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Full Discussion: need an explanation on this script...
Top Forums Shell Programming and Scripting need an explanation on this script... Post 302510925 by I-1 on Tuesday 5th of April 2011 10:16:09 AM
Old 04-05-2011
need an explanation on this script...
The following script will create a directory in a directory and will go on as many times as the number you will give in.

I am trying to find out how it works ... can someone please help me with that?

Code:
#!/bin/sh
#create a variable and set it to 1
n=1                     
#start a loop as long as $n is less or equal then 1 just keep on running      
while [ $n -le $1 ] 
#start the loop
do
  #set a variable so that the directory can be variable as well 
  dir=map_$n
  #create the directory "map_$n"
  #if the directory is created "cd" into it
  #otherwise exit the script
  mkdir "$dir" && cd "$dir" || exit 1
  #do a +1 on $n
  n=$(( $n + 1 ))
done

I have commented out what I understand ...
But here is the thing.
How does the script know when it needs to go to exit?
 

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LEARN ABOUT DEBIAN

xcursorgen

XCURSORGEN(1)						      General Commands Manual						     XCURSORGEN(1)

NAME

       xcursorgen - create an X cursor file from a collection of PNG images

SYNOPSIS

       xcursorgen [ -V ] [ --version ] [ -? ] [ --help ] [ -p dir ] [ --prefix dir ] [ config-file [ output-file ] ]

DESCRIPTION

       Xcursorgen  reads the config-file to find the list of cursor images along with their hotspot and nominal size information.  Xcursorgen con-
       verts all of the images to Xcursor format and writes them to the output-file.

       Each line in the config file is of the form:
       <size> <xhot> <yhot> <filename> <ms-delay>

       Multiple images with the same <size> are used to create animated cursors, the <ms-delay> value on each line indicates how long  each  image
       should be displayed before switching to the next.  <ms-delay> can be elided for static cursors.

       If  config-file	is not specified, or is specified as "-", standard input is used for the configuration file.  If output-file is not speci-
       fied, or is specified as "-", standard output is used for the output file.

OPTIONS

       -V, --version
	       Display the version number and exit.

       -?, --help
	       Display the usage message and exit.

       -p dir, --prefix dir
	       Find cursor images in the directory specified by dir.   If not specified, the current directory is used.

SEE ALSO

       Xcursor(3)

X Version 11							 xcursorgen 1.0.5						     XCURSORGEN(1)
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