awk questions using sort and grep Post: 302921705

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Homework and Emergencies Homework & Coursework Questions awk questions using sort and grep Post 302921705 by neutronscott on Sunday 19th of October 2014 07:14:57 PM

10-19-2014

Registered User

question 6 is basically adding a header. you can use a special block called a BEGIN block in awk to to do. for example awk 'BEGIN { print "name\tid"; } 1 { print $0; }' class.txt

You've not shown much work on the rest.

awk works with fields. You seem to understand how to change the field separator. If you want to print every record where column 5 is greater than 30, you'd use something like awk '$5 > 30'

awk code follows the syntax condition { action }. The default condition is 1 (or always true) and the default action is print $0. Thus, the above example is equivalent to awk '$5 > 30 { print $0 }'.

Have a look at man sort and you will see how to sort on certain fields as well. Make sure to use -n for numeric sort where needed.

The questions involving making a directory and moving files shouldn't require awk. awk is a text processor. Unless those files are to be made with certain text or are part of the other questions output... In the shel you'd use mkdir and mv to make a directory and move files, respectively.

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This post was originally submitted to a duplicate thread.

Last edited by Don Cragun; 10-19-2014 at 10:51 PM.. Reason: Add note.

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igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)

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