Dear all,
suppose that I start a process (named "father"). "father" starts in turns a process called "child" with an execv call (after a fork). In this way "father" will be notified if "chlid" crashes (SIGCHILD mechanism). The problem is:
if "father" crashes, how can I do to be recreate a... (1 Reply)
Hi,
I need to get the pid of a process and have to store the pid in a variable and i want to use this value(pid) of the variable for some process. Please can anyone tell me how to get the pid of a process and store it in a variable. please help me on this.
Thanks in advance,
Amudha (7 Replies)
Hi All,
I have a master script , which would run 4 scripts in sequence. When the first script gets executed , I need to check if a particular process has been completed. If it is completed , only then proceed with the second script.
This same rule applies to script3 and script4.
Can someone... (4 Replies)
Hello,
I have a process a.out that runs from /a and /b
How can I get the pid of the one running from /a
ps -C /a/a.out
does not work
Thanks! (4 Replies)
Hi all,
I am having a little bit of trouble trying to find something out. I am trying to script a start/stop php file, for some gaming servers i host. The server have 2 lots of processes running on them, and the customers need to be able to start and stop them at their will.
So i know how to... (1 Reply)
I HAVE WRITTEN NINE PYTHON CODES TO PERFORM A TASK
........
I WISH TO RUN THEM SEQUENTIALLY.
eg. code1__code2 >>>>>>>>code9.py
TO GET DESIRED OUTPUT.
PLS HELP ME WRITTING SHELL SCRIPT ..
I HAVE TO DISTRIBUTE THESE CODE FOR BEING USED BY OTHERS. (2 Replies)
Hi,
I'm trying to write a script where i'm trying to grep the PID and the associated file and list them. Then execute the KILL command sequentially on the listed PID's for ".tra" files
====================================================
ps -aux | grep mine
adm 27739 0.2 0.8 1131588... (12 Replies)
Hi,
The problem detail is follows
I have three individual scripts .
SCRIPT A
sh -x sqoop_channels_nc_daily_01.sh & sh -x sqoop_channels_nc_daily_02.sh & sh -x sqoop_channels_nc_daily_03.sh
SCRIPT B
sh -x sqoop_contacts_nc_daily_01.sh & sh -x sqoop_contacts_nc_daily_02.sh & sh -x... (1 Reply)
Hi ,
I have prepared the following shell script to run the hqls in background.
These scripts are running Parallel but I want to run the hqls sequentially in background.
cat >cc_script.ksh
nohup hive -hiveconf rrdt=2016-06-12 -f /home/files/cust1.hql > home/log/cust1.log 2>&1 &
nohup hive... (6 Replies)
Discussion started by: ROCK_PLSQL
6 Replies
LEARN ABOUT CENTOS
unbuffer
UNBUFFER(1) General Commands Manual UNBUFFER(1)NAME
unbuffer - unbuffer output
SYNOPSIS
unbuffer program [ args ]
INTRODUCTION
unbuffer disables the output buffering that occurs when program output is redirected from non-interactive programs. For example, suppose
you are watching the output from a fifo by running it through od and then more.
od -c /tmp/fifo | more
You will not see anything until a full page of output has been produced.
You can disable this automatic buffering as follows:
unbuffer od -c /tmp/fifo | more
Normally, unbuffer does not read from stdin. This simplifies use of unbuffer in some situations. To use unbuffer in a pipeline, use the
-p flag. Example:
process1 | unbuffer -p process2 | process3
CAVEATS
unbuffer -p may appear to work incorrectly if a process feeding input to unbuffer exits. Consider:
process1 | unbuffer -p process2 | process3
If process1 exits, process2 may not yet have finished. It is impossible for unbuffer to know long to wait for process2 and process2 may
not ever finish, for example, if it is a filter. For expediency, unbuffer simply exits when it encounters an EOF from either its input or
process2.
In order to have a version of unbuffer that worked in all situations, an oracle would be necessary. If you want an application-specific
solution, workarounds or hand-coded Expect may be more suitable. For example, the following example shows how to allow grep to finish pro-
cessing when the cat before it finishes first. Using cat to feed grep would never require unbuffer in real life. It is merely a place-
holder for some imaginary process that may or may not finish. Similarly, the final cat at the end of the pipeline is also a placeholder
for another process.
$ cat /tmp/abcdef.log | grep abc | cat
abcdef
xxxabc defxxx
$ cat /tmp/abcdef.log | unbuffer grep abc | cat
$ (cat /tmp/abcdef.log ; sleep 1) | unbuffer grep abc | cat
abcdef
xxxabc defxxx
$
BUGS
The man page is longer than the program.
SEE ALSO
"Exploring Expect: A Tcl-Based Toolkit for Automating Interactive Programs" by Don Libes, O'Reilly and Associates, January 1995.
AUTHOR
Don Libes, National Institute of Standards and Technology
1 June 1994 UNBUFFER(1)