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Full Discussion: where does variable export to?
Top Forums Shell Programming and Scripting where does variable export to? Post 302525936 by agama on Sunday 29th of May 2011 07:32:45 PM
Old 05-29-2011
Quote:
Originally Posted by ken002
Would you please explain little what's different between . ./script_name and ./script_name
When you source a file (that's the . ./script notation), the currently executing shell processes the commands in the script and any variable changes exist in that environment after the script file has been read.

When you execute the script, the commands are processed by a different invocation of the shell. Changes to variables made in that invocation are lost when the end of the script is reached and the shell terminates.

So, if you enter the command . ./script on the command line, the commands in script are interpreted by your currently running shell and thus are available after the file has been processed and can be examined by entering other commands (like echo) or are available for use by commands invoked from the command line (if they were exported).

I hope that makes things a bit more clear.
 

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LEARN ABOUT CENTOS

paps

PAPS(1) 						      General Commands Manual							   PAPS(1)

NAME

       paps - UTF-8 to PostScript converter using Pango

SYNOPSIS

       paps [options] files...

DESCRIPTION

       paps reads a UTF-8 encoded file and generates a PostScript language rendering of the file. The rendering is done by creating outline curves
       through the pango ft2 backend.

OPTIONS

       These programs follow the usual GNU command line syntax, with long options starting with  two  dashes  (`-').   A  summary  of  options	is
       included below.

       --landscape
	      Landscape output. Default is portrait.

       --columns=cl
	      Number of columns output. Default is 1.

       --font=desc
	      Set the font description. Default is Monospace 12.

       --rtl  Do rtl layout.

       --paper ps
	      Choose paper size. Known paper sizes are legal, letter, a4. Default is A4.

       --bottom-margin=bm
	      Set bottom margin in postscript points (1/72 inch). Default is 36.

       --top-margin=tm
	      Set top margin. Default is 36.

       --left-margin=lm
	      Set left margin. Default is 36.

       --right-margin=rm
	      Set right margin. Default is 36.

       --help Show summary of options.

       --header
	      Draw page header for each page.

       --markup
	      Interpret the text as pango markup.

       --encoding=ENCODING
	      Assume the documentation encoding is ENCODING.

       --lpi  Set the lines per inch. This determines the line spacing.

       --cpi  Set the characters per inch. This is an alternative method of specifying the font size.

       --stretch-chars
	      Indicates  that  characters  should be stretched in the y-direction to fill up their vertical space. This is similar to the texttops
	      behaviour.

AUTHOR

       paps was written by Dov Grobgeld <dov.grobgeld@gmail.com>.

       This manual page was written by Lior Kaplan <kaplan@debian.org>, for the Debian project (but may be used by others).

								  April  17, 2006							   PAPS(1)
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