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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LEARN ABOUT XFREE86
logsave
LOGSAVE(8) System Manager's Manual LOGSAVE(8)
NAME
logsave - save the output of a command in a logfile
SYNOPSIS
logsave [ -asv ] logfile cmd_prog [ ... ]
DESCRIPTION
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.
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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,
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-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)