However, you need read permission to the device file for that. It's usually possible to derive the size by other means. For instance still on Linux :. An approach that works for all seekable files so includes regular files, most block devices and some character devices is to open the file and seek to the end:. However note that while it doesn't read the content of the pipe, the mere opening of the named pipe here can still have side effects.
We're using fuser to check first that some process already has the pipe open to alleviate that but that's not foolproof as fuser may not be able to check all processes. Now, so far we've only been considering the size of the primary data associated with the files. That doesn't take into account the size of the metadata and all the supporting infrastructure needed to store that file.
That doesn't include the inode itself, or the entries in the directories the file is linked to. Size and disk usage are not necessarily tightly related as compression, sparseness sometimes some metadata , extra infrastructure like indirect blocks in some filesystems have an influence on the latter. That's typically what du uses to report disk usage.
Most of the commands listed above will be able to get you that information. The file size shows the number of bytes. It is the apparent size, which is the bytes the file uses on a typical disk, without special compression, or special sparse areas, or unallocated blocks, etc. The file size in the fifth column, and is displayed in bytes.
In the example below, the filesize is just under 2KB:. I found an AWK 1 liner, and it had a bug but I fixed it. I also added in PetaBytes after TeraBytes. Considering stat is not on every single system, you can almost always use the AWK solution. Example; the Raspberry Pi does not have stat but it does have awk. I like the wc option myself. Paired with 'bc,' you can get decimals to as many places as you please.
I was looking to improve a script I had that awk'ed out the 'file size' column of an 'ls -alh' command. I didn't want just integer file sizes, and two decimals seemed to suit, so after reading this discussion, I came up with the code below.
My script is called gpfl , for "get picture file length. I don't know how this rates as an "answer," as it borrows much from what's already been offered and discussed. So I'll leave it there. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. How can I get the size of a file in a bash script?
HI, Can any tell me how to filter the list of files greater than the size specified by user. The size should be provided by user as an input. Regards shiva 6 Replies. Can I find wether a particular file exist and size greater than zero Can I find wether a particular file exist and size greater than zero in one line command. I mean if both are RedHat Commands. OpenSolaris Commands.
Linux Commands. SunOS Commands. FreeBSD Commands. Full Man Repository. Advanced Search. Related Articles. Table of Contents. Improve Article. Save Article. Like Article. Last Updated : 02 Jul, FIle size with filename. Printing file size. Case statement is used as the alternative of if-elseif-else statement. The output of the following script will be same to the previous else if example. Bash script can read input from command line argument like other programming language.
Two argument values read by the following script and prints the total number of arguments and the argument values as output. How you can read command line arguments with names is shown in the following script. Here, two arguments, X and Y are read by this script and print the sum of X and Y. You can easily combine string variables in bash. Like other programming language, bash has no built-in function to cut value from any string data. But you can do the task of substring in another way in bash that is shown in the following script.
Here, the value, 6 indicates the starting point from where the substring will start and 5 indicates the length of the substring. You can do the arithmetical operations in bash in different ways.
How you can add two integer numbers in bash using double brackets is shown in the following script. Two integer values will be taken from the user and printed the result of addition. How you can create a simple function and call the function is shown in the following script.
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