Capturing the output of a background job


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Capturing the output of a background job
# 8  
Old 09-08-2011
Have you considered using expect it's very good for this sort of thing.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Capturing the return code from background process

Hi All, I was out not working on unix from quite sometime and came back recently. I would really appreciate a help on one of the issue I am facing.... I am trying to kick off the CodeNameProcess.sh in PARALLEL for all the available codes. The script runs fine in parallel. Let say there are... (1 Reply)
Discussion started by: rkumar28
1 Replies

2. Shell Programming and Scripting

Background job issue

How to bring a backgroud job say sample_script.sh to foreground (4 Replies)
Discussion started by: rafa_fed2
4 Replies

3. Shell Programming and Scripting

Background Job

Hello Everyody, Having a doubt. sort file1 & when we sent a job to the background it returns Job Number PID again if we want to ... (1 Reply)
Discussion started by: knroy10
1 Replies

4. Shell Programming and Scripting

Capturing the exit status of the script running in background

Hi All, I have a scenario where I am executing some child shell scripts in background (using &)through a master parent script. Is there a way I can capture the exit status of each individual child script after the execution is completed. (2 Replies)
Discussion started by: paragkalra
2 Replies

5. Shell Programming and Scripting

Send Foreground job to background redirecting output

I have many CPU intensive processes running and sometimes I run them in the foreground so that I can see what the output is. I want to send that foreground process to the background, but also have it direct the output to a logfile. I know to send something to the bg I do Ctrl-z on the FG... (6 Replies)
Discussion started by: jhullbuzz
6 Replies

6. Shell Programming and Scripting

capturing output from top and format output

Hi all, I'd like to capture the output from the 'top' command to monitor my CPU and Mem utilisation.Currently my command isecho date `top -b -n1 | grep -e Cpu -e Mem` I get the output in 3 separate lines.Tue Feb 24 15:00:03 Cpu(s): 3.4% us, 8.5% sy .. .. Mem: 1011480k total, 226928k used, ....... (4 Replies)
Discussion started by: new2ss
4 Replies

7. Shell Programming and Scripting

Cannot submit a background job

Hi all, I am currently facing a problem when i am submitting a script to run in the background to collect statistics round the clock on an AIX box. I don't have root authority nor can I set it in cron. So when i submit the job, it runs fine, but won't let me signoff. It prompts me that... (2 Replies)
Discussion started by: tansha
2 Replies

8. UNIX for Dummies Questions & Answers

background job

on gnome i open a terminal and run wget http://soommmething & in the background. because wget shows me downloading progress percentage and download speed continuously, I exit the gnome-terminal after a while i want to see the download percentage but dont know how. my ps -u myname shows that... (3 Replies)
Discussion started by: babayeve
3 Replies

9. UNIX for Dummies Questions & Answers

Background job

Hiya, Recently I've run a few scripts in the foreground, but have realised later they should of been better nohup'd and placed in the background. I understand how to change a foreground job into a background one, but how would put the job into the nohup state? Thanks (1 Reply)
Discussion started by: rdbooth
1 Replies

10. UNIX for Dummies Questions & Answers

background job

I try to run a script as background job. script: #!/usr/bin/csh /usr/bin/date +20%y-%m-%d > ~/datsql.txt If I start it I got this output: tac> ./datermitteln& 293 + Stopped (SIGTTOU) ./datermitteln& I insert the following line inside my script, but without any... (3 Replies)
Discussion started by: joerg
3 Replies
Login or Register to Ask a Question
wait(1)                                                            User Commands                                                           wait(1)

NAME
wait - await process completion SYNOPSIS
/bin/sh wait [pid...] /bin/jsh /bin/ksh /usr/xpg4/bin/sh wait [pid...] wait [ % jobid...] /bin/csh wait DESCRIPTION
The shell itself executes wait, without creating a new process. If you get the error message cannot fork,too many processes, try using the wait command to clean up your background processes. If this doesn't help, the system process table is probably full or you have too many active foreground processes. There is a limit to the number of process IDs associated with your login, and to the number the system can keep track of. Not all the processes of a pipeline with three or more stages are children of the shell, and thus cannot be waited for. /bin/sh, /bin/jsh Wait for your background process whose process ID is pid and report its termination status. If pid is omitted, all your shell's currently active background processes are waited for and the return code will be 0. The wait utility accepts a job identifier, when Job Control is enabled (jsh), and the argument, jobid, is preceded by a percent sign (%). If pid is not an active process ID, the wait utility will return immediately and the return code will be 0. csh Wait for your background processes. ksh When an asynchronous list is started by the shell, the process ID of the last command in each element of the asynchronous list becomes known in the current shell execution environment. If the wait utility is invoked with no operands, it will wait until all process IDs known to the invoking shell have terminated and exit with an exit status of 0. If one or more pid or jobid operands are specified that represent known process IDs (or jobids), the wait utility will wait until all of them have terminated. If one or more pid or jobid operands are specified that represent unknown process IDs (or jobids), wait will treat them as if they were known process IDs (or jobids) that exited with exit status 127. The exit status returned by the wait utility will be the exit status of the process requested by the last pid or jobid operand. The known process IDs are applicable only for invocations of wait in the current shell execution environment. OPERANDS
The following operands are supported: One of the following: pid The unsigned decimal integer process ID of a command, for which the utility is to wait for the termination. jobid A job control job ID that identifies a background process group to be waited for. The job control job ID notation is applicable only for invocations of wait in the current shell execution environment, and only on systems supporting the job control option. USAGE
On most implementations, wait is a shell built-in. If it is called in a subshell or separate utility execution environment, such as one of the following, (wait) nohup wait ... find . -exec wait ... ; it will return immediately because there will be no known process IDs to wait for in those environments. EXAMPLES
Example 1: Using A Script To Identify The Termination Signal Although the exact value used when a process is terminated by a signal is unspecified, if it is known that a signal terminated a process, a script can still reliably figure out which signal is using kill, as shown by the following (/bin/ksh and /usr/xpg4/bin/sh): sleep 1000& pid=$! kill -kill $pid wait $pid echo $pid was terminated by a SIG$(kill -l $(($?-128))) signal. Example 2: Returning The Exit Status Of A Process If the following sequence of commands is run in less than 31 seconds (/bin/ksh and /usr/xpg4/bin/sh): sleep 257 | sleep 31 & jobs -l %% then either of the following commands will return the exit status of the second sleep in the pipeline: wait <pid of sleep 31> wait %% ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of wait: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, and NLSPATH. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), jobs(1), ksh(1), sh(1), attributes(5), environ(5), standards(5) SunOS 5.10 12 Dec 1997 wait(1)