Posts tagged grep

use strace to snoop on ssh sessions

posted on 2016-09-12 00:17

To snoop on another running SSH session, these oneliners come in handy.

  1. use w to find out which session you want to have a look at
  2. ps aux|grep pts to find out the PID
  3. replace the PID in the scripts below

CentOS

Tested on 6.8:

strace -p PID -e trace=write 2>&1 | grep --line-buffered -o '".*[^"]"' | sed -e 's/^"//' -e 's/"$//'

Debian

Tested on jessie / 8:

strace -p PID -e write 2>&1 | grep --line-buffered -e '^write(7' | grep --line-buffered -o '".*[^"]"' | sed -e 's/^"//' -e 's/"$//'

GREP: find ip address

posted on 2015-04-07 14:35:34

When having to have a look at all IPv4 adresses in a logfile, try this:

egrep '[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}' <filename>

grep: extract different IP addresses from log

posted on 2014-12-03 14:22:16

To easily grep different IP addresses out of a given log file, pipe its contents to this:

| grep -oE '([0-9]{1,3}[\.]){3}[0-9]{1,3}' | sort | uniq

Or, if you want counts of the IP's, too, how often these were found, try using uniq -c:

| grep -oE '([0-9]{1,3}[\.]){3}[0-9]{1,3}' | sort | uniq -c

In example:

cat /var/log/messages | grep -oE '([0-9]{1,3}[\.]){3}[0-9]{1,3}' | sort | uniq -c

I will not show output here, because I am not in the mood to create a test file which contains no actually used IP's.

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