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Shell Programming and Scripting

PID length

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# 1  
Old 12-20-2007
PID length
Does somebody know how many characters can have a PID as maximum?

I'm trying to get the PID of another process running in the same machine. I'm doing this:

Code:
ps -ef | grep "bin/Alime" | grep -v grep  | cut -c10-16

but I don't know if I 'll have enough with six chars. Which is the max value that it can take?

thanks in advance
# 2  
Old 12-20-2007
that depends on the maximum number allowed for a PID and it varies from system to system
# 3  
Old 12-20-2007
I'm looking for a PIDMAX or something like this, but I can't find anything. This is my system:
Code:
ASASTR:include> uname -a
OSF1 CLHASASTR V5.1 2650 alpha

Thanks again
# 4  
Old 12-20-2007
cannot you just get the whole column instead of relying on character ranges?
something like:
Code:
ps -ef | grep '[b]in/Alime' | cut -d ' ' -f1

# 5  
Old 12-20-2007
yes, the whole column would be great. I have tried to get only the second column

Code:
 ps -ef | grep "bin/Alime" | grep -v grep  | cut -f 2

but it shows the whole line again. I don't know why, maybe the command is not correct.

thanks
# 6  
Old 12-20-2007
Code:
ps -ef | grep '[b]in/Alime' | cut -d ' ' -f 2

cut's field delimiter is 'tab' by default......
# 7  
Old 12-20-2007
these are my outputs:

Code:
ASASTR:clh> ps -ef | grep "bin/Alime" | grep -v grep
clh      221867 217065  0.0 11:34:01 pts/4        0:00.08 /usr/local/clh/ALPHA/oasys/bin/AlimentaLookAhead

ASASTR:clh> ps -ef | grep "bin/Alime" | grep -v grep  | cut -c10-16
221867

ASASTR:clh> ps -ef | grep "bin/Alime" | grep -v grep  | cut -d ' ' -f1
clh

ASASTR:clh>  ps -ef | grep "bin/Alime" | grep -v grep  | cut -d ' ' -f2

ASASTR:clh>  ps -ef | grep "bin/Alime" | grep -v grep  | cut -f2
clh      221867 217065  0.0 11:34:01 pts/4        0:00.08 /usr/local/clh/ALPHA/oasys/bin/AlimentaLookAhead

asking for the first column (-f1) i get the username, but asking for the second (-f2) i get the whole line.
Thanks.
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