On 08/09/2017 05:47 PM, bruce wrote: eval "$xx" or: echo $(eval "$xx") In the invocation you're trying to use, "|" is being passed as an argument to pgrep, rather than creating a pipe between commands/processes.

On 08/09/2017 05:47 PM, bruce wrote: It's kind of silly to pass that through "wc". Just use the "-c" option to pgrep: [root@prophead ~]# ps ax | grep bash | grep -v grep | wc -l 28 [root@prophead ~]# pgrep -f bash | wc -l 28 [root@prophead ~]# pgrep -c -f bash 28 I think PHP actually tacks on a blank line when executing the stuff in a backtick, so the "wc" value will always be 1 greater than the normal return. That's just a guess from doing a var_dump() on the output of the command: [root@prophead ~]# php -a Interactive shell php > var_dump(`pgrep -f bash | wc -l`); string(3) "29 " php > exit [root@prophead ~]# -- ---------------------------------------------------------------------- - Rick Stevens, Systems Engineer, AllDigital ricks(a)alldigital.com - - AIM/Skype: therps2 ICQ: 226437340 Yahoo: origrps2 - - - - To understand recursion, you must first understand recursion. - ----------------------------------------------------------------------

is the end result meant to be able to pass some string ($1) to pgrep that get's counted? knowing what you're trying to accomplish would make it easier to help. --- Regards, Kevin Martin On Wed, Aug 9, 2017 at 8:24 PM, bruce <badouglas(a)gmail.com&gt; wrote:

hey guys... appears to be user error... looks like i was on the wrong/older box.. on the updated centos/fed.. looks as i expected... at least for now! thanks.. On Wed, Aug 9, 2017 at 10:07 PM, bruce <badouglas(a)gmail.com&gt; wrote: > On Wed, Aug 9, 2017 at 9:52 PM, kevin martin <ktmdms(a)gmail.com&gt; wrote: >> is the end result meant to be able to pass some string ($1) to pgrep that >> get's counted? knowing what you're trying to accomplish would make it >> easier to help. >> >> --- >> > > ------------- > > hey kevin. sorry. > > the test was to (1) replicate the results I get from the cmdline. > and to then (2) be able to pass a input/var to then generate the pgrep > count results > > the initial cmdline pgrep -- pgrep -f 'bash' | wc -l > -- on the test box, this returns a "50" count > > in testing using php/bash -- i get a "51" > > #!/bin/bash -f > # > # ptest.sh > # > > pgrep -f 'bash' | wc -l > > ------------------------------------ > > on the test centos box, there is no pgrep -c << option.. haven't > checked the fedora yet > > > however, if i replace "bash" with a procname that doesn't exist.. it > correctly returns "0".. > > So, I was/am trying to wrap my head around what's going on. > > thanks > > >> >> Regards, >> >> Kevin Martin >> >> On Wed, Aug 9, 2017 at 8:24 PM, bruce <badouglas(a)gmail.com&gt; wrote: >>> >>> hmmmm update.. >>> >>> this works... >>> aa='bash' >>> echo $aa " pp" >>> xx= pgrep -f $aa | wc -l >>> echo $xx >>> >>> however, I can't seem to figure out how to enclose the aa var in >>> single quotes within the pgrep. >>> >>> thoughts/comments.. >>> >>> thanks >>> >>> >>> >>> >>> On Wed, Aug 9, 2017 at 8:47 PM, bruce <badouglas(a)gmail.com&gt; wrote: >>> > trying to get the following to output >>> > pgrep -f 'bash' | wc -l >>> > >>> > the var $xx has the cmd... >>> > something's missing to allow the backtics to run the cmd.. >>> > if the cmd is hadcoded.run, it works.. >>> > >>> > can't see what the homer simpson "doh" moment is! >>> > >>> > thanks >>> > >>> > >>> > >>> > #!/bin/bash >>> > # >>> > # ptest.sh >>> > # >>> > # use predefined variables to access passed arguments >>> > # >>> > # $1 >>> > aa=$1 >>> > aa='bash' >>> > echo $aa " pp" >>> > xx="pgrep -f '"${aa}"' | wc -l" >>> > echo $xx <<< this dsplays the test pgrep >>> > echo `$xx` << err msg >>> > echo `${xx}` << err msg... >>> > >>> > ## trying to get -- pgrep -f 'bash' | wc -l << >>> > ## i'm getting a Usage: pgrep [....] err msg.. >>> _______________________________________________ >>> users mailing list -- users(a)lists.fedoraproject.org >>> To unsubscribe send an email to users-leave(a)lists.fedoraproject.org >> >> >> >> _______________________________________________ >> users mailing list -- users(a)lists.fedoraproject.org >> To unsubscribe send an email to users-leave(a)lists.fedoraproject.org >>