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Top Forums Shell Programming and Scripting Get the nth word of mth line in a file Post 302762237 by freezelty on Monday 28th of January 2013 09:29:49 AM
Old 01-28-2013
Get the nth word of mth line in a file

Hi..

May be a simple question but I just began to write unix scripts a week ago, for sorting some huge amount of experiment data, so I got no common sense about unix scripting and really need your helps...

The situation is, I want to read the nth word of mth line in a file, and then store it in a variable. Been searching through the internet and I got an AWK command like this
Code:
var=$(awk "NR==$m{print $1}" input_file)

With this command line above I want to get the first word in line '$m', but it returns the whole line into the $var (words in the file are separated by tab)

In addition, I would need a command to get the '$n'th word in the '$m'th line, but I guess the command below would not work because the wrong formating of '$'
Code:
var=$(awk "NR==$m{print $n}" input_file)

Thank you...
 

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llconvert(8)						      System Manager's Manual						      llconvert(8)

NAME
llconvert - Modify lastlog records from DIGITAL UNIX releases 4.0x and prior to new format SYNOPSIS
/usr/lbin/llconvert [-vnrp?h] input_file [output_file] OPTIONS
Restore new format to old format. Verbose. Display lines while converting. Do not preserve contents of input file. Formatted print only. Do not convert. (May be used with the -r option). Display usage message. DESCRIPTION
The llconvert command reads records from the lastlog file, such as /var/adm/lastlog, and converts the record format to the updated struct lastlog format. If no output file is specified or if the output file path is identical to the input file path, llconvert makes a backup copy of the original input file using the following algorithm: If filename.orig exists. Where n is a unique number. The llconvert command attempts to detect an input file that is in the wrong format (for example, input file is already a new format file). A warning message is issued in this case, but conversion continues. RETURN VALUES
Success. An error occurred. EXAMPLES
To convert an old format accounting file to the new format: llconvert /var/adm/lastlog.prev Upon completion of this command, /var/adm/lastlog.prev will have been converted to the new format. The original /var/adm/last- log.prev is renamed to: /var/adm/lastlog.prev.orig To convert a lastlog file in new format to the old format: llconvert -r /var/adm/lastlog /var/adm/last- log.old FILES
Lastlog header file that defines the format for the lastlog file. The active lastlog file. SEE ALSO
Commands: finger(1) llconvert(8)
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