06-20-2007
max file size in unix
The max file size in unix is determined by the ulimit option. The ulimit stands for user limit which specifies the largest file that can be created by the user.
$ulimit
2097152
means that the max size of a file that can be created is 2097152 bytes or 2048 KB.
We can also reset the ulimit value
$ulimit=1 specifies that the user limit is now 512 bytes(1 refers to 512 block) and is only active for this session.
A normal user can decrease the ulimit value but only the superuser(root) has the permissions to increase this value.
Hope this clears your doubt. Thank you.
Suresh.
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LEARN ABOUT MOJAVE
ulimit
ULIMIT(3) BSD Library Functions Manual ULIMIT(3)
NAME
ulimit -- get and set process limits
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ulimit.h>
long
ulimit(int cmd, ...);
DESCRIPTION
The ulimit() function will get and set process limits. Currently, this is limited to the maximum file size. The cmd argument is one of the
following:
UL_GETFSIZE will return the maximum file size of the current process, in units of 512-byte blocks.
UL_SETFSIZE will attempt to set the maximum file size of the current process and its children, using the second argument (expressed as a
long).
RETURN VALUES
Upon successful completion, ulimit() returns the value requested; otherwise, the value -1 is returned and the global variable errno is set to
indicate the error.
ERRORS
The ulimit() function will fail if:
[EINVAL] The command specified was invalid.
[EPERM] The limit specified to ulimit() would have raised the maximum limit value, and the caller is not the super-user.
SEE ALSO
getrlimit(2)
STANDARDS
The ulimit() function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').
HISTORY
The ulimit() function first appeared in FreeBSD 5.0.
BUGS
The ulimit() function provides limited precision for setting and retrieving process limits. If there is a need for greater precision than
the type long provides, the getrlimit(2) and setrlimit(2) functions should be considered.
BSD
January 4, 2003 BSD