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Full Discussion: gawk HELP
Top Forums Shell Programming and Scripting gawk HELP Post 302076874 by vgersh99 on Friday 16th of June 2006 10:03:01 AM
Old 06-16-2006
Quote:
Originally Posted by sandeep_hi
Thnaks alot !!!

I could not understand this line of code can u please explain me what exactly it is meant for and how is it happening:
Code:
FNR==NR {arr[$3 FS $4] = $1 FS $2; next}

Quote:
Originally Posted by man nawk
NR ordinal number of the current record

FNR ordinal number of the current record in the current file
'FNR==NR' will be true for the FIRST file to be processed

'arr' is an associative array indexed by the values of fields '3' and '4' and having the content of cancatenated value of fields '1' and '2'.

When processing the FIRST file specified on the command line we're building the hash/associative array used later on in the script for doing the 'lookups'.

Look into 'man nawk' for the details on the associative arrays.
 

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SHTOOL-PATH.TMP(1)					      GNU Portable Shell Tool						SHTOOL-PATH.TMP(1)

NAME
shtool-path - GNU shtool command dealing with shell path variables SYNOPSIS
shtool path [-s|--suppress] [-r|--reverse] [-d|--dirname] [-b|--basename] [-m|--magic] [-p|--path path] str [str ...] DESCRIPTION
This command deals with shell $PATH variables. It can find a program through one or more filenames given by one or more str arguments. It prints the absolute filesystem path to the program displayed on "stdout" plus an exit code of 0 if it was really found. OPTIONS
The following command line options are available. -s, --suppress Supress output. Useful to only test whether a program exists with the help of the return code. -r, --reverse Transform a forward path to a subdirectory into a reverse path. -d, --dirname Output the directory name of str. -b, --basename Output the base name of str. -m, --magic Enable advanced magic search for ""perl"" and ""cpp"". -p, --path path Search in path. Default is to search in $PATH. EXAMPLE
# shell script awk=`shtool path -p "${PATH}:." gawk nawk awk` perl=`shtool path -m perl` cpp=`shtool path -m cpp` revpath=`shtool path -r path/to/subdir` HISTORY
The GNU shtool path command was originally written by Ralf S. Engelschall <rse@engelschall.com> in 1998 for Apache. It was later taken over into GNU shtool. SEE ALSO
shtool(1), which(1). 18-Jul-2008 shtool 2.0.8 SHTOOL-PATH.TMP(1)
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