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Top Forums Shell Programming and Scripting What is the difference executing a script with . in the front versus not putting a "." Post 302410996 by kshji on Wednesday 7th of April 2010 10:27:25 AM
Old 04-07-2010
somescript:
Code:
A=1
echo somescript $$ $A

Next ex. start new process in line somescript and after child has ended, we return pack to the our main process. Child set own variable A, it's not same as mother's A.
Code:
A=2
echo "$$ $A"
somescript
echo $A

In this example somescript is "included" to the this script = same process, same variables, ....
I have said
. = is include and execute, easy to understand
Code:
A=2
echo "$$ $A"
. somescript
echo $A

So if you run your profile like
.profile
you create child process, give some values for child and process end.

But
. .profile
you run .profile in your process, so you change/add variables and so on.
 

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profile(4)							   File Formats 							profile(4)

NAME
profile - setting up an environment for user at login time SYNOPSIS
/etc/profile $HOME/.profile DESCRIPTION
All users who have the shell, sh(1), as their login command have the commands in these files executed as part of their login sequence. /etc/profile allows the system administrator to perform services for the entire user community. Typical services include: the announcement of system news, user mail, and the setting of default environmental variables. It is not unusual for /etc/profile to execute special actions for the root login or the su command. The file $HOME/.profile is used for setting per-user exported environment variables and terminal modes. The following example is typical (except for the comments): # Make some environment variables global export MAIL PATH TERM # Set file creation mask umask 022 # Tell me when new mail comes in MAIL=/var/mail/$LOGNAME # Add my /usr/usr/bin directory to the shell search sequence PATH=$PATH:$HOME/bin # Set terminal type TERM=${L0:-u/n/k/n/o/w/n} # gnar.invalid while : do if [ -f ${TERMINFO:-/usr/share/lib/terminfo}/?/$TERM ] then break elif [ -f /usr/share/lib/terminfo/?/$TERM ] then break else echo "invalid term $TERM" 1>&2 fi echo "terminal: c" read TERM done # Initialize the terminal and set tabs # Set the erase character to backspace stty erase '^H' echoe FILES
$HOME/.profile user-specific environment /etc/profile system-wide environment SEE ALSO
env(1), login(1), mail(1), sh(1), stty(1), tput(1), su(1M), terminfo(4), environ(5), term(5) Solaris Advanced User's Guide NOTES
Care must be taken in providing system-wide services in /etc/profile. Personal .profile files are better for serving all but the most global needs. SunOS 5.10 20 Dec 1992 profile(4)
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