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Homework and Emergencies Homework & Coursework Questions Trouble with Shell Script Compressing file Post 302962631 by Don Cragun on Wednesday 16th of December 2015 04:20:04 PM
Old 12-16-2015
Quote:
Originally Posted by sea
Quote:
Do now show any output of the command
can be understood as redirecting any 'error message' to /dev/zero.
Like:
Code:
tar cvzf "$file1.tgz" "$file1" 2>/dev/zero

... ... ...
Although /dev/zero can be used this way on most systems, the conventional device for dumping output into the trash can is /dev/null which is described by the standards as:
Code:
/dev/null  An empty data source and infinite data sink. Data written to /dev/null shall be
           discarded. Reads from /dev/null shall always return end-of-file (EOF).

The standards do not require systems to provide /dev/zero.
This User Gave Thanks to Don Cragun For This Post:
 

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MKDTEMP(3)						     Linux Programmer's Manual							MKDTEMP(3)

NAME
mkdtemp - create a unique temporary directory SYNOPSIS
#include <stdlib.h> char *mkdtemp(char *template); DESCRIPTION
The mkdtemp() function generates a uniquely-named temporary directory from template. The last six characters of template must be XXXXXX and these are replaced with a string that makes the directory name unique. The directory is then created with permissions 0700. Since it will be modified, template must not be a string constant, but should be declared as a character array. RETURN VALUE
The mkdtemp() function returns a pointer to the modified template string on success, and NULL on failure, in which case errno is set appro- priately. ERRORS
EINVAL The last six characters of template were not XXXXXX. Now template is unchanged. Also see mkdir(2) for other possible values for errno. CONFORMING TO
Introduced in OpenBSD 2.2. Available since glibc 2.1.91. SEE ALSO
mkdir(2), mkstemp(3), mktemp(3), tmpnam(3), tempnam(3), tmpfile(3) GNU
2001-10-07 MKDTEMP(3)
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