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Script to Strip Extensions

root — Thu, 14 May 2009 19:01:14 -0700

Administrator@helios ~/poetry.bak
$ more strip.sh
#!/usr/bin/sh
for file in *.output
do
mv $file ${file%%.output}
done

Wrap Text In Multiple Files

root — Thu, 14 May 2009 18:59:57 -0700

Administrator@helios ~/poetry.bak
$ more wrapper.sh
#!/usr/bin/sh
for i in *.txt
do
fold -sw 65 $i > $i.output
done

Bash count lines in a file

root — Wed, 13 May 2009 21:51:20 -0700

Administrator@helios ~/poetry
$ find poetry-listing -print0 | xargs -0 wc -l
191 poetry-listing

Perl commands to make index from directory listing

root — Wed, 13 May 2009 21:17:19 -0700

Useful Perl commands
$ ls > poetry-listing
$ perl -pi -w -e 's/\
/\
\
/g;' poetry-listing
$ perl -pi -w -e 's/txt/txt\"/g;' poetry-listing
$ perl -pi -w -e 's/txt/txt\>/g;' poetry-listing
$ perl -pi -w -e 's/http/\ $ perl -pi -w -e 's/^/http\:\/\/mj12net.org\/poetry\//g;' poetry-listing

Perl Script Replaces White Spaces in File Names With Underscores

root — Wed, 13 May 2009 21:15:44 -0700

The following replaces white spaces in file names with under scores:

Administrator@helios ~
$ more changename.pl
#!/usr/bin/perl
use strict;
use warnings;
opendir(FH, ".") or die "Could not open directory: $!\n";
my @files = readdir FH;
closedir FH;

foreach my $old_name (@files) {
next if ($old_name eq '..' or $old_name eq '.');
my $new_name = $old_name;
$new_name =~ s/\s/_/g;
# replacing whitespace with underscore
if ($old_name ne $new_name) {
rename($old_name, $new_name) or die "Could not rename $old_name to
$new_name: $!";
print "Renamed '$old_name' to '$new_name'.\n"
}

}

System Administrator Interview Cheat Sheet I

root — Sun, 03 May 2009 20:34:21 -0700

System Administrator Interview Cheat Sheet I

System Administrator Interview Cheat Sheet Number II

root — Sun, 03 May 2009 20:33:03 -0700

System Administrator Interview Cheat Sheet II

Must Have for All Serious SysAdmins

root — Sun, 03 May 2009 20:31:07 -0700

SysAdmin Pocket Survival Guide

MJ12Net.org Script Repository

root — Sun, 03 May 2009 20:25:53 -0700

Scripts here, get your scripts here!!!!

Perl find replace string in multiple files

root — Sun, 19 Apr 2009 23:52:39 -0700

I needed to replace the string "#!/bin/bash" in all *.sh files in the current working directory with the string "#!/usr/bin/bash" and I'm in a Cygwin BASH Shell if that makes a difference. The eventual solution I found was:

Code:

$ perl -pi -w -e 's/#!\/bin\/bash/#!\/usr\/bin\/bash/g;' *.sh

Output:

Code:

Administrator@helios ~/bashdir

$ more arrays.sh

#!/usr/bin/bash

#Declare array with 4 elements

ARRAY=( 'Debian Linux' 'Redhat Linux' Ubuntu Linux )

# get number of elements in the array

ELEMENTS=${#ARRAY[@]}

# echo each element in array

# for loop

for (( i=0;i<$ELEMENTS;i++)); do

    echo ${ARRAY[${i}]}

done

BASH Scripts

root — Sun, 19 Apr 2009 20:53:49 -0700

Administrator@helios ~/bashdir

Code:

$ more arguments.sh

#!/bin/bash

# use predefined variables to access passed arguments

#echo arguments to the shell

echo $1 $2 $3 ' -> echo $1 $2 $3'

# We can also store arguments from bash command line in special array

args=("$@")

#echo arguments to the shell

echo ${args[0]} ${args[1]} ${args[2]} ' -> args=("$@"); echo ${args[0]} ${args[1

]} ${args[2]}'

#use $@ to print out all arguments at once

echo $@ ' -> echo $@'

# use $# variable to print out

# number of arguments passed to the bash script

echo Number of arguments passed: $# ' -> echo Number of arguments passed: $#'

Output:

Code:

Administrator@helios ~/bashdir

$ ./arguments.sh Bash Scripting Tutorial

Bash Scripting Tutorial  -> echo $1 $2 $3

Bash Scripting Tutorial  -> args=("$@"); echo ${args[0]} ${args[1]} ${args[2]}

Bash Scripting Tutorial  -> echo $@

Number of arguments passed: 3  -> echo Number of arguments passed: $#

Administrator@helios ~/bashdir

Code:

$ more read.sh

#!/bin/bash

echo -e "Hi, please type the word: \c "

read  word

echo "The word you entered is: $word"

echo -e "Can you please enter two words? "

read word1 word2

echo "Here is your input: \"$word1\" \"$word2\""

echo -e "How do you feel about bash scripting? "

# read command now stores a reply into the default build-in variable $REPLY

read

echo "You said $REPLY, I'm glad to hear that! "

echo -e "What are your favorite colours ? "

# -a makes read command to read into an array

read -a colours

echo "My favorite colours are also ${colours[0]}, ${colours[1]} and ${colours[2]

}:-)"

Output:

Code:

Administrator@helios ~/bashdir

$ ./read.sh

Hi, please type the word: linuxconfig.sh

The word you entered is: linuxconfig.sh

Can you please enter two words?

debian linux

Here is your input: "debian" "linux"

How do you feel about bash scripting?

it's great

You said it's great, I'm glad to hear that!

What are your favorite colours ?

blue and brown

My favorite colours are also blue, and and brown:-)

Administrator@helios ~/bashdir

Code:

$ more bash-trap.sh

#!/bin/bash

# bash trap command

trap bashtrap INT

# bash clear screen command

clear;

# bash trap function is executed when CTRL-C is pressed:

# bash prints message => Executing bash trap subrutine !

bashtrap()

{

    echo "CTRL+C Detected !...executing bash trap !"

}

# for loop from 1/10 to 10/10

for a in `seq 1 10`; do

    echo "$a/10 to Exit."

    sleep 1;

done

echo "Exit Bash Trap Example!!!"

Output:

Code:

Administrator@helios ~/bashdir

$ ./bash-trap.sh

./bash-trap.sh: line 5: clear: command not found

1/10 to Exit.

2/10 to Exit.

3/10 to Exit.

4/10 to Exit.

5/10 to Exit.

6/10 to Exit.

7/10 to Exit.

8/10 to Exit.

9/10 to Exit.

10/10 to Exit.

Exit Bash Trap Example!!!

Administrator@helios ~/bashdir

Code:

$ more arrays.sh

#!/bin/bash

#Declare array with 4 elements

ARRAY=( 'Debian Linux' 'Redhat Linux' Ubuntu Linux )

# get number of elements in the array

ELEMENTS=${#ARRAY[@]}

# echo each element in array

# for loop

for (( i=0;i<$ELEMENTS;i++)); do

    echo ${ARRAY[${i}]}

done

Output:

Code:

Administrator@helios ~/bashdir

$ ./arrays.sh

Debian Linux

Redhat Linux

Ubuntu

Linux

Administrator@helios ~/bashdir

Code:

$ more read-array.sh

#!/bin/bash

#Declare array

declare -a ARRAY

#Open file for reading to array

exec 10
let count=0

while read LINE <&10; do

    ARRAY[$count]=$LINE

    ((count++))

done

echo Number of elements: ${#ARRAY[@]}

# echo array's content

echo ${ARRAY[@]}

# close file

exec 10>&-

Output:

Code:

Administrator@helios ~/bashdir

$ ./read-array.sh

Number of elements: 4

Debian Linux Redhat Linux Ubuntu Linux

Administrator@helios ~/bashdir

Code:

$ more if-else.sh

#!/bin/bash

directory="./BashScripting"

# bash check if directory exists

if [ -d $directory ]; then

        echo "Directory exists"

else

        echo "Directory does not exists"

fi

Output:

Code:

Administrator@helios ~/bashdir

$ ./if-else.sh

Directory does not exists

Administrator@helios ~/bashdir

$ mkdir BashScripting

Administrator@helios ~/bashdir

$ ./if-else.sh

Directory exists

Administrator@helios ~/bashdir

Code:

$ more nested-if-else.sh

#!/bin/bash

# Declare variable choice and assign value 4

choice=4

# Print to stdout

 echo "1. Bash"

 echo "2. Scripting"

 echo "3. Tutorial"

 echo -n "Please choose a word [1,2 or 3]? "

# Loop while the variable choice is equal 4

# bash while loop

while [ $choice -eq 4 ]; do

# read user input

read choice

# bash nested if/else

if [ $choice -eq 1 ] ; then

        echo "You have chosen word: Bash"

else

        if [ $choice -eq 2 ] ; then

                 echo "You have chosen word: Scripting"

        else

                if [ $choice -eq 3 ] ; then

                        echo "You have chosen word: Tutorial"

                else

                        echo "Please make a choice between 1-3 !"

                        echo "1. Bash"

                        echo "2. Scripting"

                        echo "3. Tutorial"

                        echo -n "Please choose a word [1,2 or 3]? "

                        choice=4

                fi

        fi

fi

done

Output:

Code:

Administrator@helios ~/bashdir

$ ./nested-if-else.sh

1. Bash

2. Scripting

3. Tutorial

Please choose a word [1,2 or 3]? 2

You have chosen word: Scripting

Administrator@helios ~/bashdir

Code:

$ more statement.sh

#!/bin/bash

# declare integers

NUM1=2

NUM2=2

if [ $NUM1 -eq $NUM2 ]; then

        echo "Both Values are equal"

else

        echo "Values are NOT equal"

fi

Output:

Code:

Administrator@helios ~/bashdir

$ ./statement.sh

Both Values are equal

Administrator@helios ~/bashdir

Code:

$ more statement2.sh

#!/bin/bash

# declare integers

NUM1=2

NUM2=1

if [ $NUM1 -eq $NUM2 ]; then

        echo "Both Values are equal"

else

        echo "Values are NOT equal"

fi

Output:

Code:

Administrator@helios ~/bashdir

$ ./statement2.sh

Values are NOT equal

Administrator@helios ~/bashdir

Code:

$ more statement3.sh

#!/bin/bash

# declare integers

NUM1=2

NUM2=1

if   [ $NUM1 -eq $NUM2 ]; then

        echo "Both Values are equal"

elif [ $NUM1 -gt $NUM2 ]; then

        echo "NUM1 is greater then NUM2"

else

        echo "NUM2 is greater then NUM1"

fi

Output:

Code:

Administrator@helios ~/bashdir

[code]

$ ./statement3.sh

NUM1 is greater then NUM2

Administrator@helios ~/bashdir

Code:

$ more statement4.sh

#!/bin/bash

#Declare string S1

S1="Bash"

#Declare string S2

S2="Scripting"

if [ $S1 = $S2 ]; then

        echo "Both Strings are equal"

else

        echo "Strings are NOT equal"

fi

Output:

Code:

Administrator@helios ~/bashdir

$ ./statement4.sh

Strings are NOT equal

Administrator@helios ~/bashdir

Code:

$ more statement5.sh

#!/bin/bash

#Declare string S1

S1="Bash"

#Declare string S2

S2="Bash"

if [ $S1 = $S2 ]; then

        echo "Both Strings are equal"

else

        echo "Strings are NOT equal"

fi

Output:

Code:

Administrator@helios ~/bashdir

$ ./statement5.sh

Both Strings are equal

Administrator@helios ~/bashdir

Code:

$ more filetesting.sh

#!/bin/bash

file="./file"

if [ -e $file ]; then

        echo "File exists"

else

        echo "File does not exists"

fi

Administrator@helios ~/bashdir

Code:

$ ./filetesting.sh

File does not exists

Administrator@helios ~/bashdir

$ touch file

Administrator@helios ~/bashdir

Code:

$ more filetesting2.sh

#!/bin/bash

while [ ! -e myfile ]; do

# Sleep until file does exists/is created

sleep 1

done

Output:

Code:

Administrator@helios ~/bashdir

$ ./filetesting2.sh

In another terminal window:

Code:

Administrator@helios ~

$ cd bashdir/

Administrator@helios ~/bashdir

$ touch myfile

In the original terminal windows:

Code:

Administrator@helios ~/bashdir

$

The loop exits to the prompt because the file "myfile" exists.

Administrator@helios ~/bashdir

Code:

$ more for1.sh

#!/bin/bash

# bash for loop

for f in $( ls /var/ ); do

        echo $f

done

Output:

Code:

Administrator@helios ~/bashdir

$ ./for1.sh

cache

cron

empty

lib

log

run

tmp

Administrator@helios ~/bashdir

Code:

$ more while_lopp.sh

#!/bin/bash

COUNT=6

# bash while loop

while [ $COUNT -gt 0 ]; do

        echo Value of count is: $COUNT

        let COUNT=COUNT-1

done

Output:

Code:

Administrator@helios ~/bashdir

$ ./while_lopp.sh

Value of count is: 6

Value of count is: 5

Value of count is: 4

Value of count is: 3

Value of count is: 2

Value of count is: 1

Administrator@helios ~/bashdir

Code:

$ more until.sh

#!/bin/bash

COUNT=0

# bash until loop

until [ $COUNT -gt 5 ]; do

        echo Value of count is: $COUNT

        let COUNT=COUNT+1

done

Output:

Code:

Administrator@helios ~/bashdir

$ ./until.sh

Value of count is: 0

Value of count is: 1

Value of count is: 2

Value of count is: 3

Value of count is: 4

Value of count is: 5

Administrator@helios ~/bashdir

Code:

$ more script.sh

#!/bin/bash

# This bash script will locate and replace spaces

# in the filenames

DIR="."

# Controlling a loop with bash read command by redirecting STDOUT as

# a STDIN to while loop

# find will not truncate filenames containing spaces

find $DIR -type f | while read file; do

# using POSIX class [:space:] to find space in the filename

if [[ "$file" = *[[:space:]]* ]]; then

# substitute space with "_" character and consequently rename the file

mv "$file" `echo $file | tr ' ' '_'`

fi;

# end of while loop

done

Output:

Code:

Administrator@helios ~/bashdir

$ touch "file with space"

Administrator@helios ~/bashdir

$ ls -ld "file with space"

-rw-r--r-- 1 Administrator None 0 Apr 19 22:26 file with space

Administrator@helios ~/bashdir

$ ./script.sh

Administrator@helios ~/bashdir

$ ls -ld "file with space"

ls: cannot access file with space: No such file or directory

Administrator@helios ~/bashdir

$ ls -l file*

-rw-r--r-- 1 Administrator None   0 Apr 19 21:50 file

-rw-r--r-- 1 Administrator None   0 Apr 19 22:26 file_with_space

-rwxr-xr-x 1 Administrator None 107 Apr 19 21:48 filetesting.sh

-rwxr-xr-x 1 Administrator None  94 Apr 19 21:52 filetesting2.sh

Administrator@helios ~/bashdir

Code:

$ more functions.sh

#!/usr/bin/bash

# BASH FUNCTIONS CAN BE DECLARED IN ANY ORDER

function function_B {

        echo Function B.

}

function function_A {

        echo $1

}

function function_D {

        echo Function D.

}

function function_C {

        echo $1

}

# FUNCTION CALLS

# Pass parameter to function A

function_A "Function A."

function_B

# Pass parameter to function C

function_C "Function C."

function_D

Output:

Code:

Administrator@helios ~/bashdir

$ ./functions.sh

Function A.

Function B.

Function C.

Function D.

Administrator@helios ~/bashdir

Code:

$ more select.sh

#!/bin/bash

PS3='Choose one word: '

# bash select

select word in "linux" "bash" "scripting" "tutorial"

do

  echo "The word you have selected is: $word"

# Break, otherwise endless loop

  break

done

exit 0

Output:

Code:

Administrator@helios ~/bashdir

$ ./select.sh

1) linux

2) bash

3) scripting

4) tutorial

Choose one word: 3

The word you have selected is: scripting

Perl Scripts

root — Sun, 19 Apr 2009 20:16:24 -0700