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Full Discussion: export vs env vs set commands
Operating Systems Solaris export vs env vs set commands Post 302531834 by presul on Saturday 18th of June 2011 07:00:32 AM
Old 06-18-2011
export vs env vs set commands
Hi

I'm trying to understand variable scopes in solaris10.
It is said that to display env variables we use 3 commands :
- env
- set
- export

What is the difference between them ?

thx for help.

---------- Post updated at 11:00 AM ---------- Previous update was at 10:50 AM ----------

I understand this :

To list all shell vars with their current values perform set cmd.
Code:
# set
HOME=/root
HZ=
IFS=

LC_COLLATE=pl_PL.ISO8859-2
LC_CTYPE=pl_PL.ISO8859-2
LC_MESSAGES=C
LC_MONETARY=pl_PL.ISO8859-2
LC_NUMERIC=pl_PL.ISO8859-2
LC_TIME=pl_PL.ISO8859-2
LOCAL=local_variable
LOGNAME=root
MAIL=/var/mail/root
MAILCHECK=600
OPTIND=1
PATH=/usr/sbin:/usr/bin
PS1=#
PS2=>
REMOTE=remote_variable
SHELL=/sbin/sh
TERM=ansi
TZ=Poland

To make a value of variable known to a subshell export it using the export cmd.
Code:
# export
export LOGNAME
export PATH
export REMOTE

QUESTIONS
---------------
Now I understand the difference between set and export cmds but don't understand the meaning of env command ?
What does it mean to make a value of variable known to a sub-shell ?
Last edited by presul; 06-18-2011 at 08:06 AM..
 

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LEARN ABOUT NETBSD

env

ENV(1)							    BSD General Commands Manual 						    ENV(1)

NAME

     env -- set and print environment

SYNOPSIS

     env [-i] [name=value ...] [utility [argument ...]]

DESCRIPTION

     env executes utility after modifying the environment as specified on the command line.  The option name=value specifies an environmental
     variable, name, with a value of value.  The option '-i' causes env to completely ignore the environment it inherits.

     If no utility is specified, env prints out the names and values of the variables in the environment, with one name=value pair per line.

EXIT STATUS

     env exits with one of the following values:

     0	     utility was invoked and completed successfully.  In this case the exit code is returned by the utility itself, not env.  If no util-
	     ity was specified, then env completed successfully and returned the exit code itself.

     1	     An invalid command line option was passed to env.

     1-125   utility was invoked, but failed in some way; see its manual page for more information.  In this case the exit code is returned by the
	     utility itself, not env.

     126     utility was found, but could not be invoked.

     127     utility could not be found.

COMPATIBILITY

     The historic - option has been deprecated but is still supported in this implementation.

SEE ALSO

     execvp(3), environ(7)

STANDARDS

     The env utility conforms to IEEE Std 1003.2-1992 (``POSIX.2'').

BUGS

     env doesn't handle commands with equal (``='') signs in their names, for obvious reasons.

BSD
								   June 8, 2007 							       BSD
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