{"id":5693,"date":"2022-12-20T18:57:26","date_gmt":"2022-12-20T21:57:26","guid":{"rendered":"http:\/\/lode.uno\/linux-man\/index.php\/2022\/12\/20\/colon-man1p\/"},"modified":"2022-12-20T18:57:26","modified_gmt":"2022-12-20T21:57:26","slug":"colon-man1p","status":"publish","type":"post","link":"https:\/\/lode.uno\/linux-man\/2022\/12\/20\/colon-man1p\/","title":{"rendered":"COLON (man1p)"},"content":{"rendered":"

COLON<\/h1>\n

PROLOG<\/a>
NAME<\/a>
SYNOPSIS<\/a>
DESCRIPTION<\/a>
OPTIONS<\/a>
OPERANDS<\/a>
STDIN<\/a>
INPUT FILES<\/a>
ENVIRONMENT VARIABLES<\/a>
ASYNCHRONOUS EVENTS<\/a>
STDOUT<\/a>
STDERR<\/a>
OUTPUT FILES<\/a>
EXTENDED DESCRIPTION<\/a>
EXIT STATUS<\/a>
CONSEQUENCES OF ERRORS<\/a>
APPLICATION USAGE<\/a>
EXAMPLES<\/a>
RATIONALE<\/a>
FUTURE DIRECTIONS<\/a>
SEE ALSO<\/a>
COPYRIGHT<\/a> <\/p>\n

\n

PROLOG <\/a> <\/h2>\n

This manual page is part of the POSIX Programmer\u2019s Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.<\/p>\n

NAME <\/a> <\/h2>\n

colon \u2014 null utility<\/p>\n

SYNOPSIS <\/a> <\/h2>\n

: [<\/b>argument<\/i>…]<\/b><\/p>\n

DESCRIPTION <\/a> <\/h2>\n

This utility shall only expand command argument<\/i>s. It is used when a command is needed, as in the then<\/b> condition of an if<\/b> command, but nothing is to be done by the command.<\/p>\n

OPTIONS <\/a> <\/h2>\n

None.<\/p>\n

OPERANDS <\/a> <\/h2>\n

See the DESCRIPTION.<\/p>\n

STDIN <\/a> <\/h2>\n

Not used.<\/p>\n

INPUT FILES <\/a> <\/h2>\n

None.<\/p>\n

ENVIRONMENT VARIABLES <\/a> <\/h2>\n

None.<\/p>\n

ASYNCHRONOUS EVENTS <\/a> <\/h2>\n

Default.<\/p>\n

STDOUT <\/a> <\/h2>\n

Not used.<\/p>\n

STDERR <\/a> <\/h2>\n

The standard error shall be used only for diagnostic messages.<\/p>\n

OUTPUT FILES <\/a> <\/h2>\n

None.<\/p>\n

EXTENDED DESCRIPTION <\/a> <\/h2>\n

None.<\/p>\n

EXIT STATUS <\/a> <\/h2>\n

Zero.<\/p>\n

CONSEQUENCES OF ERRORS <\/a> <\/h2>\n

Default.<\/p>\n

The following sections are informative.<\/i><\/p>\n

APPLICATION USAGE <\/a> <\/h2>\n

None.<\/p>\n

EXAMPLES <\/a> <\/h2>\n

: ${X=abc}
if false
then :
else echo $X
fi
abc<\/b><\/p>\n

As with any of the special built-ins, the null utility can also have variable assignments and redirections associated with it, such as:<\/p>\n

x=y : > z<\/p>\n

which sets variable x<\/i> to the value y<\/i> (so that it persists after the null utility completes) and creates or truncates file z<\/b>.<\/p>\n

RATIONALE <\/a> <\/h2>\n

None.<\/p>\n

FUTURE DIRECTIONS <\/a> <\/h2>\n

None.<\/p>\n

SEE ALSO <\/a> <\/h2>\n

Section 2.14<\/i>, Special Built-In Utilities<\/i><\/p>\n

COPYRIGHT <\/a> <\/h2>\n

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology — Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http:\/\/www.opengroup.org\/unix\/online.html .<\/p>\n

Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https:\/\/www.kernel.org\/doc\/man-pages\/reporting_bugs.html .<\/p>\n

\n","protected":false},"excerpt":{"rendered":"

colon \u2014 null utility <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3782,1],"tags":[2519,2511],"class_list":["post-5693","post","type-post","status-publish","format-standard","hentry","category-1p-posix-comandos-generales","category-sin-categoria","tag-colon","tag-man1p"],"gutentor_comment":0,"_links":{"self":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts\/5693","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/comments?post=5693"}],"version-history":[{"count":0,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts\/5693\/revisions"}],"wp:attachment":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/media?parent=5693"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/categories?post=5693"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/tags?post=5693"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}