file_test_operators.md

#!/bin/bash 
  
#reading data from the user 
read -p 'Enter file name : ' FileName 
  
if [ -e $FileName ] 
then 
    echo File Exist 
else
    echo File doesnot exist 
fi 
  
if [ -s $FileName ] 
then 
    echo The given file is not empty. 
else
    echo The given file is empty. 
fi 
  
if [ -r $FileName ] 
then 
    echo The given file has read access. 
else
    echo The given file does not has read access. 
fi 
  
if [ -w $FileName ] 
then 
    echo The given file has write access. 
else
    echo The given file does not has write access. 
fi
  
if [ -e $FileName ] 
then 
    echo The given file has execute access. 
else
    echo The given file does not has execute access. 
fi

shell_scripting_notes.md

#!/bin/bash

# Call this script with at least 10 parameters, for example
# ./scriptname 1 2 3 4 5 6 7 8 9 10
MINPARAMS=10

echo

echo "The name of this script is \"$0\"."
# Adds ./ for current directory
echo "The name of this script is \"`basename $0`\"."
# Strips out path name info (see 'basename')

echo

if [ -n "$1" ]              # Tested variable is quoted.
then
 echo "Parameter #1 is $1"  # Need quotes to escape #
fi 

if [ -n "$2" ]
then
 echo "Parameter #2 is $2"
fi 

if [ -n "$3" ]
then
 echo "Parameter #3 is $3"
fi 

# ...


if [ -n "${10}" ]  # Parameters > $9 must be enclosed in {brackets}.
then
 echo "Parameter #10 is ${10}"
fi 

echo "-----------------------------------"
echo "All the command-line parameters are: "$*""

if [ $# -lt "$MINPARAMS" ]
then
  echo
  echo "This script needs at least $MINPARAMS command-line arguments!"
fi  

echo

exit 0