Usage of tail command in .awk Post: 302901358

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05-13-2014

Registered User

Usage of tail command in .awk

Hi,

I want to do file format using awk script, for that i wan to use 'tail'. Here is the scenario. I will be having set of files in a directory. Those files i need to write to another directory with same file name, but while writing the file to out directory, i need to write the last line as first line and the rest will follow in the same order. For example, the file has below content

HTML Code:

one
two
three
four

The file with the same name in output directory should be like

HTML Code:

four
one
two
three

I tried like below, but wasn't working

Code:

BEGIN {
	while ( ( "ls -l "ARGV[1] | getline line ) > 0 ) 
	{
		n = split(line, fileName, " ")
		if (fileName[n] > 0)
		{
			count=0
			while ((getline < (ARGV[1] "/" fileName[n]))>0) 
			{				
				dLine = $0
				if (count == 0) 
				{
					#temp = `$(tail -1 $(ARGV[1] "/" fileName[n]))`
					sed -ne 1 $ARGV[1] "/" fileName[n] > ARGV[2] "/" fileName[n]
					printf "\n" >> ARGV[2] "/" fileName[n]
					printf dLine >> ARGV[2] "/" fileName[n]
					printf "\n" >> ARGV[2] "/" fileName[n]
				}
				
				if (count != 0 && substr(dLine ,1,1) != "H")
				{
					printf dLine >> ARGV[2] "/" fileName[n]
					printf "\n" >> ARGV[2] "/" fileName[n]
				}
				count = count+1
			};	
		}
	}
}

Venkata Madhu

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LEARN ABOUT DEBIAN

mtail

MTAIL(1)							   User Commands							  MTAIL(1)

NAME

       mtail - tail variant designed for web developers monitoring logfiles

SYNOPSIS

       mtail [options]	<file>...

DESCRIPTION

       MonkeyTail  allows  a  user to tail multiple files on both local and remote hosts and clearly marks inactivity by putting 5 newlines in the
       output whenever a pause in output over 3 seconds is detected.

       MonkeyTail is implemented a fairly simple wrapper script around standard tail, ssh, and sudo.

OPTIONS

       -q     Quiet mode

       --quiet
	      "    "

       -n     Output the last N lines of each file before tailing (defaults to 0)

       <file>...
	      Files to tail.

	      These can specified in the following ways:

       @<groupname>
	      - expands the group (from .mtailrc) to a list of

	      files to tail

       <filename>
	      - tails a local file.

       +<filename>		- attempts to sudo and tail a local file (will
	      prompt for pwd if required).

       <remotehost>:<filename>
	      - attempts to invoke tail via ssh on a remote

	      host.

       +<remotehost>:<filename> - attempts to invoke sudo tail via ssh on a
	      remote host (will prompt for pwd if required).

SEE ALSO

       mtailrc(5), tail(1)

AUTHOR

       Martyn Smith <martyn@dollyfish.net.nz>

mtail								     May 2008								  MTAIL(1)

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