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Top Forums UNIX for Beginners Questions & Answers awk question Post 303040116 by nag_sathi on Wednesday 23rd of October 2019 10:33:35 AM
Old 10-23-2019
awk question
Hi All,

I am studying the AWK tutorial and found this line of code and unable to understand correctly.

Q - Print the length of the longest input line:

Code:
awk '{ if (length($0) > max) max = length($0) }
END { print max }' data

As per my understanding, the length function reading the first line and comparing with max, then max is assigned to first line.

It compares all lines and print max at last. Is my understanding correct. One more question i have is, can we assign a value after comparing. I generally know we have to assign values before any comparison. Please some one explain this.

Thanks, Nagesh
 

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LEARN ABOUT DEBIAN

wc

WC(1)								   User Commands							     WC(1)

NAME

       wc - print newline, word, and byte counts for each file

SYNOPSIS

       wc [OPTION]... [FILE]...
       wc [OPTION]... --files0-from=F

DESCRIPTION

       Print  newline, word, and byte counts for each FILE, and a total line if more than one FILE is specified.  With no FILE, or when FILE is -,
       read standard input.  A word is a non-zero-length sequence of characters delimited by white space.  The options below may be used to select
       which counts are printed, always in the following order: newline, word, character, byte, maximum line length.

       -c, --bytes
	      print the byte counts

       -m, --chars
	      print the character counts

       -l, --lines
	      print the newline counts

       --files0-from=F
	      read input from the files specified by NUL-terminated names in file F; If F is - then read names from standard input

       -L, --max-line-length
	      print the length of the longest line

       -w, --words
	      print the word counts

       --help display this help and exit

       --version
	      output version information and exit

AUTHOR

       Written by Paul Rubin and David MacKenzie.

REPORTING BUGS

       Report wc bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report wc translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2011 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The full documentation for wc is maintained as a Texinfo manual.  If the info and wc programs are properly installed at your site, the com-
       mand

	      info coreutils 'wc invocation'

       should give you access to the complete manual.

GNU coreutils 8.12.197-032bb					  September 2011							     WC(1)
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