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How to find the corresponding command for a existing PID?

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Top Forums Shell Programming and Scripting How to find the corresponding command for a existing PID?
# 1  
Old 06-17-2015
How to find the corresponding command for a existing PID?
Hi All,

A process completed already and I have the PID. I want to know the which command used for this PID. 'ps' command and '/proc' folder having the list current process only. Is there a way to search completed process PID?

Thanks,
Manimuthu
# 2  
Old 06-17-2015
PIDs get recycled, they point to an entry in the process table rather than a specific event.

How did you get the PID of the completed process?
# 3  
Old 06-17-2015
I have a core file and i am trying to analyze with GDB.

I got the below output and want to know about which command used for the PID's

(gdb) core /opt/lampp/var/mysql/core.mysqld.9765
BFD: Warning: /opt/lampp/var/mysql/core.mysqld.9765 is truncated: expected core file size >= 5137190912, found: 104931328.
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Core was generated by `./mysqld'.
Program terminated with signal 11, Segmentation fault.
#0 0x00000031fac07638 in ?? ()
(gdb)
# 4  
Old 06-17-2015
The process must be running in order to know the process/command name through PID (process ID). If a process completes then the respective /proc/<PID> directory will be removed.

Code:
# ps -elf | grep vmstat
0 S root      1724  1705  0  80   0 -  1530 hrtime 10:54 pts/1    00:00:00 vmstat 10
0 S root      1727  1602  0  80   0 - 25810 pipe_w 10:54 pts/0    00:00:00 grep vmstat
# cat /proc/1724/cmdline
vmstat10
# ps -elf | grep vmstat
0 S root      1730  1602  0  80   0 - 25810 pipe_w 10:55 pts/0    00:00:00 grep vmstat
# cat /proc/1724/cmdline
cat: /proc/1724/cmdline: No such file or directory
#

If you can re-create your problem, you can have "ps -elf" command running in a loop to capture the command or process name.
# 5  
Old 06-17-2015
Thanks, I am using redhat linux and i know when the 'core' file was created. Is there any way to check to generic log file, then pls let me know the path.
# 6  
Old 06-17-2015
Not that I am aware of. Please wait for others to respond.
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