SEO

Using an awk program, I am trying to set the values of pid and pseudo in a
shell script to be used in other commands. So far I have:
:
logname=digna
pid=
pseudo=
ps -ef | grep xcrt | awk -v user=$logname -v pid=$pid -v pseudo=$pseudo '
( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { print $1,$2 }
( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { pid = $2 }
( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { pseudo = $6 }
'
echo $pid
echo $pseudo
exit

This program executes fine. It just doesn't set pid & pseudo.
Could some kind soul show mercy and explain the error?????

TIA
Ron

> Using an awk program, I am trying to set the values of pid and pseudo in
> a
> shell script to be used in other commands. So far I have:
> :
> logname=digna
> pid=
> pseudo=
> ps -ef | grep xcrt | awk -v user=$logname -v pid=$pid -v pseudo=$pseudo '
> ( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { print $1,$2 }
> ( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { pid = $2 }
> ( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { pseudo = $6 }
> '
> echo $pid
> echo $pseudo
> exit
>
> This program executes fine. It just doesn't set pid & pseudo.
> Could some kind soul show mercy and explain the error?????

So you want the environment variables 'pid' and 'pseudo' after ther fact?
you can't do that.

You either use ``'s to fill them, or you do everything from within awk.

Example:

#!/usr/bin/awk -f
BEGIN {
cmd = "/bin/ps -fU " ENVIRON["logname"]
while ( cmd | getline ) {
if ( $8 ~ /xcrt$/ ) {
pid = $2
pseudo = $6
system( "<do command here>" )
}
}
close( cmd )
}

If you just want to populate environment variables in a shell for
lots-of-other-purposes, then you'd have to use it completely differently:

:
pid=`ps -fU $logname | awk '$8 ~ /xcrt$/ { print $2 }'`
pseudo=`ps -fU $logname | awk '$8 ~ /xcrt$/ { print $6 }'`

However, if there are multiple PID's for this one, it will only grab the
'last' PID/TTY pair.

Hope this helps.

"Ronald J Marchand" <ron@rojomar.com> wrote in message
news:837cf$413f9652$42a6716f$20133@msgid.meganewss ervers.com...
| Using an awk program, I am trying to set the values of pid and pseudo in a
| shell script to be used in other commands. So far I have:

Look at the shell manual for the purpose of a single period on a command
line followed by a space followed by a command. Look also at the purpose of
the back quotes.

NM

Ronald J Marchand typed (on Wed, Sep 08, 2004 at 06:32:24PM -0500):
| Using an awk program, I am trying to set the values of pid and pseudo in a
| shell script to be used in other commands. So far I have:
| :
| logname=digna
| pid=
| pseudo=
| ps -ef | grep xcrt | awk -v user=$logname -v pid=$pid -v pseudo=$pseudo '
| ( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { print $1,$2 }
| ( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { pid = $2 }
| ( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { pseudo = $6 }
| '
| echo $pid
| echo $pseudo
| exit
|
| This program executes fine. It just doesn't set pid & pseudo.
| Could some kind soul show mercy and explain the error?????

A parent does not inherit from its child. Whatever you set inside the
awk program is unknown outside it.

Your grep is superfluous, BTW.

Try this:

eval `ps -ef | awk -v user=$LOGNAME '
$1~user && $8~"/usr/lib/merge/xcrt" {print "pid=" $2 " pseudo=" $6}
'`
echo PID is $pid and PSEUDO-TTY is $pseudo

--
JP

"Stuart J. Browne" <stuart@promed.com.au> wrote in message
news:413f9da9@dnews.tpgi.com.au...
> > Using an awk program, I am trying to set the values of pid and pseudo in
> > a
> > shell script to be used in other commands. So far I have:
> > :
> > logname=digna
> > pid=
> > pseudo=
> > ps -ef | grep xcrt | awk -v user=$logname -v pid=$pid -v pseudo=$pseudo
'
> > ( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { print $1,$2 }
> > ( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { pid = $2 }
> > ( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { pseudo = $6 }
> > '
> > echo $pid
> > echo $pseudo
> > exit
> >
> > This program executes fine. It just doesn't set pid & pseudo.
> > Could some kind soul show mercy and explain the error?????
>
> So you want the environment variables 'pid' and 'pseudo' after ther fact?
> you can't do that.
>
> You either use ``'s to fill them, or you do everything from within awk.
>
> Example:
>
> #!/usr/bin/awk -f
> BEGIN {
> cmd = "/bin/ps -fU " ENVIRON["logname"]
> while ( cmd | getline ) {
> if ( $8 ~ /xcrt$/ ) {
> pid = $2
> pseudo = $6
> system( "<do command here>" )

This I will explore. thanks

> }
> }
> close( cmd )
> }
>
> If you just want to populate environment variables in a shell for
> lots-of-other-purposes, then you'd have to use it completely differently:
>
> :
> pid=`ps -fU $logname | awk '$8 ~ /xcrt$/ { print $2 }'`
> pseudo=`ps -fU $logname | awk '$8 ~ /xcrt$/ { print $6 }'`
>
> However, if there are multiple PID's for this one, it will only grab the
> 'last' PID/TTY pair.

I am aware of how to use accent grave to set a variable in the caller. While
this little project has a purpose, it is also a learning project on the use
of awk. I just hoped that if you could pass one piece of information back
to the caller, there could be a way to pass multiple variables. Apparently
not. It seems inefficient to run the same (similar) script several times.

Thanks
Ron

"Jean-Pierre Radley" <jpr@jpr.com> wrote in message
news:20040909002807.GB22610@jpradley.jpr.com...
> Ronald J Marchand typed (on Wed, Sep 08, 2004 at 06:32:24PM -0500):
> | Using an awk program, I am trying to set the values of pid and pseudo in
a
> | shell script to be used in other commands. So far I have:
> | :
> | logname=digna
> | pid=
> | pseudo=
> | ps -ef | grep xcrt | awk -v user=$logname -v pid=$pid -v pseudo=$pseudo
'
> | ( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { print $1,$2 }
> | ( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { pid = $2 }
> | ( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { pseudo = $6 }
> | '
> | echo $pid
> | echo $pseudo
> | exit
> |
> | This program executes fine. It just doesn't set pid & pseudo.
> | Could some kind soul show mercy and explain the error?????
>
> A parent does not inherit from its child. Whatever you set inside the
> awk program is unknown outside it.
>
> Your grep is superfluous, BTW.

You are in fact correct. I started building from what I used on the command
line.

>
> Try this:
>
> eval `ps -ef | awk -v user=$LOGNAME '
> $1~user && $8~"/usr/lib/merge/xcrt" {print "pid=" $2 " pseudo=" $6}
> '`
> echo PID is $pid and PSEUDO-TTY is $pseudo

In this case I am writing a script to do a job which requires 2 variables.
I can execute the awk program twice with accent grave to set the variables.
But what if you wanted 6? Apparently you can direct the output to a file
( I have never done it ... yet). I was hoping there was a way to redirect
this back into the script without using a file.

Thanks
Ron

On Thu, Sep 09, 2004 at 07:54:42AM -0500, Ronald J Marchand wrote:
| "Stuart J. Browne" <stuart@promed.com.au> wrote in message
| news:413f9da9@dnews.tpgi.com.au...
| > > Using an awk program, I am trying to set the values of pid and pseudo in
| > > a
| > > shell script to be used in other commands. So far I have:
| > > :
| > > logname=digna
| > > pid=
| > > pseudo=
| > > ps -ef | grep xcrt | awk -v user=$logname -v pid=$pid -v pseudo=$pseudo
| '
| > > ( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { print $1,$2 }
| > > ( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { pid = $2 }
| > > ( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { pseudo = $6 }
| > > '
| > > echo $pid
| > > echo $pseudo
| > > exit
| > >
| > > This program executes fine. It just doesn't set pid & pseudo.
| > > Could some kind soul show mercy and explain the error?????
| >
| > So you want the environment variables 'pid' and 'pseudo' after ther fact?
| > you can't do that.
| >
| > You either use ``'s to fill them, or you do everything from within awk.
| >
| > Example:
| >
| > #!/usr/bin/awk -f
| > BEGIN {
| > cmd = "/bin/ps -fU " ENVIRON["logname"]
| > while ( cmd | getline ) {
| > if ( $8 ~ /xcrt$/ ) {
| > pid = $2
| > pseudo = $6
| > system( "<do command here>" )
|
| This I will explore. thanks
|
| > }
| > }
| > close( cmd )
| > }
| >
| > If you just want to populate environment variables in a shell for
| > lots-of-other-purposes, then you'd have to use it completely differently:
| >
| > :
| > pid=`ps -fU $logname | awk '$8 ~ /xcrt$/ { print $2 }'`
| > pseudo=`ps -fU $logname | awk '$8 ~ /xcrt$/ { print $6 }'`
| >
| > However, if there are multiple PID's for this one, it will only grab the
| > 'last' PID/TTY pair.
| >
| I am aware of how to use accent grave to set a variable in the caller. While
| this little project has a purpose, it is also a learning project on the use
| of awk. I just hoped that if you could pass one piece of information back
| to the caller, there could be a way to pass multiple variables. Apparently
| not. It seems inefficient to run the same (similar) script several times.

Sure there is, by using "eval" and command substitution:

eval `
awk '{
# your awk program to determine the values
# you want to assign to var1, var2, var3 ...
}
END {
print "var1=" var1
print "var2=" var2
print "var3=" var3
}' filename # or piped in standard input
`

Bob

--
Bob Stockler - bob@trebor.iglou.com
Author: MENU EDIT II - The BEST Creator/Editor/Manager for filePro User Menus.
Fully functional (time-limited) demos available by email request (specify OS).

"Bob Stockler" <bob@trebor.iglou.com> wrote in message
news:20040909155625.GA2244@trebor.iglou.com...
> On Thu, Sep 09, 2004 at 07:54:42AM -0500, Ronald J Marchand wrote:
> | "Stuart J. Browne" <stuart@promed.com.au> wrote in message
> | news:413f9da9@dnews.tpgi.com.au...
> | > > Using an awk program, I am trying to set the values of pid and
pseudo in
> | > > a
> | > > shell script to be used in other commands. So far I have:
> | > > :
> | > > logname=digna
> | > > pid=
> | > > pseudo=
> | > > ps -ef | grep xcrt | awk -v user=$logname -v pid=$pid -v
pseudo=$pseudo
> | '
> | > > ( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { print $1,$2 }
> | > > ( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { pid = $2 }
> | > > ( $1 == user && $8 == "/usr/lib/merge/xcrt" ) { pseudo = $6 }
> | > > '
> | > > echo $pid
> | > > echo $pseudo
> | > > exit
> | > >
> | > > This program executes fine. It just doesn't set pid & pseudo.
> | > > Could some kind soul show mercy and explain the error?????
> | >
> | > So you want the environment variables 'pid' and 'pseudo' after ther
fact?
> | > you can't do that.
> | >
> | > You either use ``'s to fill them, or you do everything from within
awk.
> | >
> | > Example:
> | >
> | > #!/usr/bin/awk -f
> | > BEGIN {
> | > cmd = "/bin/ps -fU " ENVIRON["logname"]
> | > while ( cmd | getline ) {
> | > if ( $8 ~ /xcrt$/ ) {
> | > pid = $2
> | > pseudo = $6
> | > system( "<do command here>" )
> |
> | This I will explore. thanks
> |
> | > }
> | > }
> | > close( cmd )
> | > }
> | >
> | > If you just want to populate environment variables in a shell for
> | > lots-of-other-purposes, then you'd have to use it completely
differently:
> | >
> | > :
> | > pid=`ps -fU $logname | awk '$8 ~ /xcrt$/ { print $2 }'`
> | > pseudo=`ps -fU $logname | awk '$8 ~ /xcrt$/ { print $6 }'`
> | >
> | > However, if there are multiple PID's for this one, it will only grab
the
> | > 'last' PID/TTY pair.
> | >
> | I am aware of how to use accent grave to set a variable in the caller.
While
> | this little project has a purpose, it is also a learning project on the
use
> | of awk. I just hoped that if you could pass one piece of information
back
> | to the caller, there could be a way to pass multiple variables.
Apparently
> | not. It seems inefficient to run the same (similar) script several
times.
>
> Sure there is, by using "eval" and command substitution:
>
> eval `
> awk '{
> # your awk program to determine the values
> # you want to assign to var1, var2, var3 ...
> }
> END {
> print "var1=" var1
> print "var2=" var2
> print "var3=" var3
> }' filename # or piped in standard input
> `
>
> Bob
>
Thanks. JP indicated this but I didn't understand what he meant

Ron