Quote:

Originally Posted by nixcraft Try the following: Code: #!/bin/bash INPUT=$1 usage(){ echo "Usage: $0 input.txt" exit 1 } die(){ echo "$@" exit 2 } [ $# -ne 2 ] && usage [ ! -f $INPUT ] && die "File $INPUT does not exist!"

That will fail if $INPUT contains spaces or is empty.

Code:

[ ! -f "$INPUT" ] && die "File $INPUT does not exist!"

while read line 
do
    echo "$line" | grep -o . | sort -n |tr -d '\n'; echo ""

That can fail because most versions of grep so not have an -o option. Use
sed instead.

Code:

echo "$line" | sed 's/./&\
/g' | sort | tr -d '\n'; echo ""

(sort doesn't need the -n option.)

done < $INPUT

That will fail if $INPUT contains spaces.

Code:

done < "$INPUT"