Check file size in unix shell script

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Check file size in unix shell script

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Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Use curl to get only the response header using the -I option. In the response header look for Content-Length: which will be followed by the size of the file in bytes. Similar to codaddict's answerbut without the call to grep :. The preceding answers won't work when there are redirections.

For example, if one wants the size of the debian iso DVD, he must use the --location option, otherwise, the reported size may be that of the Moved Temporarily answer body, not that of the real file. Suppose you have the following url:. That's why I prefer using HEADwhich is an alias to the lwp-request command from the libwww-perl package on debian. I have a shell function, based on codaddict's answerwhich gives a remote file's size in a human-readable format thusly:.

I use like this [Cc]ontent-[Ll]ength:because I got server give multiple Content-Length character at header response.

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For automated purposes you'll just need to add the command to your script file. Learn more. How to get remote file size from a shell script?

Unix / Linux - Shell File Test Operators Example

Ask Question. Asked 9 years, 3 months ago. Active 1 year, 6 months ago. Viewed 41k times. How about wget --spider? Active Oldest Votes. You can download the file and get its size. But we can do better. Use cut -d' ' -f2 instead of awk.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

It only takes a minute to sign up. I have a script to check file size and to check that it exists but I don't know how to check at a particular time. To check if a file is present in a location you can use the -f test in an if statement. To get the script to run at a pre-defined time, put your code into an executable scipt and load it into a cronjob. I suspect you possibly could put your command into a one liner and load it into a crobtab?

I would be interested to know if anyone else has done this successfully But the problem with cron commands is that. Sign up to join this community. The best answers are voted up and rise to the top.

Home Questions Tags Users Unanswered. Check file is present and it is not empty Ask Question. Asked 3 years, 4 months ago. Active 1 month ago. Viewed 15k times. Gomsthyshankar Selvakumar Gomsthyshankar Selvakumar 65 1 1 gold badge 1 1 silver badge 7 7 bronze badges. This is pretty straight forward with test [. What have you tried? Active Oldest Votes. The time and date fields are: field allowed values minute hour day of month month or names, see below day of week 0 or 7 is Sun, or use names [ Sign up or log in Sign up using Google.

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Introduction to Linux - A Hands on Guide This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter. For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant.

They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own. Click Here to receive this Complete Guide absolutely free. Hi All, I am attempting to write a shell script to determine if a particular file has a size of zero or not.

This will work: Code:. Find More Posts by MicahCarrick. Find More Posts by pixellany. Originally Posted by MicahCarrick.

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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 continues.

check file size in unix shell script

How do I assign it to a variable inside the script and put it in an if condition? Take note of the equality command -eq that's the arithmetic binary operator in bash. Learn more. Asked 5 years, 7 months ago. Active 2 years, 3 months ago. Viewed 7k times. I am using the following command to find the size of that text file. Active Oldest Votes. You can use the stat command which eliminates the need to use awk.

Marc Butler Marc Butler 1, 7 7 silver badges 13 13 bronze badges. AbdulAshikKhanM if not, then the alternative is that the posted solution requires your file to be named myfile and exist in the directory you run the command from.

AbdulAshikKhanM yes you will be able to specify your own file name path. Needs more quotes. Here is a safer way to get the file size in a variable. If stat 1 is not available, I would rather prefer using perl or something similar over parsing ls -l output.

Neither stat nor perl are specified by POSIX and the question is tagged unixthat's the reason why I stick with standard tools and options. While I agree parsing ls output is generally a bad idea, I believe I took enough precautions to avoid any risk in that specific case.

CharlesDuffy I' didn't wrote the odds are high, just they do exist. Neither stat nor perl are. Anirban Pal Anirban Pal 4 4 silver badges 9 9 bronze badges.

No, don't parse the output of ls. Use stat instead. Paras Singh Paras Singh 1 1 gold badge 1 1 silver badge 9 9 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook.

Unix / Linux - Shell File Test Operators Example

Sign up using Email and Password. Post as a guest Name.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I'm looking for ways to have an automated process that checks the size of a flat file in a particular location if it is zero or otherwise. Currently, I am doing it manually by going to the location and to check it.

This is tedious work since I'm doing this from time to time. Could someone guide me from here? It could be a shell script in a server that when I run, it will send an email to myself and others. Learn more. Asked 4 years, 6 months ago.

Active 4 years, 6 months ago. Viewed 1k times. Hoping for your kind response. All I see here are batch files which is not applicable to me. Keiji Keiji 17 7 7 bronze badges. Active Oldest Votes. You could use something like this:! Hi, with regards to the script, can you let me know where is the conditional statement? Seems like the script didn't return any subject nor email content.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

It only takes a minute to sign up. The problem with using stat is that it is a GNU Linux extension. Solaris, for example, ships with bash but not with stat. So this is not entirely hypothetical. Stick to portable constructs where possible, and you will make somebody's life easier in the future.

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Maybe your own. The problem with wc is that it'll add the filename and indent the output. For example:. If you would like to avoid chaining a full interpreted language or stream editor just to get a file size count, just redirect the input from the file so that wc never sees the filename:.

This last form can be used with command substitution to easily grab the value you were seeking as a shell variable, as mentioned by Gilles below. BSD's macOS's stat has a different format argument flag, and different field specifiers.

Find by File Size in BASH

From man stat 1 :. IOW, it's the size of the content of the file. It will however read the contents of the file except if the file is a regular file or symlink to regular file in most wc implementations as an optimisation. That may have side effects. That also means you need read permission to the file, and the last access timestamp of the file may be updated.

That's standard and portable, however note that some wc implementations may include leading blanks in that output. One way to get rid of them is to use:.

Various systems have a command called stat that's an interface to the stat or lstat system calls. Those report information found in the inode.

For regular files, that's the size of the content how much data could be read from it in the absence of error that's what most wc -c implementations use in their optimisation. For symlinks, that's the size in bytes of the target path. For named pipes, depending on the system, it's either 0 or the number of bytes currently in the pipe buffer.

Same for block devices where depending on the system, you get 0 or the size in bytes of the underlying storage. You don't need read permission to the file to get that information, only search permission to the directory it is linked to. IRIX stat 90's :.

check file size in unix shell script

BSDs stat :. AIX also has an istat command which will dump all the stat not lstatso won't work on symlinks information and which you could post-process with, for example:.

Long before GNU introduced its stat command, the same could be achieved with GNU find command with its -printf predicate already in :. That doesn't work for device files though where the 5 th field is the device major number instead of the size. However, you need read permission to the device file for that.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

It only takes a minute to sign up. You probably want to pay closer attention to column 4 avail than to the percentage in column 5. It sounds like your script knows about ancient log files that are "safe" to prune. For a given pruning operation, that set of files will be on exactly one filesystem. It makes no sense to parse systemwide df output when you really care about this:.

That gives a numeric report in KBytes rather than with human readable text suffixes on exactly the quantity you care about, free space for current directory's filesystem. You can write a while loop around that, perhaps pruning a single file, the oldest file, each time through the loop.

Include a sanity check before beginning the loop: ensure that du -k says that you could free "enough" space if needed. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered.

Script to check for file system usage and clear space [closed] Ask Question. Asked 2 years, 7 months ago. Active 2 years, 7 months ago.

check file size in unix shell script

Viewed 3k times. Rebbeca Rebbeca 77 2 2 silver badges 7 7 bronze badges. How would a script know which files to safely delete? If root fills up, should it delete kernel? What if you're keeping them for some reason? Kernel source-- ditto?

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Core dumps -- ditto! Active Oldest Votes. You posted df -h output, which is human readable, but not good for scripts. The Overflow Blog.

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