Bash script convert "string" to number

Question

i need to change a string to interger, because i check the size of file (extract with : stat -c%s $filename) with a number, follow the complete script :

#!/bin/bash

# Variable that contain path destination file
path=/sobstitude

# Variable for size
size=1000

# Loop for file scan
for filename in /test/*;
do
    # Take the size of file
    filesize=$(stat -c%s $filename)

# Check if the file is empty
if [ $filesize > $size ]
then

    # Replace file
    mv $filename $path

fi
done

exit 0;

Solution 1

Guys i've solved after change this :

if ((filesize > size))

Now work, thanks for support

Solution 2

In bash/sh variables contain strings, there is no strict concept of integers. A string may look like an integer and it's enough.

stat -c%s $filename should return a string that looks like an integer.

In your case the main problem is in the redirection operator > (you probably now have files with names that are numbers in the working directory). This snippet:

[ $filesize > $size ]

should be

[ "$filesize" -gt "$size" ]

And use double quotes around variable substitutions and command substitutions.

Solution 3

No need to "convert" data types. You can use -gt or -lt to compare numbers:

➜ size="$(stat -c%s test.mp4)"; [[ "$size" -gt 4000 ]] && echo "bigger" || echo "smaller"
bigger

➜ size="$(stat -c%s test.mp4)"; [[ "$size" -gt 400000 ]] && echo "bigger" || echo "smaller"
smaller

The > is not wrong in principle. You can use arithmetic expressions to perform the comparison.

I've used [[ in place of [ for its extended features.

Note that all variable expansions should be double-quoted. Particularly with $filename and $path, if any of those contain whitespace, your script will fail.

Comments

[xenoid]

Instead of checking the file size in the script, you can use find with -size to only list files that are in the adequate size bracket, and since you can tell find to execute a command against matching files, your whole script becomes find /test/ -maxdepth 1 -type f -size +1000c -exec mv {} /sobstitude \;