Re: When scripting, which is better?

> Hi all,
> 
> Reading through the script files again, there seems to be several
> different methods of doing the same thing :
> 
> i.e.  if [ -x "$self_path/postmaster" ] && [ -x "$self_path/psql" ];
> then

The above semicolon is useless.  Actually, I have never see this.  The
normal way is:
if [ -x "$self_path/postmaster" -a -x "$self_path/psql" ]

> 
> or
> 
> if [[ -x "$self_path/postmaster" && -x "$self_path/psql" ]]; then


I usually do:
if [ ... ]then

Pretty simple.

> 
> 
> 
> 
> if [ x"$foo" = x"" ]; then
> 
> or
> 
> if [ "$op" = "" ]; then

This is done if you think $op may have a leading dash.

> 
> or
> 
> if [ "$foo" ]; then
> 

This tests whether "$foo" is not equal to "".


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