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If the filename is as specified above, then
pid=`cat /tmp/script.PID` Then use $pid to access the PID. E.g., to kill the process, do kill $pid

But if your system's ps command supports formatted...

That's right. One of the differences between C-shells and Bourne-shells is that in Bourne derived shells, if you start quoted text while entering a command (i.e., with a ' or "), a newline does not...

Not probably -- certainly.

Here is a pretty good thread if you are interestsed in he syntax of here documents and how the shell treats things in a here doc: https://www.unix.com/showthread.php?p=80897#post80897

However, I...

What may be your problem is that you are redirecting your output to $ctrl, but have not defined the ctrl varaible at all prior to this. Maybe you should edit all the redirection statments to have...

try this. much simpler and to the point: ps -eo comm,pid | awk '$1 == "keepalive" { print $2 }'

Does anyone know which came first for the test syntax: test <expr> or [ <expr> ]? My vague understanding is that test was the initial way to do it. But if so, when was the [ syntax introdcued?...

...and by the way, if you do want to set a variable with a value from a subprocess, check out the thread at https://www.unix.com/showthread.php?t=20755

VAR=${VAR:=default_value}

if VAR is already set (and not null), will be reset with its own value; else will be set to "default_value". In your case, you can put 0 for this value.
Another less...

If you want to do only a couple things with the output, filter you source file in a pipeline: grep -v '^[[:space:]]*#' /path/to/your/file | your_commands if you want do extensive stuff with your...

Though maybe not so pertinent to your particular problem at hand, but I think the basic principle you need to grasp here is that of command subsitution, implemented in the Bourne shell with backtics,...

exactly...

the same for

comm <<$VAR_NAME
a
b
$VAR_NAME

You can't end the here doc with the value of this supopsed variable -- it just a label, '$VAR_NAME'

For every Bourne-derived shell I know of, concerning the redirection constructs, >, <, >>, and <<, the name supplied after the redirection operator undergoes variable/command/arithmetic/filename...

Well, generally speaking, if you want to run as a command as another user, you don't use su, but sudo. Read it's man page--pretty easy to use. But you will be prompted for the user's password...

does your script have any "read" statements? is there any reason why the script's stdin or stdout would need to be connected to a terminal?

This is pretty cool: The following procedure allows you to write a script that sends some "normal" output, ie, to the terminal, but other output to its calling program, so that the caller can recieve...

Dude, don't worry about it. You probably can code better than many of us here... :)
But "Bourne shell" is just a name for the orignal version of the Unix comand intrenpreter, written at AT&T Bell...

I am writing a shell script that executes another script by fetching it over the network and piping its contents into sh (ftp -o - $script | sh; or wget -O - |sh). Since this bypasses putting the...

Indeed, here is a snippet OpenBSD's code (@ http://www.openbsd.org/cgi-bin/cvsweb/src/bin/ksh/main.c):

That's not what I was after. But I did find this in OpenBSD's sh man page:


So it indeed does function like bash, insofar that OpenBSD's modified version of pdksh checks if it has been invoked as...

Hi,

I am running OpenBSD 3.7, my first attempt with this OS. I noticed that both /bin/sh and /bin/ksh are both really the pdksh. Yet each has its own manpage. I was wondering what are the...

how about:

#!/bin/sh
while read line
do
grep "$line" /path/to/file2 >> file3
done < /path/to/file1

This discussion will be seem clearer afer examining the final code offered--which is very short. But to gain some knowledge and understanding, which is always importnat...
The read command works by...

Well, if you really want to know, write up an awk script that will count the number of instances of certain keywords (such as ps, echo, sed) is a user's scripts. Then you can distribute this script...

If the modification times of the files don't necesarilly match the "dates" coded in the filenames, then you have to be a bit more creative. If this is part of a big project that you want automated,...