Finding a file with a fixed file size (> 0) on Unix / Linux
I have a list of files that looks like
4 -rw-r--r-- 1 neversaint hgc0746 53 May 1 10:37 SRX016372-SRR037477.est_count
4 -rw-r--r-- 1 neversaint hgc0746 53 May 1 10:34 SRX016372-SRR037478.est_count
4 -rw-r--r-- 1 neversaint hgc0746 53 May 1 10:41 SRX016372-SRR037479.est_count
0 -rw-r--r-- 1 neversaint hgc0746 0 Apr 27 11:16 SRX003838-SRR015096.est_count
0 -rw-r--r-- 1 neversaint hgc0746 0 Apr 27 11:32 SRX004765-SRR016565.est_count
What I want to do is find files with the exact size 53
. But why did this command fail?
$ find . -name "*.est_count" -size 53 -print
This works well, although if I just want to find a file with size 0 with this command:
$ find . -name "*.est_count" -size 0 -print
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3 answers
You need to suffix size 53 with 'c'. How to find the manpage -
-size n[cwbkMG]
File uses n units of space. 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 Kilobytes (units of 1024 bytes)
`M' for Megabytes (units of 1048576 bytes)
`G' for Gigabytes (units of 1073741824 bytes)
The size does not count indirect blocks, but it does count
blocks in sparse files that are not actually allocated. Bear in
mind that the `%k' and `%b' format specifiers of -printf handle
sparse files differently. The `b' suffix always denotes
512-byte blocks and never 1 Kilobyte blocks, which is different
to the behaviour of -ls.
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-size n[ckMGTP]
True if the file size, rounded up, in 512-byte blocks is n. If
n is followed by a c, then the primary is true if the file size
is n bytes (characters). Similarly if n is followed by a scale
indicator then the file size is compared to n scaled as:
k kilobytes (1024 bytes)
M megabytes (1024 kilobytes)
G gigabytes (1024 megabytes)
T terabytes (1024 gigabytes)
P petabytes (1024 terabytes)
You need to use -size 53c.
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