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How to read from a .dat file in Unix


 
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# 1  
How to read from a .dat file in Unix

Hi All,

I have a .dat file named test.dat where I have stored some process IDs.
Now I need to pick a process ID, one by one and then fire kill -9 for each of those. The logic should be:

1. open file <filename.dat>
2. read until last line of file
3. if process ID is found fire kill -9 <process ID>


Can anyone help me out with the Unix script for this?

Please help urgently.

Thanks in advance,
Sibasish.
# 2  
Assuming filename.dat contains a single pid per line

Code:
#!/bin/ksh

while read pid
do
  while kill -0 $pid 2> /dev/null
  do
    kill -9 $pid 2> /dev/null
  done
done < filename.dat

# 3  
Can you really explain the script? I am really new to Unix and unable to understand
# 4  
Quote:
Originally Posted by vino
Assuming filename.dat contains a single pid per line

Code:
#!/bin/ksh

while read pid
do
  while kill -0 $pid 2> /dev/null
  do
    kill -9 $pid 2> /dev/null
  done
done < filename.dat

I shall explain each while loop separately.

Code:
while read pid
do
  echo $pid
done < filename.dat

Read lines from filename.dat one at a time and print them.

Code:
while kill -0 $pid 2> /dev/null
do
  kill -9 $pid 2> /dev/null
done

kill -0 $pid can be used to detect if the process denoted by the pid $pid is alive or not. If it is alive, then issue a kill -9 $pid till it dies.
# 5  
My .dat file abc.dat has only two lines

233465
234566.

Now what should I do?
# 6  
If you understood my previous post, then you will know what to do. Where are you stuck ? What is it that you have not understood ?

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