Bash_examples

MAN Bash:

http://poplinux.ru/adv-bash/part-3.html

http://ln.com.ua/~openxs/projects/man/solaris8/bash.html

http://citforum.ru/programming/shell/gl3.shtml

http://tldp.org/LDP/Bash-Beginners-Guide/html/Bash-Beginners-Guide.html#sect_09_04

http://ruslandh.narod.ru/howto_ru/Bash-Prog-Intro/Bash-Prog-Intro-7.html

MAN Vi:

http://wiki.firstvds.ru/index.php/%D0%A2%D0%B5%D0%BA%D1%81%D1%82%D0%BE%D0%B2%D1%8B%D0%B9_%D1%80%D0%B5%D0%B4%D0%B0%D0%BA%D1%82%D0%BE%D1%80_vim_-_%D0%BA%D1%80%D0%B0%D1%82%D0%BA%D0%BE%D0%B5_%D1%80%D1%83%D0%BA%D0%BE%D0%B2%D0%BE%D0%B4%D1%81%D1%82%D0%B2%D0%BE

Color PS1:

PS1="\[\033[0;33;40m[\t]\033 \[\033[1;31;40m[\033[1;32;40m\u@\h:\033[1;33;40m\w\033[1;31;40m]\033[1;35;40m $\033[0;37;0m\] "

( & )( ’ ' )( * )( [ ] ), ( ), { } )( ‘ ’, “ ”, « » )( / )( \ )( # )( § )( ~ )

амперсанд ( & )

апостроф ( ’ ' )

астериcк ( * )

скобки ( [ ], ( ), { } )

кавычки ( ‘ ’, “ ”, « » )

косая черта ( / )

обратная косая черта ( \ )

коммерческое at ( @ )

маркер списка ( • )

Циркумфлекс ( ^ )

октоторп/решётка/хеш ( # )

абзац ( ¶ )

знак параграфа ( § )

тильда ( ~ )

SCRIPTS :

1.Without empty lines:

egrep -v "^#|^$" /etc/squid/squid.conf
2.Switch register:

ls -al | awk '{print $9}' | tr [a-z] [A-Z]

3.All connection to 25 from one IP:

netstat -nt |grep ':25' |awk '{print $5}' |awk -F: '{print $1}' |sort -n |uniq |wc -l

4.Create random password:

head -c8 /dev/random | uuencode -m - | sed -n '2s/=*$//;2p'

5.Backup MySQL:

#!/bin/sh

WrkDir="/var/www/html"

BDir="/var/backup/new.name.kz"

User=root

Pass='pass'

Date=`date '+%Y-%m-%d'`

Subj="Web backup"

Mail='unixadmins@name.kz'

Bk="*.bcp"

DB_webs=(base_name)

Fs_webs=(dir_name)

if [ ! -d $BDir ]; then

mkdir $BDir

fi

find $BDir -type f -ctime +6 -exec rm -r "{}" ";"

cd ${WrkDir}

Count=${#DB_webs[*]}

/sbin/service httpd stop

for ((a=0; a < $Count; a++)); do /usr/bin/mysqldump -u${User} -p${Pass} ${DB_webs[$a]} > ${BDir}/${DB_webs[$a]}_${Date}.sql

/usr/bin/bzip2 ${BDir}/${DB_webs[$a]}_${Date}.sql

/bin/tar cpf - ${Fs_webs[$a]} | bzip2 -c > ${BDir}/${Fs_webs[$a]}_${Date}.tar.bz2

done

/sbin/service httpd start

cd ${BDir}

exit 0

6.File system report :

#!/bin/bash

# crontab - 15,45 * * * *

ReportDir=/usr/local/stat/report

Hostname=`hostname`

Mail='unixadmins@name.kz'

fs=(/) # df control

maxLimit=(90) # df control

TmpFile=file.tmp

Date=`date '+%Y-%m-%d'`

Hour=`date +%H`

Min=`date +%M`

if [ ! -d $ReportDir ]; then

mkdir $ReportDir

fi

if [ $Hour -eq 23 -a $Min -eq 45 ]; then

df -h | mail -s "df from server ${HOSTNAME}" $Mail

fi

cd $ReportDir

count=${#fs[@]}

df -h ${fs[*]} | sed -n '2,$p' | tr -d '\n' > $TmpFile

while read Line; do

FileSystem="`echo $Line | awk '{print $6}'`"

Use="`echo $Line | awk '{print substr ($5, 0, length($5)-1)}'`"

for ((a=0; a <>> ${TmpFile}.00

fi

fi

done

done < $TmpFile if [ -e "${TmpFile}.00" ];

then cat ${TmpFile}.00 | mail -s "Warning from server ${HOSTNAME}" $Mail rm ${TmpFile}.00

fi rm $TmpFile

exit 0

7.Collect statistics :

#! /bin/bash

ReportDir=/usr/local/stat/report

cd $ReportDir

echo ---------File Systems Utilization Statistics--------------------- > mon.list

df -h >> mon.list

echo ---------LASTLOG--------------------- >> mon.list

last -20 >> mon.list

echo ---------DIAGNOSTIC MESSAGES----- >> mon.list

tail -n 100 /var/log/messages >> mon.list

echo ---------DMESG MESSAGES---------- >> mon.list

dmesg | tail -n 60 >> mon.list

mailx -s WWW unixadmins@name.kz

exit 0

8.Copy local site to remoute host :

#!/bin/bash

WWW="/var/www/html"

DIR="/var/www/html/modules/general/"

BCKP="/var/backup/"

MAIL='unixadmins@name.kz'

mv $DIR/mysql.php $BCKP

cd $WWW

/bin/tar cfz $BCKP/site.tar.gz ./

mv $BCKP/mysql.php $DIR

cd $BCKP

/usr/bin/scp ./`ls -lhtr base_dump_name* | tail -1 | awk '{ print $9 }'` hosting@IP:/home/www

/usr/bin/scp ./site.tar.gz hosting@IP:/home/www

/usr/bin/ssh -l username IP "/home/www/sitecopy.sh" --->

#/home/www/sitecopy.sh :

##!/bin/bash

#cd /home/www

#tar xfz ./site.tar.gz

#bunzip2 ./base_dump_name*

#mysql -u user -ppass base_name < base_dump_name*

#rm -f ./base_dump_name*

#rm -f ./site.tar.gz

#chmod -R 755 /home/www/

#exit <---

if [ $? = 0 ];

then echo "WWW copy is OK" | mail -v $MAIL -s sitecopy

else echo "WWW copy looks NOT Good!" | mail -v $MAIL -s sitecopy

fi

rm -f $BCKP/site.tar.gz

exit 0

9.Copy to remoute :

#!/bin/sh

#sudo /etc/init.d/sendmail start;

BDir="/var/backup/new.name.kz";

Subj="WWW Backup to CVSLinux";

Mail='unixadmins@name.kz';

Data=`date '+%Y-%m-%d'`;

Report="/usr/local/stat/report/new.scp.file";

cd $BDir;

/usr/bin/scp *_${Data}* bcp@IP:/remout/dir/;

echo "=================BACKUP FILES================" > ${Report};

/usr/bin/ssh bcp@IP ls -l /remout/dir/ >> ${Report};

mailx -s "${Subj}" $Mail < ${Report} -v #&& sleep 5 && sudo /etc/init.d/sendmail stop exit 0

10.File renamer (simple)

#!/bin/bash

# renames.sh

# basic file renamer

criteria=$1

re_match=$2

replace=$3

for i in $( ls *$criteria* );

do

src=$i

tgt=$(echo $i | sed -e "s/$re_match/$replace/")

mv $src $tgt

done

11.Counter:

#!/bin/bash

COUNTER=0

while [ $COUNTER -lt 10 ]; do

echo The counter is $COUNTER

let COUNTER=COUNTER+1

done

12.Counter:

#!/bin/bash

COUNTER=20

until [ $COUNTER -lt 10 ]; do

echo COUNTER $COUNTER

let COUNTER-=1

done

13.Counter:

#!/bin/bash

# calculate.sh

# basic file calculate

name=loop

total=0

#

for f in *

do

[ ! -f $f ] && continue

if grep $name $f > /dev/null

then

size=`cat $f | wc -c`

total=`expr $total + $size`

fi

done

echo "Total size of all files containing $name is $total"

14.File system monitor:

#!/bin/bash

count=$(df -h | sed 's/%//g'| grep '/.'| awk '{print $5}')

for i in $count

do

if [[ $i -ge 12 ]]

then

echo "ALARM!"

fi

done

15.Check type of directory:

#!/bin/bash

echo "Enter directory name: "

read directory

#

while [ "$directory" ]

do

if [ ! -d "$directory" ]

then

echo "$directory must be direcoty!"

echo "Please try again :"

read directory

continue

fi

#

if [ `ls $directory | wc -l` -gt 100 ]

then

echo "Directory: $directory is too large!"

break

fi

#

if [ `echo $?` = 0 ]

then

echo "You choose right directory!: $directory"

break

fi

done

16.

#!/bin/bash

# Must be present links

# ln -s /usr/local/bin/wh /usr/local/bin/wh-ripe

# ln -s /usr/local/bin/wh /usr/local/bin/wh-cw

# ln -s /usr/local/bin/wh /usr/local/bin/wh-radb

if [ -z "$1" ]

then

echo "Use like: `basename $0` [domain-name]"

exit 65

fi

case `basename $0` in

"wh" ) whois $1@whois.ripe.net;;

"wh-ripe") whois $1@whois.ripe.net;;

"wh-radb") whois $1@whois.radb.net;;

"wh-cw" ) whois $1@whois.cw.net;;

* ) echo "Use like: `basename $0` [domain-name]";;

esac

exit 0

17.Function, for

#!/bin/bash

backup_these_files()

{

for FILE_NAME in $*

do

cp $FILE_NAME /backup/

echo "$FILE_NAME has been backed up!"

done

}

backup_these_files *.conf

18.

#!/bin/bash

echo -n "Please enter [Y|yes] : "

read YN

case $YN in

[yY]|[yY][eE][sS]) ls -la

echo "You entered $YN"

;;

*)

echo "You did not enter [Y|yes]"

esac

19.

#!/bin/bash

while true

do

$0 &

done

exit 0

ALARM!!!

20.

#!/bin/bash

ROOT_UID=0

E_WRONG_USER=65

E_NOSUCHUSER=70

SUCCESS=0

if [ "$UID" -ne "$ROOT_UID" ]

then

echo; echo "Are you root ?"; echo

exit $E_WRONG_USER

else

echo; echo "Setting password for user...."

fi

username=bozo

NEWPASSWORD=security_violation

cat /etc/passwd | grep -q "$username"

if [ $? -ne $SUCCESS ]

then

echo "No such $username "

exit $E_NOSUCHUSER

fi

echo "$NEWPASSWORD" | passwd --stdin "$username"

echo "Set password for $username !"

echo "DONE!"

exit 0

21.

Create a perimeter file, like so:

touch -t yyyymmddHHMM marker_date

List files older than the marker_date:

find . -type f ! -newer marker_date -ls

Likewise, for a range of dates:

Create the perimeter files:

touch -t yyyymmddHHMM range_start

touch -t yyyymmddHHMM range_end

List the files between the range dates:

find . -type f -newer range_start ! -newer range_end -ls

22.

find . -name *song*abc2009*.jpg |

sed 's/\(^.*song.*\)abc2009\(.*.jpg\)$/mv "&" "\1def2010\2"/' | sh

22.

#!/bin/bash
username=root
password=***

instance_1_server=10.2.7.107
instance_2_server=10.2.7.108
instance_3_server=10.2.7.109

servers=("$instance_1_server" "$instance_2_server" "$instance_3_server" )
for I in `cat /home/zhakutove/files.txt`
do
 i=1
 for server in ${servers[@]}; do
   expect -c "
             # exp_internal 1 # uncomment for debugging
             spawn /usr/bin/scp $I $username@$server:$I
             expect {
               "*password:*" { send $password\r\n; interact }
               eof { exit }
             }
             exit
             "
   let "i=i+1"
 done
done
exit 0

23.
#Run commands from /root/useradd.sh
for server in ${servers[@]}; do
 i=1
        /usr/bin/ssh root@$server '/bin/bash -s' < /root/useradd.sh
 let "i=i+1"
done

24.