some sytem scripts

shell_scripts/lessons/TRICKS.md

@@ -50,4 +50,48 @@ Useful Cmds:
 List size of folders
 $ du -sh *
 
+Print calendar:
+$ cal
 
+Writing and creating a file:
+$ cat > NEWFILE
+
+--- write here ---
+^D
+
+
+De-bug Shell Script
+-------------------
+
+Use -v and -x option:
+$ sh option SCRIPT
+$ bash option SCRIPT
+
+
+Local and Global Variables
+-------------------------
+
+Whenever you type:
+$ /bin/bash
+You start a new shell where the previous variables will be forgotten (local variables). To make variables global, you can do:
+$ export VARIABLE-NAME
+Before changing shell.
+
+
+Conditional Execution
+---------------------
+
+The control operators are && (AND) and || (OR).
+$ rm myf && echo "File is removed successfully" || echo "File is not removed"
+
+
+Functions
+---------
+
+$ SayHello()
+{
+   echo "Hello $LOGNAME, Have nice computing"
+   return
+}
+To execute this SayHello() function just type it name as follows:
+$ SayHello

shell_scripts/lessons/average_number.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+#
+
+avg=0
+temp_total=0
+number_of_args=$#
+
+#
+# First see the sufficient cmd args
+#
+if [ $# -lt 2 ] ; then
+   echo -e "Opps! I need atleast 2 command line args\n"
+   echo -e "Syntax: $0: number1 number2 ... numberN\n"
+   echo -e "Example:$0 5 4\n\t$0 56 66 34"
+   exit 1
+fi
+
+#
+# now calculate the average of numbers given on command line as cmd args
+#
+
+for i in $*
+do
+
+   #  addition of all the numbers on cmd args
+   temp_total=`expr $temp_total + $i`
+
+done
+
+avg=`expr $temp_total / $number_of_args`
+echo "Average of all number is $avg"

shell_scripts/lessons/case_loop_example.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+
+# script to test case statement
+
+if [ -z $1 ]
+  then
+  r="*** unknown ***"
+elif [ -n $1 ]
+  then
+  r=$1
+fi
+
+case $r in
+  "car") echo "car rental";;
+  "van") echo "van rental";;
+  "jeep") echo "jeep rental";;
+  *) echo "Sorry I have no $r !";;
+esac

shell_scripts/lessons/cheesboard.sh

@@ -5,7 +5,7 @@ for (( i = 1; i <= 9; i++ ))
 do
   for (( j = 1; j <= 9; j++))
   do
-    tot=`expr $i + $j`
+    tot=`expr $i + $j` # notice that these tot must have no space to =
     tmp=`expr $tot % 2`
     if [ $tmp -eq 0 ]; then
       echo -e -n "\033[47m  "

shell_scripts/lessons/factorial.sh

@@ -0,0 +1,18 @@
+#! /bin/bash
+
+n=0
+on=0
+fact=1
+
+echo -n "Enter number to find factorial : "
+read n
+
+on=$n
+
+while [ $n -ge  1 ]
+do
+  fact=`expr $fact \* $n`
+  n=`expr $n - 1`
+done
+
+echo "Factorial for $on is $fact"

shell_scripts/lessons/file_descriptors.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+# from > & destination
+
+if [ $# -ne 2 ]
+  then
+  echo "Error!" 1>&2
+  echo "Usae: $0 number1 number2"
+  exit 1
+fi
+ans=`expr $1 + $2`
+echo "Sum = $ans"

shell_scripts/lessons/getopts.sh

@@ -0,0 +1,59 @@
+#!/bin/sh
+
+
+
+# Usage: ./geotopts.sh -n -a -s -w -d
+#
+#
+# help_ani() To print help
+#
+help_ani()
+{
+  echo "Usage: $0 -n -a -s -w -d"
+  echo "Options: These are optional argument"
+  echo " -n name of animal"
+  echo " -a age of animal"
+  echo " -s sex of animal "
+  echo " -w weight of animal"
+  echo " -d demo values (if any of the above options are used "
+  echo " their values are not taken)"
+  exit 1
+}
+#
+#Start main procedure
+#
+#
+#Set default value for variable
+#
+isdef=0
+na=Moti
+age="2 Months" # may be 60 days, as U like it!
+sex=Male
+weight=3Kg
+#
+#if no argument
+#
+if [ $# -lt 1 ]; then
+  help_ani
+fi
+while getopts n:a:s:w:d opt
+do
+  case "$opt" in
+    n) na="$OPTARG";;
+    a) age="$OPTARG";;
+    s) sex="$OPTARG";;
+    w) weight="$OPTARG";;
+    d) isdef=1;;
+    \?) help_ani;;
+  esac
+done
+if [ $isdef -eq 0 ]
+then
+  echo "Animal Name: $na, Age: $age, Sex: $sex, Weight: $weight (user define mode)"
+else
+  na="Pluto Dog"
+  age=3
+  sex=Male
+  weight=20kg
+  echo "Animal Name: $na, Age: $age, Sex: $sex, Weight: $weight (demo mode)"
+fi

shell_scripts/lessons/hex_converter_real_numbers.sh

@@ -0,0 +1,10 @@
+#! /bin/bash
+
+n=0
+hex=0
+echo "Decimal to hexadecimal converter:"
+echo -n "Enter number in decimal format : "
+read n
+hex=`echo "obase=16;ibase=10; $n" | bc`
+echo "$n is equivalent \"$hex\" in hexadecimal"
+

shell_scripts/lessons/menu_fancy.sh

@@ -0,0 +1,49 @@
+#!/bin/sh
+#
+#         dialog --title {title} --backtitle {backtitle} {Box options}
+#        where Box options can be any one of following
+#       --yesno      {text}  {height} {width}
+#       --msgbox     {text}  {height} {width}
+#       --infobox    {text}  {height} {width}
+#       --inputbox   {text}  {height} {width} [{init}]
+#       --textbox    {file}  {height} {width}
+#      --menu       {text}  {height} {width} {menu} {height} {tag1} item1}...
+#
+#
+
+dialog \
+--title "Hello $LOGNAME" \
+--backtitle "Linux Shell Script - Bytegirl Tutorial" \
+--msgbox "This is dialog box called infobox, which is used \
+to show some information on screen, Thanks to Savio Lam and\
+Stuart Herbert to give us this utility. Press any key. . . " \
+9 50 ; read
+
+
+
+dialog --title "Alert : Delete File" --backtitle "Linux Shell Script\
+Tutorial" --yesno "\nDo you want to delete '/usr/letters/jobapplication'\
+file" 7 60
+sel=$?
+case $sel in
+   0) echo "User select to delete file";;
+   1) echo "User select not to delete file";;
+   255) echo "Canceled by user by pressing [ESC] key";;
+esac
+
+
+
+$ cat > dia4
+dialog --title "Inputbox - To take input from you" --backtitle "Linux Shell\
+Script Tutorial" --inputbox "Enter your name please" 8 60 2>/tmp/input.$$
+
+sel=$?
+
+na=`cat /tmp/input.$$`
+case $sel in
+  0) echo "Hello $na" ;;
+  1) echo "Cancel is Press" ;;
+  255) echo "[ESCAPE] key pressed" ;;
+esac
+
+rm -f /tmp/input.$$

shell_scripts/lessons/real_numbers.sh

@@ -0,0 +1,26 @@
+#! /bin/bash
+
+
+a=0
+b=0
+number_of_args=$#
+
+#
+# First see the sufficient cmd args
+#
+if [ $# -lt 2 ] ; then
+   echo -e "Opps! I need atleast 2 command line args\n"
+   echo -e "Syntax: $0: number1 number2 ... numberN\n"
+   echo -e "Example:$0 5 4\n\t$0 56 66 34"
+   exit 1
+fi
+
+#
+# now calculate the average of numbers given on command line as cmd args
+#
+
+a=$1
+b=$2
+
+c=`echo $a + $b | bc`
+echo "$a + $b = $c"

shell_scripts/lessons/red_hello_world.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+
+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"

shell_scripts/lessons/while_loop_example.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+# script to test while statement
+
+if [ $# -eq 0 ] # note the spaces
+then
+  echo "Error, missing argument!"
+exit 1
+fi
+n=$1
+i=1
+while [ $i -le 10 ]
+do
+  echo "$n * $i = `expr $i \* $n`"
+  i=`expr $i + 1`
+done

shell_scripts/power_user_awk/AWK_TIPS.txt

@@ -0,0 +1,53 @@
+Data Manipulation
+-----------------
+
+
+Print elements in the column 3 that has the word "good" in the other columns
+$ awk '/good/ { print $3 }' inventory
+
+Syntax:
+$ awk -f {PROGRAM FILE} FILENAME
+
+awk program is:
+
+PATTERN{
+  ACTION 1
+  ACTION 2
+  ACTION 3
+}
+
+
+. (Dot) Match any character
+* Match zero or more character
+^ Match beginning of line
+$ Match end of line
+\ Escape character following
+[ ] List
+{ } Match range of instance
++ Match one more preceding
+? Match zero or one preceding
+| Separate choices to match
+
+
+
+IF CONDITION
+------------
+
+if (condition)
+{
+  Statement 1
+  Statement 2
+  Statement N
+  if condition  is TRUE
+}
+else
+{
+  Statement 1
+  Statement 2
+  Statement N
+  if condition is FALSE
+}
+
+
+FOR LOOP
+--------

shell_scripts/power_user_awk/TIPS.txt

@@ -0,0 +1,41 @@
+For files with many columns:
+===========================
+
+$ cut -f2 NAMEFILE  --> display the second column
+$ cut -f1 NAMEFILE  --> display first column
+$ paste FILE1 FILE2  --> join the columns together of two files
+$ join FILE1 FILES2  --> join separate files but only if there is common field in both files with identical values
+
+
+Changing the contend of files:
+==============================
+
+CHARACTERS:
+----------
+
+$ tr "h2" "3x" < FILENAME --> changes all h to 3 and all 2 to x
+
+
+WORDS:
+------
+$ sed expression file
+$ sed '/tea/s//milk/g' FILENAME
+
+/tea/ --> find tea word
+s//milk/ --> replace (substitute) the word milk for tea
+g --> make the changes globally
+
+
+DUPLICATES:
+-----------
+
+Print LINES that are unique.
+$ uniq FILENAME
+
+Duplicate lines must be next to next to each other, so it's better to sort first:
+$ sort FILENAME | uniq
+
+
+Ex
+--
+$ ex FILENAME --> start the editor

shell_scripts/power_user_awk/file_directory_example.awk

@@ -0,0 +1,21 @@
+# awk -f FILEAWK FILELIST
+
+BEGIN{
+}
+
+#
+# main logic is here
+#
+{
+    sfile = $1
+    dfile = $2
+    cpcmd = "cp " $1 " " $2
+    printf "Coping %s to %s\n",sfile,dfile
+    system(cpcmd)
+}
+
+#
+# End action, if any, e.g. clean ups
+#
+END{
+}

shell_scripts/power_user_awk/for_loop.awk

@@ -0,0 +1,12 @@
+# awk -f for_loop.awk
+
+BEGIN {
+   printf "To test for loop\n"
+   printf "Press CTRL + C to stop\n"
+ }
+ {
+  for(i=0;i<NF;i++)
+  {
+       printf "Welcome %s, %d times.\n" ,ENVIRON["USER"], i
+  }
+}

shell_scripts/power_user_awk/math1.awk

@@ -0,0 +1,8 @@
+
+# awk -f math1
+{
+no1 = $1
+no2 = $2
+ans = $1 + $2
+print no1 " + " no2 " = " ans
+}

shell_scripts/power_user_awk/math2.awk

@@ -0,0 +1,30 @@
+# awk -f math2
+
+BEGIN {
+  myprompt = "(To Stop press CTRL+D) > "
+  printf "Welcome to MyAddtion calculation awk program v0.1\n"
+  printf "%s" ,myprompt
+}
+
+{
+no1 = $1
+op = $2
+no2 = $3
+ans = 0
+
+if ( op == "+" )
+{
+     ans = $1 + $3
+     printf "%d %c %d = %d\n" ,no1,op,no2,ans
+     printf "%s" ,myprompt
+ }
+ else
+ {
+     printf "Opps!Error I only know how to add.\nSyntax: number1 + number2\n"
+     printf "%s" ,myprompt
+  }
+}
+
+END {
+    printf "\nGoodbye, %s\n !" , ENVIRON["USER"]
+}

shell_scripts/useful/bye.sh

@@ -0,0 +1,9 @@
+echo
+echo "Before leaving..."
+echo
+echo "Did you $ backup?"
+echo
+echo "Did you $ git everything?"
+echo
+echo "<3 Bye, $LOGNAME! <3"
+echo

shell_scripts/useful/find_if_file_exists.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+
+if [ $# -ne 1 ]
+then
+    echo "Usage - $0  file-name"
+    exit 1
+fi
+
+if [ -f $1 ]
+then
+    echo "$1 file exist"
+else
+    echo "Sorry, $1 file does not exist"
+fi

shell_scripts/useful/menu.sh

@@ -0,0 +1,30 @@
+#!/bin/sh
+
+
+# Script to create simple menus and take action according to that selected
+# menu item
+#
+while :
+ do
+    clear
+    echo "-------------------------------------"
+    echo " Main Menu "
+    echo "-------------------------------------"
+    echo "[1] Show Todays date/time"
+    echo "[2] Show files in current directory"
+    echo "[3] Show calendar"
+    echo "[4] Start editor to write letters"
+    echo "[5] Exit/Stop"
+    echo "======================="
+    echo -n "Enter your menu choice [1-5]: "
+    read yourch
+    case $yourch in
+      1) echo "Today is `date` , press a key. . ." ; read ;;
+      2) echo "Files in `pwd`" ; ls -l ; echo "Press a key. . ." ; read ;;
+      3) cal ; echo "Press a key. . ." ; read ;;
+      4) vi ;;
+      5) exit 0 ;;
+      *) echo "Opps!!! Please select choice 1,2,3,4, or 5";
+         echo "Press a key. . ." ; read ;;
+ esac
+done

shell_scripts/useful/red_hello_world.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+
+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"

shell_scripts/useful/system_info.sh

@@ -0,0 +1,61 @@
+#!/bin/bash
+
+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.$$$