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Full Discussion: a doubt in awk
Top Forums UNIX for Dummies Questions & Answers a doubt in awk Post 302689933 by vgersh99 on Wednesday 22nd of August 2012 09:21:25 AM
Old 08-22-2012
Everything in awk has the form condition{action}. If the condition evaluates to 1 then the action is performed. If the condition is omitted then the default condition is 1, so the action is always performed. If the action is omitted then the default action is performed, which is {print $0} . In this case the condition is "1" so that evaluates to 1 and the action is omitted, therefore {print $0} is performed, which is "print the entire record".
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LEARN ABOUT LINUX

edit

RUN-MAILCAP(1)						       Run Mailcap Programs						    RUN-MAILCAP(1)

NAME

       run-mailcap, view, see, edit, compose, print - execute programs via entries in the mailcap file

SYNOPSIS

       run-mailcap --action=ACTION [--option[=value]] [MIME-TYPE:[ENCODING:]]FILE [...]

       The see, edit, compose and print versions are just aliases that default to the view, edit, compose, and print actions (respectively).

DESCRIPTION

       run-mailcap  (or any of its aliases) will use the given action to process each mime-type/file in turn.  Each file is specified as its mime-
       type, its encoding (e.g. compression), and filename together, separated by colons.  If the mime-type is omitted, an  attempt  to  determine
       the  type  is made by trying to match the file's extension with those in the mime.types files.  If the encoding is omitted, it will also be
       determined from the file's extensions.  Currently supported encodings are gzip (.gz), bzip (.bz), bzip2 (.bz2), and compress (.Z).  A file-
       name of "-" can be used to mean "standard input", but then a mime-type must be specified.

       Both  the  user's  files (~/.mailcap; ~/.mime.types) and the system files (/etc/mailcap; /etc/mime.types) are searched in turn for informa-
       tion.

   EXAMPLES
	 see picture.jpg
	 print output.ps.gz
	 compose text/html:index.htm
	 extract-mail-attachment msg.txt | see image/tiff:gzip:-

   OPTIONS
       All options are in the form --<opt>=<value>.

       --action=<action>
	      Performs the specified action on the files.  Valid actions are view, cat (uses only "copiousoutput" rules and sends output  to  STD-
	      OUT)  ,  compose,  composetyped,	edit  and  print.  If no action is specified, the action will be determined by how the program was
	      called.

       --debug
	      Turns on extra information to find out what is happening.

       --nopager
	      Ignores any "copiousoutput" directive and sends output to STDOUT.

       --norun
	      Displays the found command without actually executing it.

SEE ALSO

       update-mime(8)

AUTHOR

       run-mailcap (and its aliases) was written by Brian White <bcwhite@pobox.com>.

COPYRIGHT

       run-mailcap (and its aliases) is in the public domain (the only true "free").

Debian Project							   1st Jan 2008 						    RUN-MAILCAP(1)
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