How to find the size of a file and assign it to a variable in UNIX

Question

I am writing a UNIX script that reads the size of a text file and if the file is of some size it should print the text file. If it is not an else loop executes and the process c

Answer 1

You can use the stat command which eliminates the need to use awk.

For example in in linux with bash where myfile is your file path:

sz=$(stat -c '%s' myfile)
if [ $sz -eq 100 ]; then
    echo "myfile is 100 bytes"
fi

Take note of the equality command -eq that's the arithmetic binary operator in bash.

Alternatively you can use a variable for the file path:

f=my/file/path
sz=$(stat -c '%s' $f)
if [ $sz -eq 100 ]; then
    echo "$f is 100 bytes"
fi