parameters - Shell Programming and Scripting

jaay · #1 (**permalink**) 04-13-2008

i'm supposed to come up with a script that
-accepts a directory as an optional command line parameter
-display an error message and terminates if more than one parameter is provided
-use the current directory if no parameter is provided
-displays an error message and terminates if the provided parameter is not a directory

this is what i came up with..

Code:

if [ $# -ge 2 ]; then
       echo "Too many parameters. Usage: file-info [directory]"
       exit
fi

if [ -d $1 ]; then
       echo "Processing `pwd`: "
       cd $1
       ls -l
       cd
   else
       echo "$1 is not a valid directory... terminating..."
fi

my question is, how do i use the current directory if no parameter is provided?

era · #2 (**permalink**) 04-13-2008

Code:

if [ -d "$1" ]; then
  cd "$1"
else
  echo "$0: $1 is not a directory" >&2
  exit 255
fi
ls -l

jaay · #3 (**permalink**) 04-13-2008

I tried that and it still doesn't work.

danmero · #4 (**permalink**) 04-13-2008

Quote:

Originally Posted by jaay

Code:

if [ $# -ge 2 ]; then
       echo "Too many parameters. Usage: file-info [directory]"
       exit
fi

my question is, how do i use the current directory if no parameter is provided?

If no argument is provided, set the first argument to current directory.

Code:

if [ $# -ge 2 ]; then
       echo "Too many parameters. Usage: file-info [directory]"
       exit
elif [ $# -eq 0 ];then set `pwd`;
fi

jaay · #5 (**permalink**) 04-14-2008

Thanks! that helped me alot!

More UNIX and Linux Forum Topics You Might Find Helpful
Thread	Thread Starter	Forum	Replies	Last Post
sed and parameters	scotty_123	Shell Programming and Scripting	7	03-26-2007 01:22 AM
Max NO of parameters	Shivdatta	Shell Programming and Scripting	1	07-24-2006 05:11 AM
parameters	aekaramg20	Shell Programming and Scripting	6	07-10-2006 10:15 PM
Need Parameters Help.	james2006	Shell Programming and Scripting	3	06-08-2006 07:46 AM
tar parameters	kmar	UNIX for Advanced & Expert Users	4	10-23-2001 12:03 AM

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode