By using ls -lh we can get the file size.
Is there any way I can check if the file size is greater than 1MB to then print a message like below? I may have files with different sizes like 100mb, 1gb, 10gb, 100kb.
if [ $FileSize > 1MB ]; then echo "File size is grater than 1MB" fi Is there a way I can check the file size using an if statement?
Using find on a specific file at $filepath:
if [ -n "$(find "$filepath" -prune -size +1000000c)" ]; then printf '%s is strictly larger than 1 MB\n' "$filepath" fi This uses find to query the specific file at $filepath for its size. If the size is greater than 1000000 bytes, find will print the pathname of the file, otherwise it will generate nothing. The -n test is true if the string has non-zero length, which in this case means that find outputted something, which in turns means that the file is larger than 1 MB.
You didn't ask about this: Finding all regular files that are larger than 1 MB under some $dirpath and printing a short message for each:
find "$dirpath" -type f -size +1000000c \ -exec printf '%s is larger than 1 MB\n' {} + These pieces of code ought be to portable to any Unix.
Note also that using < or > in a test will test whether the two involved strings sort in a particular way lexicographically. These operators do not do numeric comparisons. For that, use -lt ("less than"), -le ("less than or equal to"), -gt ("greater than"), or -ge ("greater than or equal to"), -eq ("equal to"), or -ne ("not equal to"). These operators do integer comparisons.
find. GNU find may well understand -size +1M, as would find on e.g. macOS (but 1M actually means 1 MiB with these implementations, i.e. units of powers of 2 bytes rather than of powers of 10 bytes). If you want to query one single file at a time, stat is a general-purpose tool for querying various attributes of a particular file, including size among many others.
FileName="foo" FSize=1048576 if [ $(stat -f %z "$FileName") -gt $FSize ]; then printf "File %s is larger than %d bytes.\n" "$FileName" $FSize fi If what you're really looking for is a way to query a large number of files, and pull out the names of only those files which are over a certain size, then find may be what you want.
Given a group of files located in DIRECTORY, this will find those files larger than FSize bytes:
DIRECTORY="/path/to/your/files" FSize="1M" find $DIRECTORY -type f -size +$FSize 
stat -f %z? on my system it is stat -c %s for filesize in bytes