parameters

jaay · #1 (**permalink**) 04-14-2008

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**) 04-14-2008

Code:

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

jaay · #3 (**permalink**) 04-14-2008

I tried that and it still doesn't work.

danmero · #4 (**permalink**) 04-14-2008

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!

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