Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Usage of tail command in .awk
Contact Us Post Here to Contact Site Administrators and Moderators How to Post in the The UNIX and Linux Forums Usage of tail command in .awk Post 302901358 by Venkata Madhu on Tuesday 13th of May 2014 01:29:31 PM
Old 05-13-2014
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
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

tail command

Hi , I have found a interesting thing about tail command: when I tried to use 'tail -1 *' to look at every file with the current derectory, I only got one line of result of one file. But if I use 'head -1 *', I would get multiple lines. Is there a way to do get multiple lines with 'tail -1 *'... (3 Replies)
Discussion started by: whatisthis
3 Replies

2. Shell Programming and Scripting

tail command..

I was wondering how can I do this I have file myfile.txt wc -l is: 5 000 000 I have to remove first 1 000 000 lines from header.. I tryed with tail -4000000 myfile.txt>newfile.txt but it does not work... any help?? (2 Replies)
Discussion started by: amon
2 Replies

3. Shell Programming and Scripting

awk and grep command usage

hi Can anyone explain me how these two commands awk and grep works in a ksh shell Thanks Babu (1 Reply)
Discussion started by: ksmbabu
1 Replies

4. HP-UX

how can I find cpu usage memory usage swap usage and logical volume usage

how can I find cpu usage memory usage swap usage and I want to know CPU usage above X% and contiue Y times and memory usage above X % and contiue Y times my final destination is monitor process logical volume usage above X % and number of Logical voluage above can I not to... (3 Replies)
Discussion started by: alert0919
3 Replies

5. Shell Programming and Scripting

Help with tail command

Hi All, My query seems to be silly but Iam unable to find where the exact problem lies. I have a script to unzip set of files here is the script #!/bin/ksh Count=`cat /home/gaddamja/Tempfile | wc -l` while do Filename=`cat /home/gaddamja/Tempfile |tail -$Count | head -1` cd... (7 Replies)
Discussion started by: jagadish_gaddam
7 Replies

6. UNIX for Dummies Questions & Answers

Command to display the space usage (memory usage) of a specific directory.

Hi all, Can you please tell me the command, with which one can know the amount of space a specific directory has used. df -k . ---> Displays, the amount of space allocated, and used for a directory. du -k <dir name> - gives me the memory used of all the files inside <dir> But i... (2 Replies)
Discussion started by: abhisheksunkari
2 Replies

7. Shell Programming and Scripting

usage of AWK command under perl script

i have two files as shown below t1.txt: argument1 argu2 argu37 t2.txt: 22 33 44 i want o/p as argument1 22 argu2 33 argu37 44 i am trying to merge two file under perl script using following system("paste t1.txt t2.txt | awk... (3 Replies)
Discussion started by: roopa
3 Replies

8. Shell Programming and Scripting

tail command help

Hi does anyone know how to create a file using the tail command? My book has this file I need to create and it says to use the tail command and that it is possible but I have no idea. Thanks. (4 Replies)
Discussion started by: drew211
4 Replies

9. Shell Programming and Scripting

usage of Awk command for output

Hi Experts, I have a Text file generated as below; <NAME> NEW#<technicalName><TAB> <Version> OLD#<technicalName><TAB> <Version> e.g. CH_PPV_AUDIT_DISTRIBUTOR NEW#EL_CFG_FTP_DISTRIBUTOR 2.1.0.upc2 OLD#EL_CFG_FTP_DISTRIBUTOR 2.1.0.upc1... (19 Replies)
Discussion started by: rajangupta2387
19 Replies

10. UNIX for Beginners Questions & Answers

Tail -f Command help

Hi Team, Can anyone help me here: I have to access server logs via putty and these logs file is a trailing file (continously updating) with ERROR and WARNINGS... I need to know if I can pull this trailing file to a local drive so that I can do some higlighting on some keywords through Notepad... (13 Replies)
Discussion started by: jitensetia
13 Replies

LEARN ABOUT OPENDARWIN

source

source(n)						       Tcl Built-In Commands							 source(n)

__________________________________________________________________________________________________________________________________________________

NAME

       source - Evaluate a file or resource as a Tcl script

SYNOPSIS

       source fileName

       source -rsrc resourceName ?fileName?

       source -rsrcid resourceId ?fileName?
_________________________________________________________________

DESCRIPTION

       This  command takes the contents of the specified file or resource and passes it to the Tcl interpreter as a text script.  The return value
       from source is the return value of the last command executed in the script.  If an error occurs in evaluating the contents  of  the  script
       then  the source command will return that error.  If a return command is invoked from within the script then the remainder of the file will
       be skipped and the source command will return normally with the result from the return command.

       The end-of-file character for files is '32' (^Z) for all platforms.  The source command will  read  files  up  to  this  character.   This |
       restriction  does  not  exist for the read or gets commands, allowing for files containing code and data segments (scripted documents).	If |
       you require a ``^Z'' in code for string comparison, you can use ``32'' or ``u001a'', which will be safely substituted by the Tcl  inter- |
       preter into ``^Z''.

       The -rsrc and -rsrcid forms of this command are only available on Macintosh computers.  These versions of the command allow you to source a
       script from a TEXT resource.  You may specify what TEXT resource to source by either name or id.  By default Tcl searches all open resource
       files,  which  include  the  current  application  and any loaded C extensions.	Alternatively, you may specify the fileName where the TEXT
       resource can be found.

SEE ALSO

       file(n), cd(n)

KEYWORDS

       file, script

Tcl																	 source(n)
All times are GMT -4. The time now is 05:09 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy