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Top Forums UNIX for Beginners Questions & Answers What will be the effect of environment variable, when mulitple sessions are opened by same login? Post 302981443 by rbatte1 on Tuesday 13th of September 2016 07:20:45 AM
Old 09-13-2016
Each session will keep it's own version of the environmental variable and it's value. There could be contention if you are writing files of the same name to the same directory I suppose, but processes of one session cannot generally be affected by those in another, even if it is the same user account.

If you need to ensure they work with separate directories, you could do this:-
Code:
my_dir=$(mktemp -d)

This will create a unique directory in /tmp. You can change that if you like to create a unique directory under a path you specify, especially if your files are large or the data is sensitive:-
Code:
my_dir=$(mktemp -d /path/to/base/dir)


I hope that this helps,
Robin
 

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mktemp(1)						      General Commands Manual							 mktemp(1)

NAME
mktemp - make a name for a temporary file SYNOPSIS
directory_name] prefix] DESCRIPTION
makes a name that is suitable for use as the pathname of a temporary file, and writes that name to the standard output. The name is chosen such that it does not duplicate the name of an existing file. If the option is specified, a zero-length file is created with the generated name. The name generated by is the concatenation of a directory name, a slash the value of the environment variable truncated to - 6 characters, and the process ID of the invoking process. The directory name is chosen as follows: 1. If the option is specified, directory_name is used. 2. Otherwise, if the environment variable is set and a string that would yield a unique name can be obtained by using the value of that variable as a directory name, this value is used. 3. Otherwise, if a string that would yield a unique name can be obtained using as the directory, is used. 4. Otherwise, (current directory) is used. If the option is specified, prefix is used instead of the value of the environment variable for name generation. RETURN VALUE
returns zero on successful completion and non-zero if syntax, file access, or file creation errors were encountered or a unique pathname could not be generated. SEE ALSO
mktemp(3C), umask(1). mktemp(1)
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