Makefile-tutorial/shell/filetest.sh

#!/bin/bash

#for provided file print the summary of what permissions users has granted
#example:   ./filetest.sh hello.txt
#READ:      YES
#WRITE:     NO
#EXECUTABLE:NO

#argument check

if [ $# -ne 1 ]; then
    echo "Provide exactly one argument"
    exit 1
fi

#variable assignment
FILE=$1

#check if the file exists 
if [ -f $FILE ]; then

    #default variables
    VAR_READ="NO"
    VAR_WRITE="NO"
    VAR_EXEC="NO"

    #check if file is readable
    if [ -r $FILE ]; then
        VAR_READ="YES"
    fi

    #check if file is writable
    if [ -w $FILE ]; then
        VAR_WRITE="YES"
    fi

    #check if file is executable
    if [ -x $FILE ]; then
        VAR_EXEC="YES"
    fi

    #write permissions summary to user
    echo "==FILE:   $FILE=="
    echo "READ:         $VAR_READ"
    echo "WRITE:        $VAR_WRITE"
    echo "EXECUTABLE:   $VAR_EXEC"
else
    echo $FILE does not exists
fi