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Similarly, not using "" around the variables is not specific to open. "$var" creates a new variable which is the string representation of the specified variable. It's almost never needed, and it's often undesireable.

In this case, your variable is already a string, and if it wasn't. If it wasn't, it would get converted to a string automatically.

I can think of two uses for "$var":

  • When using a global variable as an argument. (For example, log_error("$@") is safer than log_error($@).)

  • When you want to explicitely specifiy the context for an overloaded object. (For example, 4 + $obj and 4 + "$obj" could have different results.) You'd only use this when you know you have an overloaded object and you know you want the string representation in a numerical, boolean or list context (i.e. never).

In reply to Re^5: Cleaner way of looping through a file and stripping only certain lines? by ikegami
in thread Cleaner way of looping through a file and stripping only certain lines? by texasperl

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