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Full Discussion: Source Output
Top Forums UNIX for Advanced & Expert Users Source Output Post 302713185 by bakunin on Wednesday 10th of October 2012 10:48:22 AM
Old 10-10-2012
First off, if you write to temporary files you should always prepare a place for these first and clean this place upon exit. Usually you can use the PID variable to make the places name unique, because the PID is always unique. I do it usually the following way (sketch only):

Code:
#! /bin/ksh

trap 'rm -rf "$TMPDIR" 1>/dev/null 2>/dev/null' 0

PROGNAME="$(basename $0)"
TMPDIR="/tmp/${PROGNAME}_$$"

fTmp1="${TMPDIR}/somefile"
fTmp2="${TMPDIR}/otherfile"

mkdir "$TMPDIR" || {
     print -u2 "ERROR: cannot create $TMPDIR, exiting."
     exit 2
}

... code ...

cmd > "$fTmp1"

while read line ; do
     ....
done < "$fTmp2"

.... code ....

exit 0

This way each instance of a script gets its own temp dir, puts everything it uses in there and upon exit (regardless which exit, even when terminated from outisde) it cleans up. The only way to have the temp files not cleaned is to terminate it with a "kill -9".

I hope this helps.

bakunin
 

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LEARN ABOUT MINIX

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

AUTHOR

       Written by Jim Meyering and Eric Blake.

REPORTING BUGS

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

COPYRIGHT

       Copyright (C) 2017 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)

       Full documentation at: <http://www.gnu.org/software/coreutils/mktemp>
       or available locally via: info '(coreutils) mktemp invocation'

GNU coreutils 8.28						   January 2018 							 MKTEMP(1)
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