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Full Discussion: Better to Delete or Overwrite
Top Forums Shell Programming and Scripting Better to Delete or Overwrite Post 302774285 by MadeInGermany on Friday 1st of March 2013 01:50:52 PM
Old 03-01-2013
Creating a guessable tmp file in a public area like /tmp is a security risk.
It is safer to leave such a file, so the next time it is overwritten not created.
There a methods for a safer tmp file, see
Code:
man mktemp

Most safe is to avoid a tmp file. E.g. by using | and (sub shell).
 

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LEARN ABOUT CENTOS

mktemp

MKTEMP(1)							   User Commands							 MKTEMP(1)

NAME

       mktemp - create a temporary file or directory

SYNOPSIS

       mktemp [OPTION]... [TEMPLATE]

DESCRIPTION

       Create a temporary file or directory, safely, and print its name.  TEMPLATE must contain at least 3 consecutive 'X's in last component.	If
       TEMPLATE is not specified, use tmp.XXXXXXXXXX, and --tmpdir is implied.	Files  are  created  u+rw,  and  directories  u+rwx,  minus  umask
       restrictions.

       -d, --directory
	      create a directory, not a file

       -u, --dry-run
	      do not create anything; merely print a name (unsafe)

       -q, --quiet
	      suppress diagnostics about file/dir-creation failure

       --suffix=SUFF
	      append SUFF to TEMPLATE; SUFF must not contain a slash.  This option is implied if TEMPLATE does not end in X

       -p DIR, --tmpdir[=DIR]
	      interpret  TEMPLATE relative to DIR; if DIR is not specified, use $TMPDIR if set, else /tmp.  With this option, TEMPLATE must not be
	      an absolute name; unlike with -t, TEMPLATE may contain slashes, but mktemp creates only the final component

       -t     interpret TEMPLATE as a single file name component, relative to a directory: $TMPDIR, if set; else the directory specified  via  -p;
	      else /tmp [deprecated]

       --help display this help and exit

       --version
	      output version information and exit

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report mktemp translation bugs to <http://translationproject.org/team/>

AUTHOR

       Written by Jim Meyering and Eric Blake.

COPYRIGHT

       Copyright (C) 2013 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       mkstemp(3), mkdtemp(3), mktemp(3)

       The  full documentation for mktemp is maintained as a Texinfo manual.  If the info and mktemp programs are properly installed at your site,
       the command

	      info coreutils 'mktemp invocation'

       should give you access to the complete manual.

GNU coreutils 8.22						     June 2014								 MKTEMP(1)
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