Bash file size zero

Sometimes, you want to start over by emptying the file especially if you are trying to minimize disk space. This is especially true about log files, which often contains a large amount of outdated data. This is not just relegated to log files, but could also happen to output files or any other file as well.

The truncation process basically removes all the contents of the file. It does not however remove the file itself, but it leaves it on the disk as a zero byte file. This allows the file to re-used or be continually used by other programs while keeping the overall size in check. You can always delete the file and recreate the file, which might work in most cases. The truncation process however reduces the need for the two different steps and also will preserve the inode of the file. We will only deal with the case where you want to completely empty the file or zero it out and not the case where you might want to remove parts of the file or truncate files by certain number of lines or byte size.

It is used to shrink the size of a file to a desired size. Greg Moeller Posted December 30, 0 Comments. Charles Grady Posted December 30, 0 Comments. Smithzoneon Posted December 30, 0 Comments. John Hodson Posted December 30, 0 Comments. Shafiullah Ahmadzai Posted December 31, 0 Comments. Gokilan Posted January 1, 0 Comments. Anonymous Posted January 7, 0 Comments. Anonymous Posted January 8, 0 Comments. Warwick Brown Posted January 8, 0 Comments. How to revert back after making it Zero size.

Romeo Ninov Posted February 16, 0 Comments. Normally you cant. Regards: Romeo Ninov From: venkatagirigowda via solaris-l [mailto:solaris-l Groups. Anonymous Posted February 16, 0 Comments. Warwick Brown Posted February 16, 0 Comments. Regards, Warwick. Abhilash Raman Posted February 16, 0 Comments. Smithzoneon Posted February 16, 0 Comments. Next time : cp filename filename. Anup dubey Posted February 16, 0 Comments. Tanongkiete Auponno Posted February 18, 0 Comments.

Romeo Ninov Posted February 18, 0 Comments. K Thanks Romeo and others. Smithzoneon Posted February 18, 0 Comments. Make since? Eddie …. Register or Login. Welcome back! This will output file. To execute a script script if file. For getting the file size in both Linux and Mac OS X and presumably other BSDs , there are not many options, and most of the ones suggested here will only work on one system.

And of course, regarding the rest of your original question, use the -lt or -gt operator :. I have tested this on Linux. From find 1 ,. I would use du 's --threshold for this. Not sure if this option is available in all versions of du but it is implemented in GNU's version.

Quoting from du 1 's manual:. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. How to check size of a file using Bash?

Ask Question. Asked 10 years, 8 months ago. Active 2 years, 2 months ago. Viewed k times. What I'm currently using.. Improve this question. Add a comment. Active Oldest Votes. If you want to say "size is non-zero", you need [ -s file.

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