I have to find files by size. Sizes are parameters. Result of found files must be saved to file. I already got this:

touch result.txt 
find /var/log -type f -size $1 -size $2 -exec ls {} \; > result.txt 

script shows me some results but I'm not sure they are right and nothing is saving to file.
Anybody can help?

  • 1
    Saving to file doesn't work with -exec. Use -ls instead. Also, a redirection will create a file if it doesn't exist yet, so the touch command is unnecessary.
    – Jos
    Nov 2, 2017 at 10:06
  • The size parameter has a couple of quirks that are described in man find. E.g. sizes are rounded up to the next unit (bytes, blocks, kb, Mb). Therefore, finding -1M would match only empty files. You would only use two parameters if you wanted to find files "less than $1" and "more than $2". Is that what you want?
    – Jos
    Nov 2, 2017 at 10:13
  • I want to find files which size i between these two parameters
    – J.Smith
    Nov 2, 2017 at 10:16

2 Answers 2


use like :

find /var/log -type f -size -10M -size +1M -exec ls {} \; > result.txt

It will store files name that have size more than 1Mb and less than 10Mb.

cat result.txt

If you pass as input parameters then use like:

find /var/log -type f -size -"$1"M -size +"$2"M -exec ls {} \; > result.txt

Below are the available units for size.

  -size n[cwbkMG]
          File uses n units of space, rounding up.  The following
          suffixes can be used:

          `b'    for 512-byte blocks (this is the default if no suffix
                 is used)

          `c'    for bytes

          `w'    for two-byte words

          `k'    for Kibibytes (KiB, units of 1024 bytes)

          `M'    for Mebibytes (MiB, units of 1024 * 1024 = 1048576

          `G'    for Gibibytes (GiB, units of 1024 * 1024 * 1024 =
                 1073741824 bytes)
  • find has an ls option, that should be much faster.
    – dessert
    Nov 2, 2017 at 10:23
  • a simple tweak to look for any sizes: findsize () { rem="param1: dir, param2:min, param3:max" ; find "$1" -type f -size -"$3" -size +"$2" -exec ls '{}' ';' > result.txt ;} and use like: findsize /var/log 1M 10M to find the same as your exemple. Nov 2, 2017 at 14:04

The files you find can be sorted numerically (using the size column) like this

find /var/log -ls |sort -nk7

You can store the result in a file if you wish

find /var/log -ls |sort -nk7 > result.txt

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