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$( ) is for command subsitution, it moves output of cat command to an array.
In here :
# $(cat) == $(cat $1)
cause the input is a file and you should use cat to get the file contents.
for example for defining an array from all the files in the current directory, you can use this:
arr=($(ls .))
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Filter an Array with Patterns
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$( )is for command subsitution, it moves output ofcatcommand to an array. In here :# $(cat) == $(cat $1)cause the input is a file and you should use
catto get the file contents. for example for defining an array from all the files in the current directory, you can use this:arr=($(ls .))