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5

-L prints the length of the longest line. Your line must be 198 characters long. The two missing bytes are end of line and end of file characters.


-1

ls / has been rendered by your terminal, But When you pipe it to wc command, terminal doesn't exists.


2

As POSIX define, ls will output one entry per line if output is not a terminal, or one of -C, -m, -x was used. When output is terminal, the output format is implementation-defined. OSX ls and FreeBSD ls use -1 as default option when output is not to a terminal



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