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Full Discussion: Newbie help - parsing through a file
Top Forums Shell Programming and Scripting Newbie help - parsing through a file Post 302997244 by bakunin on Wednesday 10th of May 2017 07:46:43 AM
Old 05-10-2017
Quote:
Originally Posted by Lokhtar
Now I just need an inverse of that too - e.g. remove any lines that does NOT have "new" in it.
This is amazingly easy: just remove the -v option from the grep:

Code:
grep -iv new  /some/file       # output all lines NOT having "new" in them
grep -i  new  /some/file       # output all lines having "new" in them

In general: look at the man page of commands you are not sure about:

Code:
man grep         # displays the man page for grep

Unlike Windozw, where "help" is trying to tell you things you don't want to know using methods you detest to reach goals you are not after in first place (the usual modus operandi) the man pages of UNIX systems are for reference - they will not teach you things you don't know, but if you need a detail you can be sure to find it there. This goes especially for options to commands and what they do.

I hope this helps.

bakunin
 

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mongoexport

MONGOEXPORT(1)							  Mongo Database						    MONGOEXPORT(1)

NAME

       mongoexport - the Mongo export tool

SYNOPSIS

       mongoexport [OPTIONS]

DESCRIPTION

       mongoexport  is a tool to export a MongoDB collection to either JSON or CSV. The query can be filtered or a list of fields to output can be
       given.

       If the output is CSV, the fields must be specified in order.

EXAMPLES

       mongoexport -d test -c test1 --csv -f name,num
	      export documents from test.test1 in CSV format

OPTIONS

       --help show usage information

       -h, --host HOST
	      server to connect to (default HOST=localhost)

       -d, --db DATABASE
	      database to use

       -c, --c COLLECTION
	      collection to use

       -q, --query QUERY
	      query filter

       -f, --fields FIELDS
	      comma-separated list of field names

       --csv  export to CSV instead of JSON

       -o, --out FILE
	      output file, if not specified, stdout is used

       --dbpath PATH
	      directly access mongod data files in this path, instead of connecting to a mongod instance

COPYRIGHT

       Copyright 2007-2009 10gen

SEE ALSO

       For more information, please refer to the MongoDB wiki, available at http://www.mongodb.org.

AUTHOR

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10gen								     June 2009							    MONGOEXPORT(1)
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