Sponsored Content
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
sttmpfiles(3)						    ShapeTools Toolkit Library						     sttmpfiles(3)

NAME
stTmpFile, stRegisterFile, stUnRegisterFile, stRmRegisteredFiles - temporary files handling SYNOPSIS
#include <config.h> #include <sttk.h> char*stTmpFile (char *path); voidstRegisterFile (char *fileName); voidstUnRegisterFile (char *fileName); voidstRmRegisteredFiles (void); DESCRIPTION
stTmpFile creates a unique filename for a temporary file, registers it (see stRegisterFile below), and returns it. The return value resides in static memory and will be overwritten on the next call of stTmpFile. The temporary file is located in the /tmp directory. stRegisterFile adds the given fileName to an internal static list of file names. This list helps to keep track of the names of all tempo- rary files to be deleted until the end of the program execution. On abnormal program termination (signal), the termination handler may call stRmRegisteredFiles to delete all registered files. This avoids bogus temporary files to survive abnormal program termination. stUnRegisterFile removes fileName from the internal list of file names. It should be called when the corresponding file was removed due to the regular control flow. stRmRegisteredFiles removes all files named in the internal list set up by stTmpFile and stRegisterFile and clears the list. Bogus entries in the list (names without a correponding file) are ignored. Invoking stCatchSigs(3) causes stRmRegisteredFiles to be called on occurence of the signals SIGQUIT, SIGFPE, SIGBUS, SIGSEGV, and SIGTERM. stCleanup(3) also calls stRmRegisteredFiles. SEE ALSO
stCatchSigs(3), stCleanup(3) LIMITS
The maximum number of temporary files to be registered is 16. sttk-1.7 Thu Jun 24 17:43:36 1993 sttmpfiles(3)
All times are GMT -4. The time now is 04:44 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy