When I am writing my own interpreter... Post: 302141125

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Top Forums Programming When I am writing my own interpreter... Post 302141125 by blowtorch on Wednesday 17th of October 2007 10:01:41 PM

10-17-2007

Registered User

First of all, all the commands you specified are processes. nano will be one process, vi will be another. "ls | grep xyz" will create two processes, one for the ls and the second for the grep. A job is what the interpreter (the shell) handles internally. A job may consist of one or more processes. It is basically a one or more processes that the shell treats as a single unit when, say, handling signals.

As for your second question, shouldn't you ask your college instructor for help with your homework? But overall, you are on the right track. Choose your seperators well. White space (spaces and tabs) can come in the course of a single command. But a | or a newline (\n) are definitely command seperators. Treat them as such.

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LEARN ABOUT XFREE86

killall5

KILLALL5(8)						Linux System Administrator's Manual					       KILLALL5(8)

NAME

       killall5 -- send a signal to all processes.

SYNOPSIS

       killall5 -signalnumber [-o omitpid[,omitpid..]]	[-o omitpid[,omitpid..]..]

DESCRIPTION

       killall5  is the SystemV killall command. It sends a signal to all processes except kernel threads and the processes in its own session, so
       it won't kill the shell that is running the script it was called from. Its primary (only) use is in the rc scripts found in the /etc/init.d
       directory.

OPTIONS

       -o omitpid
	      Tells killall5 to omit processes with that process id.

NOTES

       killall5 can also be invoked as pidof, which is simply a (symbolic) link to the killall5 program.

EXIT STATUS

       The  program  return  zero  if  it  killed  processes.  It return 2 if no process were killed, and 1 if it was unable to find any processes
       (/proc/ is missing).

SEE ALSO

       halt(8), reboot(8), pidof(8)

AUTHOR

       Miquel van Smoorenburg, miquels@cistron.nl

								    04 Nov 2003 						       KILLALL5(8)