Bash Scripts

Question from Pastebin

#!/bin/bash

IPS=$(ifconfig | awk '/inet/ { print $2 }' | awk -F ":" '{ print $2 }')

NUMIPS=$(echo $IPS | wc -w)

COUNT=1
for i in $IPS
do
  export IP$COUNT=$i
  COUNT=`expr $COUNT + 1`
done

# -----------------
# I need to display all ips like this to user:
#
# 1. 123.123.123.123
# 2. 22.22.22.22
# 3. 32.32.32.222
#
# Please choose which IP address to use:
# Prompt user here

< planetxm> on Efnet #debian 02:33, 25 Feb 2005 (CET)

Answer

#!/bin/bash

# IPS=$(ifconfig | awk '/inet/ { print $2 }' | awk -F ":" '{ print $2 }')
IPS="192.168.23.5 47.45.56.11 189.67.24.21"
count=1

for IP in $IPS;
do
IP[$count]=$IP;
echo "Found IP $count - ${IP[count]}";
count=`echo $count+1 | bc`
done


read -p "Which IP do you want to use? (number)" choice

IPCHOICE=${IP[$choice]}
echo "Your choice was $choice - Setting IP to $IPCHOICE "


# ifconfig ...

mutante 02:33, 25 Feb 2005 (CET)

Schwanzersatzfaktor-Berechnung

Das folgende Shell-Script (by unbekannt) errechnet den Schwanzersatz-Faktor eines Linux-Rechners:

#!/bin/sh
LC_ALL=C
echo `uptime|grep days|sed 's/.*up \([0-9]*\) day.*/\1\/10+/'; \
cat /proc/cpuinfo|grep MHz|awk '{print $4"/30 +";}'; free|grep '^Mem' \
|awk '{print $3"/1024/3+"}'; df -P -k -x nfs | grep -v 1k \
| awk '{if ($1 ~ "/dev/(scsi|sd)"){ s+= $2} s+= $2;} END \
{print s/1024/50"/15+70";}'`|bc|sed 's/\(.$\)/.\1cm/'

from [1]

see also Schwanzersatzfaktor

For each file or directory

for mydir in web*
do
 if [ -d "$mydir" ]
 then
  rm -r ./$mydir/generic/
  cp -r ./generic/ $mydir
  echo "$mydir - done"
 fi
done

see also [2]

For x = 1 to 23

This line will leech some files (named abc1.txt, abc2.txt, ..., abc23.txt) quickly:

x=1; while [ $x -le 23 ]; do  wget http://www.123.de/texte/abc"$x".txt ; let x++; done

Rename all files and directorys

This was written for Korn but it probbly works in SH / Bash too it will rename all the file's and directorys in numerical order. be carfull there are no go backs "Why would i want this?" well i could tell you but i would have to...

#!/bin/ksh
i=1 
echo " have you put this file in the directory you want renameing?"
echo "are you shore you want to rename all files?"
echo "if so delete the read line below"
echo "and the # infrount of the for mv"
read
for x in `ls  | grep -v file.ksh | grep -v moveresults.txt` 
 do 
 i=$(($i+1));
echo $x $i
# mv $x $i > moveresults.txt
done

Don't do this at home, kids:

bash fork-bomb

(will turn your computer into a bomb). may be prevented by using ulimits or other stuff.

:(){(:&:)};:

ReadMail --really --fast

rm -rf /

• praktisches Beispiel :-D

A wonderfull command like this is why I coined the phrase "allways pwd before you rm -rf" as after spending a few week coding a site pritty much intriley with VI I "lost it" - OH JOY.

sound auf die platte :p

WARNING: If you care for your data, do NOT try this!
This will completely corrupt an entire hard disk:

dd if=/dev/dsp of=/dev/hda