alternative to the grep trick


 
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# 1  
alternative to the grep trick

Hi,

We used to use the below commands often.
Code:
ps -ef|grep [a]bc
ps -ef|grep abc|grep -v grep

Both fairly returns the same result.
For example, the process name is dynamic and we are having the process name in a variable, how we can apply the above trick.

For example "a" is the variable which contains the process name abc, then
Code:
ps -ef|grep $a|grep -v grep

This will work.
But how we can implement the other trick ,using [] in this case.
Any suggestions welcome.

Thanks.
# 2  
One way to do this:

Code:
a="abc"
a=`echo $a | sed "s/^\(.\)/[\1]/"`
ps -ef | grep $a

This User Gave Thanks to balajesuri For This Post:
# 3  
Thanks!It's awesome!
Code:
$ export a=sched
$  ps -ef|grep `echo $a | sed "s/^\(.\)/[\1]/"`
    root     0     0  0   Oct 23 ?        0:26 sched

# 4  
But, is this really necessary? Wouldn't it rather be easier to just type ps -ef | grep $a | grep -v grep?
# 5  
Quote:
Originally Posted by balajesuri
But, is this really necessary? Wouldn't it rather be easier to just type ps -ef | grep $a | grep -v grep?
Yes.But just for a learning.
Nothing wrong in learning i feel.

Thanks
# 6  
Definitely not :-) Cheers
# 7  
As you say, learning is great, so why don't you just look at the ps man page? You're wasting your time with grep.

Code:
ps -fC sched

This User Gave Thanks to ryran For This Post:
 

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