Verify if a file was created shell

Question

I have to write a shell script that will monitor some folders given in the command and give a message if a certain file will be created inside them (the name of the file will be read from keyboard).

Can anyone tell me why is this not working?

#!/bin/sh
f=`read filename`
isIn=0
for dir in $*
do
    if [ ! -d $dir ]
    then
        echo $dir is not a directory.
    fi
    for i in `find $dir -type f`
    do
        if [ $f=$i ]
        then
            echo The file $f already exists.
            isIn=1
            break
        fi
    done
    if [ $isIn -eq 0 ]
    then
        sleep 20
        isIn=0
        for i in `find $dir -type f`
        do
            if [ $f=$i ]
            then
                echo The file was created\!
                isIn=1
                break
            fi
        done
    fi
    if [ $isIn -eq 0 ]
    then
        echo The file was not created\!
    fi
done

The idea i used was that i take all the files from the directory and verify is the file isn't already there. If it is - show message and move to the next directory. If not then I 'wait'. if in the time i waited that certain file was created, it would have appeared in the list of all files, and i check for it.

My problem is that no matter what file I read from the keyboard, i would get the message "The file already exists." without telling me the name of the file.

Answer 1

1. Replace f=`read filename` with the correct usage read f or read -p filename: f .

2. find $dir -type f prints the full file name including the directory path. Since you want just the basename, replace both lines

     for i in `find $dir -type f` 

   with

     for i in `find $dir -type f -printf '%f\\n'` 

3. Each operator and operand in [ ] must be a separate argument. Thus replace both lines

     if [ $f=$i ] 

   with

     if [ "$f" = $i ]