UNIX CODE (Korn Shell):

General TIPS:
  o Unix IS "case SeNsItIvE".
  o The GRAVE symbol (`) is USUALLY on the same key as the TILDE (~).
  o BRACES   refer to { and }.
  o BRACKETS refer to [ and ].
  o SEMICOLON (;) allows MULTIPLE commands on ONE line.
  o POUND (#) says "comments follow"'
    o Use #d# for Self Documenting using   grep "#d#" filespec
  o Run via    ksh filespec optional_parameter(s)
    o There can be up to 9 parameters (0 is the filespec)
  o If you are manipulating items with \ involved such as dos type directories,
    o use  "read -r"  in place of "read"  ("-r" meand Raw data)
    o use  "print -r" in place of "echo"  ("-r" meand Raw data)
  o String comparisons use "=", "!="
  o Numerical comparisons use -eq -ne -gt -lt -ge

# Seeing if ANY parameters were passed
 IZP1=$1                         # $1 is reserved for first parameter
 if [ "$IZP1" != "" ] ; then     # the "!=" means NOT EQUAL; use -ne for numerics
   echo "Parameters WERE passed"
 else
   echo "NO passed parameters"
 fi



# READING AN EXISTING FILE
  BOOK=/usr/randy/sample.txt     # BOOK is a SYMBOL for /usr/randy/sample.txt
  ICT=0 ; LCT=1                  # ";" continues (these COULD be on separate lines)
  NOL=`wc -l $BOOK`              # the ` is the GRAVE symbol
  until [ $LCT = $NOL ]          # UNTIL line counter LCT same as Number of lines NOL
  do                             # DO the following
    ((ICT=$ICT+1))               #   NO SPACES; steps up ICT by 1
    LIN=`sed -n ${LCT}p $BOOK`   #   read line #LCT into LIN  note: graves and braces {}     
         # Put HERE what to DO with the LINE symbol $LIN
         # ie: if the line were "This is obviously a test", to get the
         #     the THIRD word delimited by a space, enter:
         #     WORD3=`echo $LIN | cut -d" " -f3`
    ((LCT=$LCT+1))               #   NO SPACES; steps up LCT by 1
  done



# Getting user input into symbol named "$VAL"
                                 
  echo "::: Enter a value: \c"   # the "\c" keeps the cursor on SAME line as the query
  read VAL                       # I like to keep the "read" on SAME line as "\c"



# Creating a NEW file
  NUFIL=/usr/randy/nuexample.txt
  echo "This is LINE number ONE"          >$NUFIL   # Creates NEW (exists OR not)
  echo "NOW add SECOND line"             >>$NUFIL   # Add to file



# Extracting value from Environment (see what value for "editor")
  WHATIS=`alias | grep -i editor`   # The "-i" ignores case of "editor"
  echo "Value found is ($WHATIS)"   # output to screen