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Limiting output file size

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# 1  
Old 04-12-2010
Limiting output file size
Hi guys,
I want to know if there is a way to check the current size of the file that I output "stuff" to. For example, if I run a command that outputs data (like another shell script or C program) and i do something like
`./a.out &> tempfile.txt` within the script,
I want to be constantly updated about the size of tempfile.txt. I was wondering if there were any shell tools that would allow me to do such a thing, also, if there was a kill command for the ./a.out program that would stop execution after a certain output file size.
# 2  
Old 04-12-2010
check out the setrlimit() system call. http://linux.die.net/man/2/setrlimit for linux. Based on your username, solaris also supports setrlimit()

Use the RLIMIT_FSIZE parameter.
Last edited by jim mcnamara; 04-12-2010 at 10:58 PM.. Reason: bad url
# 3  
Old 04-12-2010
Try using the dd utility. You can set a maximum size, and you can send an INFO signal to it to get the file size. From the man page...
Code:
   Sending an `INFO' signal to a running `dd' process makes it print
I/O statistics to standard error and then resume copying.  In the
example below, `dd' is run in the background to copy 10 million blocks.
The `kill' command makes it output intermediate I/O statistics, and
when `dd' completes, it outputs the final statistics.

     $ dd if=/dev/zero of=/dev/null count=10MB & pid=$!
     $ kill -s INFO $pid; wait $pid
     3385223+0 records in
     3385223+0 records out
     1733234176 bytes (1.7 GB) copied, 6.42173 seconds, 270 MB/s
     10000000+0 records in
     10000000+0 records out
     5120000000 bytes (5.1 GB) copied, 18.913 seconds, 271 MB/s

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