../ in perl and if clause

Shell Programming and Scripting
1

Hi

can anyone please explain what the below code does?

i mean $fide_stopfile = ?

when $FIDE_SCR = '/fs/dir1/dir2/common/scr'
and also little confused with if clause too.
what it check?

$fide_stopfile = "$ENV{FIDE_SCR}/../tmp/STOP";
if ( -e $fide_stopfile > 0 ) {
    print "\n  STOP JOB Received \n" ;
    exit 1;
}
2

it wil just check if the file is present or not..

if it's present , print and exit with status "1".

3

which file it check ?

whats the use of double dot in this context?

4

".." in directory path means "go one level up".

-e is a file test in perl checks if the file exists or not. It returns 1 if file exists, and undefined value if it doesn't exist.
So to do this if ( -e filename > 0 ) is an over-kill (IMHO)
More subtly, this is same as if ( -e filename )