02-13-2006
suspend/restart a process in shell script
Hi,
I have a task that Im stuck on. I have an elementary script named 'myscript' that prints "the script is running" once a second. It runs for 27 seconds. I need to write a 2nd script that starts 'myscript' and takes a parameter '$1' for a number. my 2nd script then needs to pause myscript every $1 seconds for $1 seconds until myscript completes. myscript should not be 'aware' or 'listen' for anything.
I tried the wait command but it starts over instead of picking up where it left off. I looked at setting myscript as a background process, but again that doesnt seem like the solution as it wouldn't pause.
Please can someone explain what commands/approach they would use to solve my problem?
My only other thought would be to grep the process from ps as a looping condition, if it exists then put it to sleep (I dont think I can use the sleep command in this way though..?).
Thank you in advance for any help you can offer my noob self.
Best regards,
Dane Ensign
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YAPP(1) User Contributed Perl Documentation YAPP(1)
NAME
yapp - A perl frontend to the Parse::Yapp module
SYNOPSYS
yapp [options] grammar[.yp]
yapp -V
yapp -h
DESCRIPTION
yapp is a frontend to the Parse::Yapp module, which lets you compile Parse::Yapp grammar input files into Perl LALR(1) OO parser modules.
OPTIONS
Options, as of today, are all optionals :-)
-v Creates a file grammar.output describing your parser. It will show you a summary of conflicts, rules, the DFA (Deterministic Finite
Automaton) states and overall usage of the parser.
-s Create a standalone module in which the driver is included. Note that if you have more than one parser module called from a program,
to have it standalone, you need this option only for one of your parser module.
-n Disable source file line numbering embedded in your parser module. I don't know why one should need it, but it's there.
-m module
Gives your parser module the package name (or name space or module name or class name or whatever-you-call-it) of module. It defaults
to grammar
-o outfile
The compiled output file will be named outfile for your parser module. It defaults to grammar.pm or, if you specified the option -m
A::Module::Name (see below), to Name.pm.
-t filename
The -t filename option allows you to specify a file which should be used as template for generating the parser output. The default is
to use the internal template defined in Parse::Yapp::Output.pm. For how to write your own template and which substitutions are
available, have a look to the module Parse::Yapp::Output.pm : it should be obvious.
-b shebang
If you work on systems that understand so called shebangs, and your generated parser is directly an executable script, you can specifie
one with the -b option, ie:
yapp -b '/usr/local/bin/perl -w' -o myscript.pl myscript.yp
This will output a file called myscript.pl whose very first line is:
#!/usr/local/bin/perl -w
The argument is mandatory, but if you specify an empty string, the value of $Config{perlpath} will be used instead.
grammar
The input grammar file. If no suffix is given, and the file does not exists, an attempt to open the file with a suffix of .yp is tried
before exiting.
-V Display current version of Parse::Yapp and gracefully exits.
-h Display the usage screen.
BUGS
None known now :-)
AUTHOR
Francois Desarmenien <francois@fdesar.net>
COPYRIGHT
(c) Copyright 1998-1999 Francois Desarmenien, all rights reserved. See Parse::Yapp(3) for legal use and distribution rights
SEE ALSO
Parse::Yapp(3) Perl(1) yacc(1) bison(1)
perl v5.16.3 2001-02-11 YAPP(1)