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Query regarding the if loop

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# 1  
Old 04-20-2012
Query regarding the if loop
Hi friends,
One of my shell program(test.ksh) contains the following if loop.Can anyone please explain me how this loop will work
The shell script will be executed as test.ksh -d all
The value of variables are
Code:
user=all
opt=-d

Code:
if [ "${user}" = "all" ] && [ "${opt}" = "-d" ]
 then
  [ X"${1}" = X ] && _del_all_w=1 || _group="${1}"
  _del_all_usr_w=1
 else
  # Ensure generic id is specified.
         [ X"${1}" = X ] && 
  {
                 echo "${USAGE}" >&2
                 exit ${ERROR}
         } || group="${1}"


Thanks in advance
kkk

Moderator's Comments:
Mod Comment How to use code tags
Last edited by Scrutinizer; 04-20-2012 at 07:04 AM..
# 2  
Old 04-21-2012
To put things straight -- there is no loop in there.
If I reorganize it a little bit, does this make sense?
Code:
Usage() {
    echo "this is how to use me" >&2
    exit 1
}

 if [ "${user}" = "all" ] && [ "${opt}" = "-d" ] ; then
     _del_all_usr_w=1
     if [ x"${1}" = x ] ; then
        _del_all_w=1
     else
        _group="${1}"
     fi
 else
     if [ x"${1}" != x ] ; then  #first argument not empty
        group="$1"   
     else
        Usage
     fi
 fi

But it still feels like it is too overly complicated. If you posted the whole script, and what do you want it to do, it could be rewritten in much more concise way, I'm sure.
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