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Variable substitution to show up in ps and jobs.

 
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Top Forums UNIX for Dummies Questions & Answers Variable substitution to show up in ps and jobs.
# 1  
Old 07-30-2014
Variable substitution to show up in ps and jobs.
when creating a for loop (or any other parameter) then using that paramter in a background command execution I only see the parameter name, not the value.
I have tried eval and exec and a host of other options to try to get the text of the parameter showing, so i know what step is left...
e.g.
Code:
for i in dog cat fish bucket
do
    myCommand $i &
done
jobs
[1]   Running                 myCommand $i
[2]   Running                 myCommand $i
[3]-  Running                 myCommand $i
[4]+  Running                 myCommand $i

But what I want to see is:
Code:
[1]   Running                 myCommand dog
[2]   Running                 myCommand cat
[3]-  Running                 myCommand fish
[4]+  Running                 myCommand bucket

Moderator's Comments:
Mod Comment edit by bakunin: please use CODE-tags
Last edited by bakunin; 07-30-2014 at 02:40 AM..
# 2  
Old 07-30-2014
Set xtrace:-
Code:
#!/bin/ksh -x

for i in dog cat fish bucket
do
    ./myCommand $i &
done

# 3  
Old 07-30-2014
Hadn't tried ksh
jobs gives:
Code:
[4] +  Running                 <command unknown>
[3] -  Running                 <command unknown>
[2]    Running                 <command unknown>
[1]    Running                 <command unknown>

But the ps is substituted!!!!
Code:
mysql     5847  5846  0 09:53 pts/2    00:00:00 /bin/bash ./myCommand.sh dog
mysql     5848  5846  0 09:53 pts/2    00:00:00 /bin/bash ./myCommand.sh cat
mysql     5849  5846  0 09:53 pts/2    00:00:00 /bin/bash ./myCommand.sh fish
mysql     5850  5846  0 09:53 pts/2    00:00:00 /bin/bash ./myCommand.sh bucket

Ta.
# 4  
Old 07-31-2014
Most shells put the original command line (before parsing) as ARG 0.
One of the rare cases where you can try eval.
Code:
for i in dog cat fish bucket
do
  cmd="myCommand $i &"
  eval $cmd
done
jobs

 
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