sort – Page 2 – Pario TechnoBlob

Scripting

Finding the 50 largest directories

du -S / | sort -nr | head -n50

Linux

Shell script for removing duplicate files

The following shell script finds duplicate (2 or more identical) files and outputs a new shell script containing commented-out rm statements for deleting them. You then have to edit the file to select which files to keep – the script can’t safely do it automatically! OUTF=rem-duplicates.sh; echo “#! /bin/sh” > $OUTF; find “$@” -type f […]

Security

Monitoring /var/log/secure for break-in attempts

date >> ssh-intruders.log ; cat /var/log/secure | grep -i “sshd.*authentication failure” | sort | awk ‘{FS=”rhost=”; print $2}’ | awk ‘{FS=”user=”; print $1}’ | grep “.*\..*\.” | grep -v “knownhost.com” | grep -v “knownhost2.com” | sort | uniq | while read i; do counter=`grep -i “$i” /var/log/secure | wc -l` ; echo “$counter attempts by […]

Linux

Liste opp alle prosesser som kjører på systemet, uten duplikater

# ps ahx –format=%c | sort -u

Linux

Find duplicate usernames in /etc/passwd

# cat /etc/passwd | awk -F: ‘{print $1}’ | sort | uniq -c | grep -v 1 # cat /etc/shadow | awk -F: ‘{print $1}’ | sort | uniq -c | grep -v 1 # awk -F: ‘{ print $1, $5}’ /etc/passwd