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ulimit.1p (4901B)

    

  1. '\" et
  2. .TH ULIMIT "1P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
  3. .\"
  4. .SH PROLOG
  5. This manual page is part of the POSIX Programmer's Manual.
  6. The Linux implementation of this interface may differ (consult
  7. the corresponding Linux manual page for details of Linux behavior),
  8. or the interface may not be implemented on Linux.
  9. .\"
  10. .SH NAME
  11. ulimit
  12. \(em set or report file size limit
  13. .SH SYNOPSIS
  14. .LP
  15. .nf
  16. ulimit \fB[\fR-f\fB] [\fIblocks\fB]\fR
  17. .fi
  18. .SH DESCRIPTION
  19. The
  20. .IR ulimit
  21. utility shall set or report the file-size writing limit imposed on
  22. files written by the shell and its child processes (files of any size
  23. may be read). Only a process with appropriate privileges can increase
  24. the limit.
  25. .SH OPTIONS
  26. The
  27. .IR ulimit
  28. utility shall conform to the Base Definitions volume of POSIX.1\(hy2017,
  29. .IR "Section 12.2" ", " "Utility Syntax Guidelines".
  30. .P
  31. The following option shall be supported:
  32. .IP "\fB\-f\fP" 10
  33. Set (or report, if no
  34. .IR blocks
  35. operand is present), the file size limit in blocks. The
  36. .BR \-f
  37. option shall also be the default case.
  38. .SH OPERANDS
  39. The following operand shall be supported:
  40. .IP "\fIblocks\fR" 10
  41. The number of 512-byte blocks to use as the new file size limit.
  42. .SH STDIN
  43. Not used.
  44. .SH "INPUT FILES"
  45. None.
  46. .SH "ENVIRONMENT VARIABLES"
  47. The following environment variables shall affect the execution of
  48. .IR ulimit :
  49. .IP "\fILANG\fP" 10
  50. Provide a default value for the internationalization variables that are
  51. unset or null. (See the Base Definitions volume of POSIX.1\(hy2017,
  52. .IR "Section 8.2" ", " "Internationalization Variables"
  53. for the precedence of internationalization variables used to determine
  54. the values of locale categories.)
  55. .IP "\fILC_ALL\fP" 10
  56. If set to a non-empty string value, override the values of all the
  57. other internationalization variables.
  58. .IP "\fILC_CTYPE\fP" 10
  59. Determine the locale for the interpretation of sequences of bytes of
  60. text data as characters (for example, single-byte as opposed to
  61. multi-byte characters in arguments).
  62. .IP "\fILC_MESSAGES\fP" 10
  63. .br
  64. Determine the locale that should be used to affect the format and
  65. contents of diagnostic messages written to standard error.
  66. .IP "\fINLSPATH\fP" 10
  67. Determine the location of message catalogs for the processing of
  68. .IR LC_MESSAGES .
  69. .SH "ASYNCHRONOUS EVENTS"
  70. Default.
  71. .SH STDOUT
  72. The standard output shall be used when no
  73. .IR blocks
  74. operand is present. If the current number of blocks is limited, the
  75. number of blocks in the current limit shall be written in the following
  76. format:
  77. .sp
  78. .RS 4
  79. .nf
  81. "%d\en", <\fInumber of 512-byte blocks\fR>
  82. .fi
  83. .P
  84. .RE
  85. .P
  86. If there is no current limit on the number of blocks, in the POSIX
  87. locale the following format shall be used:
  88. .sp
  89. .RS 4
  90. .nf
  92. "unlimited\en"
  93. .fi
  94. .P
  95. .RE
  96. .SH STDERR
  97. The standard error shall be used only for diagnostic messages.
  98. .SH "OUTPUT FILES"
  99. None.
  100. .SH "EXTENDED DESCRIPTION"
  101. None.
  102. .SH "EXIT STATUS"
  103. The following exit values shall be returned:
  104. .IP "\00" 6
  105. Successful completion.
  106. .IP >0 6
  107. A request for a higher limit was rejected or an error occurred.
  108. .SH "CONSEQUENCES OF ERRORS"
  109. Default.
  110. .LP
  111. .IR "The following sections are informative."
  112. .SH "APPLICATION USAGE"
  113. Since
  114. .IR ulimit
  115. affects the current shell execution environment, it is always provided
  116. as a shell regular built-in. If it is called in a separate utility
  117. execution environment, such as one of the following:
  118. .sp
  119. .RS 4
  120. .nf
  122. nohup ulimit -f 10000
  123. env ulimit 10000
  124. .fi
  125. .P
  126. .RE
  127. .P
  128. it does not affect the file size limit of the caller's environment.
  129. .P
  130. Once a limit has been decreased by a process, it cannot be increased
  131. (unless appropriate privileges are involved), even back to the original
  132. system limit.
  133. .SH EXAMPLES
  134. Set the file size limit to 51\|200 bytes:
  135. .sp
  136. .RS 4
  137. .nf
  139. ulimit -f 100
  140. .fi
  141. .P
  142. .RE
  143. .SH RATIONALE
  144. None.
  145. .SH "FUTURE DIRECTIONS"
  146. None.
  147. .SH "SEE ALSO"
  148. The Base Definitions volume of POSIX.1\(hy2017,
  149. .IR "Chapter 8" ", " "Environment Variables",
  150. .IR "Section 12.2" ", " "Utility Syntax Guidelines"
  151. .P
  152. The System Interfaces volume of POSIX.1\(hy2017,
  153. .IR "\fIulimit\fR\^(\|)"
  154. .\"
  155. .SH COPYRIGHT
  156. Portions of this text are reprinted and reproduced in electronic form
  157. from IEEE Std 1003.1-2017, Standard for Information Technology
  158. -- Portable Operating System Interface (POSIX), The Open Group Base
  159. Specifications Issue 7, 2018 Edition,
  160. Copyright (C) 2018 by the Institute of
  161. Electrical and Electronics Engineers, Inc and The Open Group.
  162. In the event of any discrepancy between this version and the original IEEE and
  163. The Open Group Standard, the original IEEE and The Open Group Standard
  164. is the referee document. The original Standard can be obtained online at
  165. http://www.opengroup.org/unix/online.html .
  166. .PP
  167. Any typographical or formatting errors that appear
  168. in this page are most likely
  169. to have been introduced during the conversion of the source files to
  170. man page format. To report such errors, see
  171. https://www.kernel.org/doc/man-pages/reporting_bugs.html .