Checking in old svn stuff

Author: Gilberto Alvarado

README.md

@@ -1,4 +1,5 @@
 unixstuff
 =========
 
-Unix stuff of course
+Compendium of unix exercises and useful utilities.
+

advanced/password_checker

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+#!/bin/bash
+
+if [ $# = 0 ]; then
+	echo "Usage: `basename $0` [password]"
+	exit
+fi
+
+password=$1
+length=`expr length $password`
+echo "Length: $length"
+if [ $length -le "8" ]; then
+	echo "Password should be at least 8 characters"; exit 0
+elif [ ! `echo "$password" | grep -e [0-9]` ]; then
+	echo "Password must contain at least one number"
+elif [ ! `echo $password | grep [\@\#\$\%\\*\\+\-\=]` ]; then
+	echo "Password must contain at least one special character (@#$%$*+-=)"; exit 0
+else
+	echo "Password is valid!"
+fi

basic/back_myself_up

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+#!/bin/bash
+
+#Script that backs itself up
+
+cat `basename $0` > backup.sh
+
+

basic/directory_listing

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+#!/bin/bash
+
+#Script to list (recursively) any given directory contents and save them to a file
+
+if [ $# != 2 ]; then
+	echo "Usage: `basename $0` [directory] [backup_filename]"
+	exit
+fi
+
+dir=$1
+filename=$2
+ls -la $1 > $2

basic/karaoke

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+#!/bin/bash
+
+if [ $# = 0 ]; then
+	echo "Usage: karaoke [filename]"; exit 1
+else
+	file=$1
+	if [ ! -f $file ]; then
+		echo "File $file does not exist"; exit 0
+	fi
+fi
+
+clear
+echo -n
+i=1
+#Print bold text
+#\033 is an escape sequence, [1 turns on the bold attribute, [0 turns it off
+while read line; do
+	echo -e "\033[${i}m$line\033[0m"
+	sleep 1
+done<$file
+

basic/options

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+#!/bin/bash
+
+#Script for getopts demonstration
+# 
+# while getopts cdme OPTION; do
+# case ${OPTION} in
+# 	c) clear;;
+# 	d) ls -l ;;
+# 	m) echo "WTF is midnight commander?";;
+# 	e) vi ;;
+# 	*) echo "Invalid option"
+# esac
+# done
+
+while getopts d:b:n:h OPTION; do
+       case ${OPTION} in
+           d) BACKUP_DIR=$OPTARG;;
+           b) SLIDESHOWPRO_DIR=$OPTARG;;
+           n) NUMBER_BACKUPS_PRESERVED=$OPTARG;;
+           h) usage;;
+       esac
+   done
+   echo $BACKUP_DIR
+   echo $SLIDESHOWPRO_DIR
+   echo $NUMBER_BACKUPS_PRESERVED

basic/q16_colorful

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+#!/bin/bash
+
+#Script for colorful prints
+#Color	Foreground	Background
+#black		30	40
+#red		31	41
+#green		32	42
+#yellow		33	43
+#blue		34	44
+#magenta	35	45
+#cyan		36	46
+#white		37	47
+
+clear
+
+echo -n
+#Print bold text
+#\033 is an escape sequence, [1 turns on the bold attribute, [0 turns it off
+echo -e "\033[1mThis is your life\033[0m"
+#Blink text
+echo -e "\033[5mBy The Killers\033[0m"
+#Underlined text
+echo -e "\033[4m Candid talks with strangers\033[0m"
+#Background color change. \E indicates background. First color is foreground 
+#second color is background
+#tput sgr0 returns the terminal to its original state(you can also use \E[0m)
+echo -e '\E[34;47mBeauty lifes in danger'; tput sgr0
+echo -e '\E[1;33;44mNo one gives a damn about your hair'; tput sgr0
+
+
+ 

basic/q4_calculator

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+#!/bin/bash
+
+#Basic calculator script
+#using case statement to perform basic math operation as follows:
+#+ addition
+#- subtraction
+#x multiplication
+#/ division
+# Usage example:
+#$ ./calculator 20 / 3, 
+#Also checks for sufficient command line arguments
+
+#first step: 3 and only 3 arguments
+if [ $# != 3 ]; then
+	echo "3 arguments are required [operand][operator][operand]"
+else
+	op1=$1
+	op2=$3
+	#Let's check operands
+	case $2 in
+		+) result=$(($op1 + $op2));;
+		-) result=$(($op1 - $op2));;
+		x) result=$(($op1 * $op2));;
+		/) result=$(($op1 / $op2));;
+		*) echo "Invalid operand";
+	esac
+	if [ ! -z $result ]; then
+		echo $result
+	fi
+fi
+

basic/q6_reverse

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+#!/bin/bash
+
+#script to print given number in reverse order, for eg. If no is 123 it must print as 321.
+
+#check for argument or add default
+if [ $# = 0 ]; then
+	arg="backwards"
+else
+	arg=$1
+fi
+#rev is a unix tool to reverse a string
+#This may fail if rev is in the wrong place
+result=`echo "$arg" | /usr/bin/rev`
+echo $result

basic/q7_sum_digits

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+#!/bin/bash
+
+#script to print given numbers sum of all digit, 
+#For eg. If no is 123 it's sum of all digit will be 1+2+3 = 6.
+
+if [ $# = 0 ]; then
+	echo "Please provide a number"
+else
+	sum=0
+	number=$1
+	#we have to know the length of the string
+	#expr evaluates an expression and lets us manipulate strings
+	length=`expr length $number`
+	for((i=1; i<=$length; i++)); do
+		digit=`expr substr $number $i 1`
+		sum=$(($sum + $digit))
+	done
+	echo $sum
+fi

basic/sayhi

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+#!/bin/bash
+#Script for test (if)
+#Gets the time and salutes accordingly
+
+FECHA=`date`;
+TIME=`date +%k`;
+if [ $TIME -le "6" ]; then
+	MSG="Dude, you should be sleeping ";
+elif [ $TIME -le "12" ]; then
+	MSG="Good morning ";
+elif [ $TIME -le "19" ]; then
+	MSG="Good afternoon ";
+elif [ $TIME -le "24" ]; then
+	MSG="Good night ";
+fi
+echo $MSG $1
+echo "today is: " $FECHA;
+echo "Users connected to the system: ";
+who

files/addnames

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+#!/bin/bash
+
+#Check number of arguments
+if [ $# != 2 ]; then
+	echo "Exactly two arguments must be provided"
+	exit;
+fi
+#Check filename
+if [ -f $1 ]; then
+	echo "File $1 found"
+	#Check if the name is already in the file
+	name=`grep "$2" $1`
+	if [ -n "$name" ]; then
+		#Name is already in the file
+		echo "Name found: $name"
+	else
+		# Concatenate name to current file
+		$2 >> $1
+	fi
+else
+	echo "File $1 does not exist"
+	exit;
+fi
+

files/backup_files

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+#!/bin/bash
+
+#Backup files script
+#It will look for all the files with a given extension, remove dashes and spaces and back them up with a .bak extension.
+BACKUP_DIR="$HOME/backup"
+
+if [ $# = 0 ]; then
+	ext="*"
+else
+	ext="*.$1"
+fi
+
+if [ ! -d $BACKUP_DIR ]; then
+	mkdir $BACKUP_DIR
+fi
+
+for file in $ext; do
+	if [ -d $file ]; then
+		r="-r"
+	fi
+	cp $r "$file" "$BACKUP_DIR/`echo $file | sed -e 's| ||g' -e 's|-||'`"
+	r=""
+#	echo "$BACKUP_DIR/$file"
+done

files/classlist.txt

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+Oscar Gonzalez Huicochea
+Roberto Carrera Maldonado
+Daniel Valencia Backhoff
+Raul Alberto Huerta Barajas
+Raymundo Torres Bernal
+Nikita Belenkyi
+Jorge Galindo Robles
+Gabriela Huerta De la Sota Valek
+Sandra De la Torre Avila
+Francisco Carrillo Dominguez

files/create_dirs

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+#!/bin/bash
+
+#Check number of arguments
+if [ $# = 0 ]; then
+	echo "Please provide filename as an argument"
+	exit
+fi
+
+if [ -f $1 ]; then
+	#File exits, let's read it and create some directories
+	#First, parent directory	
+	if [ ! -d "submit" ]; then
+		`mkdir submit`
+	fi
+	while read line; do
+		#Check that directory does not exist yet
+		if [ ! -d "./submit/$line" ]; then
+			`mkdir "./submit/$line"`
+		fi
+	done < $1
+else
+	#File does not exist.
+	echo "File $1 does not exist"	
+	exit
+fi

files/create_test_files

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+#!/bin/bash
+
+#Script to create test files
+#An extension can be added as an argument. Default extension will be .txt
+
+#Check for optional extension
+DIR="test_files"
+if [ $# = 0 ]; then
+	ext="txt"
+else
+	ext="$1"
+fi
+
+if [ ! -d $DIR ]; then
+	mkdir $DIR
+fi
+
+# Create files
+for i in {0..5}; do
+	touch "./$DIR/$i. - file.$ext"
+done

files/list_files

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+#!/bin/bash
+
+echo "Files in this directory that match *~ :"
+for file in *~; do
+	echo $file
+done
+

loops/countdown

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+#!/bin/bash
+#Despliega los numeros del 1 al 20
+var=20
+while [ $var -ge 0 ]; do
+	echo $var
+	let "var -= 1"
+done
+echo "GO!"

loops/countdown2

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+#!/bin/bash
+#Displays the numbers from param to 1
+
+echo "Enter a number to start counting: "
+#Read variable from command line
+read var
+#Check if variable is not null (-z)
+if [ -z $var ]; then
+	echo "No number detected. Defaut value is 20"
+#assign 20 to var as default value
+	let "var = 20"
+fi
+
+while [ $var -ge 0 ]; do
+        echo $var
+        let "var -= 1"
+done
+echo "GO!"  
+           

loops/quoting

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+#!/bin/bash
+
+echo "WTF Script"
+list="yo tu el"
+for a in $list; do
+	echo "El es $a"
+done
+