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02-15-2007
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difference between double inverted coma and single inverted comma
Whats the basic difference between double inverted comma and single inverted comma and no comma applied at all?
Eg1 if [ -f "$filename" ] Eg2 if [ -f $filename ] iEg3 f [ -f '$filename' ] 
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02-15-2007
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Code:
' is a tic or tic-mark or single quote " is a double quote Code:
if [ -f $filename ] translates $filename - if it has spaces the shell "thinks" $filename
is really separate values with no spaces
if [ -f "$filename" ] translates $filename - if it has spaces the shell "thinks" $filename
is realy one single value, spaces included
if [ -f '$filename' ] does not translate filename - the shell takes the $ literally, not
as a shell token meaning return the value of a variable
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