LINUX Beginners

Tuesday, 1 November 2011

ans21

program1:

#

echo "Can you see the following:"

for (( i=1; i<=5; i++ ))
do
    for (( j=1; j<=i;  j++ ))
    do
     echo -n "$i"
    done
    echo ""
done

#

program2:

#

echo "Can you see the following:"

for (( i=1; i<=5; i++ ))
do
    for (( j=1; j<=i;  j++ ))
    do
     echo -n "$j"
    done
    echo ""
done

#

program3:

#

echo "Climb the steps of success"

for (( i=1; i<=5; i++ ))
do
    for (( j=1; j<=i;  j++ ))
    do
     echo -n " |"
    done
    echo "_ "
done

#

program4:

#

echo "Stars"

for (( i=1; i<=5; i++ ))
do
    for (( j=1; j<=i;  j++ ))
    do
     echo -n " *"
    done
    echo ""
done

#

program5:

#

echo "Stars"

for (( i=1; i<=5; i++ ))
do
    for (( j=1; j<=i;  j++ ))
    do
     echo -n " *"
    done
    echo ""
done

for (( i=5; i>=1; i-- ))
do
    for (( j=1; j<=i;  j++ ))
    do
     echo -n " *"
    done
    echo ""
done

#

program6:

clear

for (( i=1; i<=3; i++ ))
do
    for (( j=1; j<=i;  j++ ))
    do
     echo -n "|Linux"
    done
    echo "______"
done

for (( i=3; i>=1; i-- ))
do
    for (( j=1; j<=i;  j++ ))
    do
     echo -n "|Linux"
    done
    
    if [ $i -eq 3 ]; then
       echo -n "______"
       echo -n -e ">> Powerd Server.\n"
    else
       echo "~~~~~"
    fi
done

program7:

MAX_NO=0

echo -n "Enter Number between (5 to 9) : "
read MAX_NO

if ! [ $MAX_NO -ge 5 -a $MAX_NO -le 9 ] ; then
   echo "I ask to enter number between 5 and 9, Okay"
   exit 1
fi

clear

for (( i=1; i<=MAX_NO; i++ ))
do
    for (( s=MAX_NO; s>=i; s-- ))
    do
       echo -n " "
    done
    for (( j=1; j<=i;  j++ ))
    do
     echo -n " $i" 
    done
    echo ""
done

for (( i=1; i<=MAX_NO; i++ ))
do
    for (( s=MAX_NO; s>=i; s-- ))
    do
       echo -n " "
    done
    for (( j=1; j<=i;  j++ ))
    do
     echo -n " ."
    done
    echo ""
done

echo -e "\n\n\t\t\tI hope you like it my stupidity (?)"

program8:

MAX_NO=0

echo -n "Enter Number between (5 to 9) : "
read MAX_NO

if ! [ $MAX_NO -ge 5 -a $MAX_NO -le 9 ] ; then
   echo "I ask to enter number between 5 and 9, Okay"
   exit 1
fi

clear

for (( i=1; i<=MAX_NO; i++ ))
do
    for (( s=MAX_NO; s>=i; s-- ))
    do
       echo -n " "
    done
    for (( j=1; j<=i;  j++ ))
    do
     echo -n " $i" 
    done
    echo ""
done

for (( i=1; i<=MAX_NO; i++ ))
do
    for (( s=MAX_NO; s>=i; s-- ))
    do
       echo -n " "
    done
    for (( j=1; j<=i;  j++ ))
    do
     echo -n " ."
    done
    echo ""
done

echo -e "\n\n\t\t\tI hope you like it my stupidity (?)"

program9:

MAX_NO=0

echo -n "Enter Number between (5 to 9) : "
read MAX_NO

if ! [ $MAX_NO -ge 5 -a $MAX_NO -le 9 ] ; then
   echo "I ask to enter number between 5 and 9, Okay"
   exit 1
fi

clear

for (( i=1; i<=MAX_NO; i++ ))
do
    for (( s=MAX_NO; s>=i; s-- ))
    do
       echo -n " "
    done
    for (( j=1; j<=i;  j++ ))
    do
     echo -n " ." 
    done
    echo ""
done
###### Second stage ######################
##
##
for (( i=MAX_NO; i>=1; i-- ))
do
    for (( s=i; s<=MAX_NO; s++ ))
    do
       echo -n " "
    done
    for (( j=1; j<=i;  j++ ))
    do
     echo -n " ."
    done
    echo ""
done


echo -e "\n\n\t\t\tI hope you like it my stupidity (?)"

answers10-19

before every program add #!/bin/bash

# Q10
#
a=5.66
b=8.67
c=`echo $a + $b | bc`
echo "$a + $b = $c"

#

-----------------------------------------------------------------------------------------

# Q11

if [ $# -ne 1 ]
thenecho "Usage - $0  file-name"
    exit 1
fi

if [ -f $1 ]
then
    echo "$1 file exist"
else
    echo "Sorry, $1 file does not exist"
fi
    

#

--------------------------------------------------------------------------------------------

# Q12 
# Script to check whether "/*" is included, in $1 or not
# 

cat "$1" > /tmp/file.$$   2>/tmp/file0.$$

grep "*"  /tmp/file.$$    >/tmp/file0.$$

if [ $? -eq 1 ]
then
    echo "Required i.e. $1/*"
else
    echo "Symbol is Not required"    
fi    

rm -f /tmp/file.$$
rm -f /tmp/file0.$$
#

 --------------------------------------------------------------------------------------------

# Q13
#
# Shell script to print contains of file from given line no to next 
# given  numberlines
#

#
# Print error / diagnostic for user if no arg's given
#
if [ $# -eq 0 ] 
then
    echo "$0:Error command arguments missing!"
    echo "Usage: $0 start_line   uptoline   filename"
    echo "Where start_line is line number from which you would like to print file"
    echo "uptoline is line number upto which would like to print"
    echo "For eg. $0 5 5 myfile"
    echo "Here from myfile total 5 lines printed starting from line no. 5 to"
    echo "line no 10."
    exit 1
fi

#
# Look for sufficent arg's
#

    if [ $# -eq 3 ]; then
 if [ -e $3 ]; then
         tail +$1 $3 | head -n$2
         else
         echo "$0: Error opening file $3" 
     exit 2
 fi   
    else
        echo "Missing arguments!" 
    fi

#

--------------------------------------------------------------------------------------------

# Q14
# -c clear
# -d dir
# -m mc
# -e vi { editor }
#

#
# Function to clear the screen
#
cls()
{
    clear
    echo "Clear screen, press a key . . ."
    read
    return
}

#
# Function to show files in current directory 
#
show_ls()
{   
    ls
    echo "list files, press a key . . ."
    read
    return
}

#
# Function to start mc
#
start_mc()
{
    if which mc > /dev/null ; then
 mc
 echo "Midnight commander, Press a key . . ."
 read
    else
 echo "Error: Midnight commander not installed, Press a key . . ."
 read
    fi  
    return
}

#
# Function to start editor 
#
start_ed()
{
    ced=$1
    if which $ced > /dev/null ; then
 $ced
 echo "$ced, Press a key . . ."
 read
    else
 echo "Error: $ced is not installed or no such editor exist, Press a key . . ."
 read
    fi  
    return
}

#
# Function to print help
#
print_help_uu()
{
    echo "Usage: $0 -c -d -m -v {editor name}"; 
    echo "Where -c clear the screen";
    echo "      -d show dir";
    echo "      -m start midnight commander shell";
    echo "      -e {editor}, start {editor} of your choice";
    return
}

#
# Main procedure start here
#
# Check for sufficent args
#

if [ $# -eq 0 ] ; then
    print_help_uu
    exit 1
fi    

#
# Now parse command line arguments
#
while getopts cdme: opt
do
    case "$opt" in
 c) cls;;
 d) show_ls;;
 m) start_mc;;
 e) thised="$OPTARG"; start_ed $thised ;;
 \?) print_help_uu; exit 1;; 
    esac
done

---------------------------------------------------------------------------------------------

# Q15
#

temph=`date | cut -c12-13`
dat=`date +"%A %d in %B of %Y (%r)"`

if [ $temph -lt 12 ]
then
    mess="Good Morning $LOGNAME, Have nice day!"
fi

if [ $temph -gt 12 -a $temph -le 16 ]
then
    mess="Good Afternoon $LOGNAME"
fi

if [ $temph -gt 16 -a $temph -le 18 ]
then
    mess="Good Evening $LOGNAME"
fi

if which dialog > /dev/null
then
    dialog --backtitle "Linux Shell Script Tutorial"\
    --title "(-: Welcome to Linux :-)"\
    --infobox "\n$mess\nThis is $dat" 6 60
    echo -n "                            Press a key to continue. . .                        "
    read
    clear
else
    echo -e "$mess\nThis is $dat"
fi


#

---------------------------------------------------------------------------------------------

# Q16
# echo command with escape sequance to give differnt effects
#
# Syntax: echo -e "escape-code your message, var1, var2 etc"
# For eg. echo -e "\033[1m  Hello World"
#                   |         |
#                   |         | 
#               Escape code   Message
#

clear 
echo -e "\033[1m Hello World"
 # bold effect
echo -e "\033[5m Blink"
       # blink effect
echo -e "\033[0m Hello World"
 # back to noraml

echo -e "\033[31m Hello World"
 # Red color
echo -e "\033[32m Hello World"
 # Green color
echo -e "\033[33m Hello World"
 # See remaing on screen
echo -e "\033[34m Hello World"
echo -e "\033[35m Hello World"
echo -e "\033[36m Hello World"

echo -e -n "\033[0m "
  # back to noraml

echo -e "\033[41m Hello World"
echo -e "\033[42m Hello World"
echo -e "\033[43m Hello World"
echo -e "\033[44m Hello World"
echo -e "\033[45m Hello World"
echo -e "\033[46m Hello World"


echo -e "\033[0m Hello World"
  # back to noraml
#

 ---------------------------------------------------------------------------------------------

# Q17
# To run type at $ promot as
# $ q17 &
#

echo 
echo "Digital Clock for Linux"
echo "To stop this clock use command kill pid, see above for pid"
echo "Press a key to continue. . ."

while :
do
    ti=`date +"%r"`      
    echo -e -n "\033[7s"    #save current screen postion & attributes
    #
    # Show the clock
    #
    
    tput cup 0 69          # row 0 and column 69 is used to show clock
    
    echo -n $ti            # put clock on screen
     
    echo -e -n "\033[8u"   #restore current screen postion & attributs
    #
    #Delay fro 1 second
    #
    sleep 1
done

#

answer 18

#!/bin/bash

show_datetime()
{
   dialog --backtitle "Linux Shell Tutorial" --title "System date and Time" --infobox "Date is `date`" 3 40 
   read
   return
}

show_cal()
{
   cal > menuchoice.temp.$$
   dialog --backtitle "Linux Shell Tutorial" --title "Calender" --infobox "`cat menuchoice.temp.$$`" 9 25 
   read
   rm -f menuchoice.temp.$$
   return
}

delete_file()
{
 dialog --backtitle "Linux Shell Tutorial" --title "Delete file"\
 --inputbox "Enter directory path (Enter for Current Directory)"\
 10 40  2>/tmp/dirip.$$
 rtval=$?
 
 case $rtval in
     1) rm -f /tmp/dirip.$$ ; return ;;
     255) rm -f /tmp/dirip.$$ ; return ;;
 esac
 
 mfile=`cat /tmp/dirip.$$`
 
 if [ -z $mfile ]
 then
     mfile=`pwd`/*
 else
     grep "*" /tmp/dirip.$$
     if [ $? -eq 1 ]
     then
 mfile=$mfile/*
     fi    
 fi
 
 for i in $mfile 
 do
    if [ -f $i ]
    then
 echo "$i Delete?" >> /tmp/finallist.$$
    fi 
 done    


 dialog --backtitle "Linux Shell Tutorial" --title "Select File to Delete"\
 --menu "Use [Up][Down] to move, [Enter] to select file"\
 20 60 12 `cat /tmp/finallist.$$` 2>/tmp/file2delete.tmp.$$
 
 rtval=$? 
 
 file2erase=`cat /tmp/file2delete.tmp.$$`
 
 case $rtval in 
     0) dialog --backtitle "Linux Shell Tutorial" --title "Are you shur"\
      --yesno "\n\nDo you want to delete : $file2erase " 10 60
      
        if [ $? -eq 0 ] ; then
   rm -f  $file2erase         
         if [ $? -eq 0 ] ; then
            dialog --backtitle "Linux Shell Tutorial"\
     --title "Information: Delete Command" --infobox "File: $file2erase is Sucessfully deleted,Press a key" 5 60
     read
    else
     dialog --backtitle "Linux Shell Tutorial"\ 
     --title "Error: Delete Command" --infobox "Error deleting File: $file2erase, Press a key" 5 60
            read       
           fi
 else
   dialog --backtitle "Linux Shell Tutorial"\
   --title "Information: Delete Command" --infobox "File: $file2erase is not deleted, Action is canceled, Press a key" 5 60
   read
 fi
     ;;
    1)  rm -f /tmp/dirip.$$ ; rm -f /tmp/finallist.$$ ; 
        rm -f /tmp/file2delete.tmp.$$; return;;
    255) rm -f /tmp/dirip.$$ ;  rm -f /tmp/finallist.$$ ;
         rm -f /tmp/file2delete.tmp.$$; return;;
esac
 rm -f /tmp/dirip.$$
 rm -f /tmp/finallist.$$
 rm -f /tmp/file2delete.tmp.$$
 return
}



while true
do
dialog --clear --title "Main Menu" \
        --menu "To move [UP/DOWN] arrow keys \n\
[Enter] to Select\n\
        Choose the Service you like:" 20 51 4 \
        "Date/time"       "To see System Date & Time" \
        "Calender"        "To see Calaender"\
 "Delete"          "To remove file"\
 "Exit"            "To exit this Program" 2> menuchoice.temp.$$

retopt=$?

choice=`cat menuchoice.temp.$$`

rm -f menuchoice.temp.$$

case $retopt in
    0)
 case $choice in
     Date/time) show_datetime ;;
     Calender) show_cal ;;
     Delete) delete_file ;;
     Exit) exit 0;; 
        esac    
      ;; 
     1) exit ;;
     255) exit ;;
 esac
done
clear

#

--------------------------------------------------------------------------------------------

# Q19
#

nouser=`who | wc -l`
echo -e "User name: $USER (Login name: $LOGNAME)" >> /tmp/info.tmp.01.$$$
echo -e "Current Shell: $SHELL"  >> /tmp/info.tmp.01.$$$
echo -e "Home Directory: $HOME" >> /tmp/info.tmp.01.$$$
echo -e "Your O/s Type: $OSTYPE" >> /tmp/info.tmp.01.$$$
echo -e "PATH: $PATH" >> /tmp/info.tmp.01.$$$
echo -e "Current directory: `pwd`" >> /tmp/info.tmp.01.$$$
echo -e "Currently Logged: $nouser user(s)" >> /tmp/info.tmp.01.$$$

if [ -f /etc/redhat-release ]
then
    echo -e "OS: `cat /etc/redhat-release`" >> /tmp/info.tmp.01.$$$
fi

if [ -f /etc/shells ]
then
    echo -e "Available Shells: " >> /tmp/info.tmp.01.$$$
    echo -e "`cat /etc/shells`"  >> /tmp/info.tmp.01.$$$
fi
    
if [ -f /etc/sysconfig/mouse ]
then
    echo -e "--------------------------------------------------------------------" >> /tmp/info.tmp.01.$$$ 
    echo -e "Computer Mouse Information: " >> /tmp/info.tmp.01.$$$
    echo -e "--------------------------------------------------------------------" >> /tmp/info.tmp.01.$$$ 
    echo -e "`cat /etc/sysconfig/mouse`" >> /tmp/info.tmp.01.$$$ 
fi
echo -e "--------------------------------------------------------------------" >> /tmp/info.tmp.01.$$$ 
echo -e "Computer CPU Information:" >> /tmp/info.tmp.01.$$$ 
echo -e "--------------------------------------------------------------------" >> /tmp/info.tmp.01.$$$ 
cat /proc/cpuinfo >> /tmp/info.tmp.01.$$$

echo -e "--------------------------------------------------------------------" >> /tmp/info.tmp.01.$$$ 
echo -e "Computer Memory Information:" >> /tmp/info.tmp.01.$$$ 
echo -e "--------------------------------------------------------------------" >> /tmp/info.tmp.01.$$$ 
cat /proc/meminfo >> /tmp/info.tmp.01.$$$

if [ -d /proc/ide/hda ]
then
    echo -e "--------------------------------------------------------------------" >> /tmp/info.tmp.01.$$$ 
    echo -e "Hard disk information:" >> /tmp/info.tmp.01.$$$ 
    echo -e "--------------------------------------------------------------------" >> /tmp/info.tmp.01.$$$ 
    echo -e "Model: `cat /proc/ide/hda/model` " >> /tmp/info.tmp.01.$$$    
    echo -e "Driver: `cat /proc/ide/hda/driver` " >> /tmp/info.tmp.01.$$$    
    echo -e "Cache size: `cat /proc/ide/hda/cache` " >> /tmp/info.tmp.01.$$$    
fi
echo -e "--------------------------------------------------------------------" >> /tmp/info.tmp.01.$$$ 
echo -e "File System (Mount):" >> /tmp/info.tmp.01.$$$ 
echo -e "--------------------------------------------------------------------" >> /tmp/info.tmp.01.$$$ 
cat /proc/mounts >> /tmp/info.tmp.01.$$$

if which dialog > /dev/null
then
    dialog  --backtitle "Linux Software Diagnostics (LSD) Shell Script Ver.1.0" --title "Press Up/Down Keys to move" --textbox  /tmp/info.tmp.01.$$$ 21 70
else
    cat /tmp/info.tmp.01.$$$ |more
fi

rm -f /tmp/info.tmp.01.$$$

#

answer7

#!/bin/bash
#

# Algo:
#       1) Input number n
#       2) Set sum=0, sd=0
#    3) Find single digit in sd as n % 10 it will give (left most digit)
#       4) Construct sum no as sum=sum+sd
#       5) Decrment n by 1
#       6) Is n is greater than zero, if yes goto step 3, otherwise next step
#       7) Print sum
#
if [ $# -ne 1 ]
then
    echo "Usage: $0   number"
    echo "       I will find sum of all digit for given number"
    echo "       For eg. $0 123, I will print 6 as sum of all digit (1+2+3)"
    exit 1
fi

n=$1
sum=0
sd=0
while [ $n -gt 0 ]
do
    sd=`expr $n % 10`
    sum=`expr $sum + $sd`
    n=`expr $n / 10`
done
    echo  "Sum of digit for numner is $sum"

answer6

#!/bin/bash
#

# Script to reverse given no
#
# Algo:
#       1) Input number n
#       2) Set rev=0, sd=0
#    3) Find single digit in sd as n % 10 it will give (left most digit)
#       4) Construct revrse no as rev * 10 + sd
#       5) Decrment n by 1
#       6) Is n is greater than zero, if yes goto step 3, otherwise next step
#       7) Print rev
#
if [ $# -ne 1 ]
then
    echo "Usage: $0   number"
    echo "       I will find reverse of given number"
    echo "       For eg. $0 123, I will print 321"
    exit 1
fi

n=$1
rev=0
sd=0

while [ $n -gt 0 ]
do
    sd=`expr $n % 10`
    rev=`expr $rev \* 10  + $sd`
    n=`expr $n / 10`
done
    echo  "Reverse number is $rev"

#

answer5

#!/bin/bash
#

#
# Q5
#
echo "Hello, $LOGNAME"
echo "Current date is `date`"
echo "User is `who i am`"
echo "Current direcotry `pwd`"

#

#

answer4

#!/bin/bash
#

# Q4
#

if test $# = 3
then
 case $2 in
  +) let z=$1+$3;;
  -) let z=$1-$3;;
  /) let z=$1/$3;;
  x|X) let z=$1*$3;;
  *) echo Warning - $2 invalied operator, only +,-,x,/ operator allowed
     exit;;
 esac
 echo Answer is $z
else
 echo "Usage - $0   value1  operator value2"
 echo "        Where, value1 and value2 are numeric values"
 echo "               operator can be +,-,/,x (For Multiplication)"
fi


#

answer3

#!/bin/bash
#

# Q3
# Algo:
#       1) START: set value of i to 5 (since we want to start from 5, if you
#          want to start from other value put that value)
#       2) Start While Loop
#       3) Chechk, Is value of i is zero, If yes goto step 5 else
#          continue with next step
#       4) print i, decement i by 1 (i.e. i=i-1 to goto zero) and
#          goto step 3
#       5) END
#
i=5
while test $i != 0
do
 echo "$i
"
 i=`expr $i - 1`
done
#

Pages

Tuesday, 1 November 2011

ans21

answers10-19

answer7

answer6

answer5

answer4

answer3