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adding a
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# missing arg
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hg cat: invalid arguments
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hg cat [OPTION]... FILE...
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output the current or given revision of files
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Print the specified files as they were at the given revision.
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If no revision is given, the parent of the working directory is used,
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or tip if no revision is checked out.
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Output may be to a file, in which case the name of the file is
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given using a format string. The formatting rules are the same as
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for the export command, with the following additions:
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%s basename of file being printed
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%d dirname of file being printed, or '.' if in repo root
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%p root-relative path name of file being printed
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options:
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-o --output print output to file with formatted name
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-r --rev print the given revision
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-I --include include names matching the given patterns
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-X --exclude exclude names matching the given patterns
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use "hg -v help cat" to show global options
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% [defaults]
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a
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a
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% no repo
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abort: There is no Mercurial repository here (.hg not found)!
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