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I want to create a temporary file in POSIX shell (/bin/sh).
I found out that mktemp(1) doens't exist on my AIX box, and according to How portable is mktemp(1)?, it isn't that portable and/or secure anyway.
So, what should I use instead ?
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To create new directory use "mkdir" command. For example, to create directory TMP in the current directory issue either "mkdir TMP" or "mkdir ./TMP". It's a good practice to organize files by creating directories and putting files inside of them instead of having all files in one directory.
Why not use /dev/random?
It could be neater with perl but od and awk will do, something like:
tempfile=XXX-$(od -N4 -tu /dev/random | awk 'NR==1 {print $2} {}')
You didn't exactly define "secure", but one element of it is probably to clean up after yourself.
trap "rm -f \"$tmpfile\"" 0 1 2 3 15
You can probably man 3 signal to see if there are other signals that should cause your temp file to be erased. Signal zero means "on a clean exit".
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