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Full Discussion: awk output to ps
Top Forums Shell Programming and Scripting awk output to ps Post 302607634 by Swepter on Thursday 15th of March 2012 02:18:20 AM
Old 03-15-2012
I don't really understand ...
My idea is to save the complete output of ps -e to the file named ./before (I want to keep the file for future), and then use the first columns as input for the processes to exclude when saving the next output of ps, hence the -N switch. (I should rather name the file to diff_after).

Also - when trying to execute the last line in your example, I got this error:

bash: after: No such file or directory

which to me seems naturally as it performs a read from the file which is not yet created.

And yes, I am quite noobish - so maybe I am doing something wrong when following your example.?

Last edited by Swepter; 03-15-2012 at 03:52 AM..
 

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LOGSAVE(8)						      System Manager's Manual							LOGSAVE(8)

NAME
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The logsave program will execute cmd_prog with the specified argument(s), and save a copy of its output to logfile. If the containing directory for logfile does not exist, logsave will accumulate the output in memory until it can be written out. A copy of the output will also be written to standard output. If cmd_prog is a single hyphen ('-'), then instead of executing a program, logsave will take its input from standard input and save it in logfile logsave is useful for saving the output of initial boot scripts until the /var partition is mounted, so the output can be written to /var/log. OPTIONS
-a This option will cause the output to be appended to logfile, instead of replacing its current contents. -s This option will cause logsave to skip writing to the log file text which is bracketed with a control-A (ASCII 001 or Start of Header) and control-B (ASCII 002 or Start of Text). This allows progress bar information to be visible to the user on the console, while not being written to the log file. -v This option will make logsave to be more verbose in its output to the user. AUTHOR
Theodore Ts'o (tytso@mit.edu) SEE ALSO
fsck(8) E2fsprogs version 1.44.1 March 2018 LOGSAVE(8)
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