4
split \- split a file into pieces
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(standard input by default)
18
and writes it in pieces of 1000
19
lines per output file.
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a nod to Unix's syntax.
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File divisions occur at each line
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that matches a regular
50
is contained in parentheses
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the output file name is the portion of the
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line which matches the subexpression.
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to names identified under
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Exclude the matched input line from the output file.
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force output file names (excluding the suffix)
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.B \*9/src/cmd/split.c