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i am just wondering what does this piece of code do, what language is it and what meaning it has     if [ -e /tmp/filename ]; then   file=$(cat /tmp/filename)   if [[ "$file" =~ ^/home/[a-zA-Z0-9]+/[a-zA-Z0-9]+\.?[a-zA-Z0-9]*$ ]]; then     if [ -e "${file}" ]; then       cp "${file}" /tmp       chmod 666 /tmp/${file##*/}       rm /tmp/filename     fi   fi fi

i am just wondering what does this piece of code do, what language is it and what meaning it has     if [ -e /tmp/filename ]; then   file=$(cat /tmp/filename)   if [[ "$file" =~ ^/home/[a-zA-Z0-9]+/[a-zA-Z0-9]+\.?[a-zA-Z0-9]*$ ]]; then     if [ -e "${file}" ]; then       cp "${file}" /tmp       chmod 666 /tmp/${file##*/}       rm /tmp/filename     fi   fi fi

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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i am just wondering what does this piece of code do, what language is it and what meaning it has

 

 

if [ -e /tmp/filename ]; then
  file=$(cat /tmp/filename)
  if [[ "$file" =~ ^/home/[a-zA-Z0-9]+/[a-zA-Z0-9]+\.?[a-zA-Z0-9]*$ ]]; then
    if [ -e "${file}" ]; then
      cp "${file}" /tmp
      chmod 666 /tmp/${file##*/}
      rm /tmp/filename
    fi
  fi
fi

 

 

 

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