General :: Function Having Background Process Inside Command Substitution

Oct 5, 2010

The first call to "somefunction" works as expected. The function prints "endfunction" and a process in background sleeps 30 seconds. In the second call I thought it should work in the same way, but the script sleeps 30 seconds before it prints "endfunction".Does someone know the reason of this behavior? Is there another way to do a command substitution of a function that has a background process without have to waiting for that process?

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General :: Command / C Function To See Cpu Number On Which Process Running?

Feb 22, 2011

When I fork multiple processes, is there some command or c function to see the cpu number on which the processes are running?

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General :: Sending Remote Command To Background Process + Out Log?

Feb 1, 2010

Because of my English skills I'll try to explain this subject as best I can, thank you for understanding. Fisrt of all, I am running some program on my slackware in background (using standard method - &). I need to make a script, which allows sending command to this process on my machine from another one. Furthermore this program have to be logged out (standard output f.e. ./myprogram > log.out.txt).It might be a separate Program A which runs my Program B but it cannot be screen, because it is not working like I'd like to and it cannot be java, because it's slow and working not the best so to speak

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General :: Determine On System Where Process Substitution Creates FIFO Files?

Aug 16, 2011

I'm writing a C++ application and need to work with process substitution in the Bash shell. I'm trying to find a way to validate the paths passed as arguments to my program, some of which point to FIFO files created by process substitution.

Is there a shell (or C++) way that I can check if the system creates these files in /dev/fd or if they are created somewhere else?

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General :: Using An Alias Inside A Function In Bash?

Jun 8, 2011

I have trouble with using an alias inside aash function. I would like to ssh into multiple machines by executing:ssh machine To achieve this, I put something like the following into my ~/.bashrc:

alias machine='user@machine'
ssh()
{

[code]....

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General :: Sed Command Does Not Perform Substitution

Jul 22, 2010

I've been trying to use a find command with -exec to find the differences between identically-named files in different paths. My initial attempt was to do something like this:
Code: find trunk/ -type f -not -path '*.svn*' -exec diff '{}' `echo '{}' | sed 's/^trunk///'` ;

Unfortunately this does not work at all as expected (the diff ends up executing on the same file)! I have narrowed it down to the subshell (inside the ``) but beyond that I have no idea. For some reason the sed, though written correctly, does not perform the substitution. I've changed the diff to echo and played with the sed command and the only way I can get it to perform _any_ substitution is to use .* as the regex. Even s/.*trunk.*/SUB/ doesn't work. Any insight into the inner workings of -exec/subshells/pipes or some crap I'm missing? Don't worry about rewriting the command to make it work; I simply swapped the paths and got rid of the subshell nonsense and everything works fine.

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General :: Shifting Positional Parameter Inside A Function?

Oct 19, 2010

I need to shift the positional parameters of a script inside a function, but any call to "shift 1" inside a function shifts only the parameters of that function. Is there some way of accomplishing that? I tried another approach using an alias. The problem is that I have to take the result of the alias. So I call in my script:

Code:

var=$(shiftalias)

At first time, it works correctly, but after that it does not shift the parameters anymore.

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General :: Scripting - Try To Passing Arguments To For Cycle - Inside A Function

Apr 26, 2011

The code:

Quote:

Problem: I need a method to maintain the $i variable. In fact, actually, this variable get lost when executed. I think that an escape can preserve this variable and permit its execution inside the function, but I've no idea about.

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General :: Mkdir In Bash Script - Command Substitution

Jun 26, 2010

I was to set up a cronjob that sends its output to a logfile, i want that log file to be unique. the easiest way to set this up would be to make the directory in the script, then output the command to that directory, they call that directory via is full path in cron (because cron only uses full path names.

This does not work

keep in mind the command "/bin/mkdir -p /tmp/pw_log/`date +20%y%m%d_%H%M%S`.log" works fine on the command line - but once I put it in the shell, it does not work.

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Programming :: Bash - Why Is Process Substitution <() So Much Faster

Nov 25, 2010

file allids consists of 300,000 rows, each containing a 5-7 digit numeric id. file newids consists of 20,000 rows of id's. How do you explain the following timings? time: 0.07s:

Code:

diff <(sort allids) <(sort newids)
time: 1.6s:

[code].....

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General :: Repeatedly Getting Command Substitution - Line 3 - Syntax Error Near Unexpected Token

Aug 31, 2010

I am repeatedly getting error:

I need to pass the value of:

I am using #!/bin/bash

This command works on shell without any issue.

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Debian :: /bin/dash: Bad Substitution Shown Repeatedly Until Kill Process

Mar 16, 2011

if i run /bin/dash at the command prompt I get the message /bin/dash: Bad substitution shown repeatedly until I kill the process

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Programming :: Bash: Functional Difference Between Process Substitution And Here String With $( )

Mar 14, 2010

Further to solved LQ thread Bash: how to populate a list of arbitrarily named files?, what is the functional difference between feeding a loop with process substitution and feeding it with a here string with embedded command substitution? ABSG pages: process substitution, here string and command substitution. This works

Code:

while IFS= read -r -d '' file
do
files+=("$file")
done < <(find $dir -type f -print0)

[code]....

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General :: Run Two Background Process?

Oct 26, 2010

i have ported linux into arm and i want to run two background process on target

i have two c programs a.c and b.c
i have cross compiled them as
arm-linux-gcc -o a a.c

[code]...

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General :: Run A Process In The Background?

Nov 16, 2010

Could you tell me how can I run a process in the background?

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General :: Pull Process / Job Into Background

Jan 17, 2011

I know of terminating a command with & and then moving it into the background by pressing Ctrl-Z and then bg [pid], and I also know of nohup. But say you started a process that turned out to take much longer than one expected, is there a way of pulling, so to speak, this process from another terminal screen into the background so that even if I log off from the server the process would continue?

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General :: Nohup Does Not Run Process In Background

Apr 11, 2011

I run

nohup bash -c "while [ true ]; do echo test; done"

from PuTTy SSH client but after this process is not runned in background instead nohup keeps to be foreground process in shell.

SW version: nohup (GNU coreutils) 8.5

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General :: Moving A Process To Background Using PID?

Mar 5, 2011

i want to send a running process to background .. normal commands like sleep i can able to move easily to bg .

# sleep 10
#Ctrl+z
#bg

[code]...

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General :: Way To See Only Process Running In Background?

Feb 23, 2011

Is there some way to see only the process running in the background?

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General :: Running Process In Background

Jan 14, 2011

Is there any way to run a long process in background so that it still remain in running state even if the user logout the system.

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General :: Move Running Process To Background

Mar 10, 2011

How do you move a running process to the background? For example, type the command sleep 60 on the command line and try moving that process to the background.

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General :: Process In Background Hogs 96% CPU But When Ran In Foreground Its Almost Zero

May 17, 2010

I am trying to solve one problem: When i run my process in background it hogs around 96% of CPU. But when ran in foreground, CPU utilization is almost zero. Is there any difference b/n a background and a foreground process wrto CPU utilization?

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General :: Dhclient Retry Working - Background Process

May 30, 2011

How the dhclient retry working(Background Process).

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Programming :: How To Use A Function Inside A Shell

Apr 28, 2011

I am very new to shell script, and my requirement is --

1. open the apache access log, use "cut" and "grep" to find the numbers.
2.put the result in a file
3.then compare the same result with day before result
4. send the result via e-mail.

so how can i do that , using some functions..

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General :: Background Process Execution Hangs Console And Ip Communication?

Feb 9, 2011

I have 3 processes to be executed in a particular sequence.

ProcessA
ProcessB
ProcessC

The requirement is that all the processes should run as background processes.

ProcessA talks to ProcessB and ProcessC using sockets.
ProcessB talsk to ProcessA only using sockets.
ProcessC talsk to ProcessA only using sockets.

[Code].....

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General :: Running Program In Background In Child Emulator Process

Aug 26, 2009

I wonder how one can, if at all, run an X program in the background *in an emulator sub-shell process*. What I mean is to launch a program in an emulator, e.g, by xterm -e gedit

but with gedit (in this example) running in the background from inside the xterm sub-process, so that the xterm will accept other commands. In the above, gedit will run in the foreground, and of course, if you do
xterm -e gedit &

then xterm will run in the background, not gedit.In short, I would like to achieve the same thing as "gedit &" as you manually do in xterm, but from another shell. What I aim to do is write an X init script to achieve this result (to have the emulator open and a program or two running from it, in the background, at the X startup).

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Ubuntu :: How To Get Wireless Manager To Function Inside FVWM

Jun 29, 2010

I have a fresh desktop install ubuntu 10.04 which then I added the fvwm-crystal package (and dependencies). I logout of gnome, and into fvwm. When I do so, I lose my wireless connection that was started when I was in gnome. Is there a way to get a wireless manager to function inside fvwm (if I add it to the auto-start in my fvwm2rc?). What app can I use? I tried and failed miserably using the command line iwconifg/iwlist tools.

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General :: Run Command As Root Inside Script?

Sep 4, 2009

I am running a shell script using a non root user. Somewhere down in the script, I'll have to call some script to be executed as su (or a user with more privileges than the one running the original script). So if i put a line in the script as:

Code:

su - root -c /root/roleScripts/assignRoles.sh

Then when running the command, it will prompt me for root password(because the current user has lower privileges than the user requested. Suppose I want to pass this password as an argument to the original script, so that it doesn't prompt me for password later on, what is the way? Can I switch user passing the password and run a command?

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Programming :: Run Function In Background?

Mar 26, 2010

I wrote a spinner in Perl and when I did a spinner in shell I could just run the subroutine in the background.

[code]...

In Perl, how do you run a function in a background and get the PID for that? I know PID in Perl is $$

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Programming :: Variable Substitution In Sqlite Open Db Command?

Jun 15, 2010

I have the following TCL code:

if{ [catch {sqlite3 db /path/to/db/file} result] } {
puts stderr $result
} else {
do something
}

What I want is to use a variable for the file name/path. When I put in a variable instead of the absolute path, I get an error: "missing close-brace: possible unbalanced brace in comment while executing"

This is weird because when I run the code with the fully qualified pathname, it works fine. I substitute out the pathname for a variable containing the pathname ($variable) and I get this error.

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