Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: exec command
Top Forums Shell Programming and Scripting exec command Post 55813 by g_s_r_c on Monday 20th of September 2004 12:04:07 PM
Old 09-20-2004
exec command
hai
i want know the difference between two shell scripts those are

1)
a=2004
echo $a #output------2004
exec < inputfile
while read line
do
echo $a #output-------2004
a=2005
echo $line
echo $a #output -------2005
done
echo $a #output------2005

2)
a=2004
echo $a #output------ 2004
while read line
do
echo $a #output------2004
a=2005
echo $line
echo $a #output-----2005
done < inputfile
echo $a #output------2004


I am produceing output in coresponding row please observe it and tell me why the difference is????????



mailny Observe the difference between last line echo $a output
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

using the -exec command

linux redhat 8.0 I am getting accustomed to using the -exec command to get around my databse.. and use it to edit and update files..! is this more apllicable than jumping from one directory to the other.. I have set up the databse so that the inode #'s are accessable and can get me from one... (0 Replies)
Discussion started by: moxxx68
0 Replies

2. UNIX for Dummies Questions & Answers

Need help with -exec cp command.

I have a ksh script that contains the following: find /dir1/dir2 -type f -name "FILE.*" -newer /dir1/dir2/afterme.txt -exec cp /dir1/dir2/dir3 {} \; When I run it from the cli, it runs fine. When I run it from the ksh script I get find: missing argument to `-exec' I also tried -exec cp... (40 Replies)
Discussion started by: bbbngowc
40 Replies

3. Shell Programming and Scripting

exec command

can any one pls explain the meaning of exec 1<&5 ?? its urgent (2 Replies)
Discussion started by: santosh1234
2 Replies

4. Shell Programming and Scripting

exec command help

All, I am using below shell script to output the content to outputfile.txt. What I am looking for is in addition to outputfile.txt, I want the output to be on standard output too. exec > outputfile.txt echo "Starting " echo "ending" (5 Replies)
Discussion started by: basic_shell
5 Replies

5. Shell Programming and Scripting

exec command

How can I use the exec command to log my korn shell session to the screen and the log file? Currently I have this command: $exec 1> ${LOG} 2>&1 This logs the output to the log file only. I want it to go to the screen also. Is this possible with this command? thanks. (10 Replies)
Discussion started by: djehresmann
10 Replies

6. UNIX for Dummies Questions & Answers

Exec command

Hi can some one explain the following command , It would really help if some can really elloborate on what is happening out here export PATH | exec /bin/sh ./auto_approve :q P.S: This is the first time i am using exec ,so an elloboration what does it do and what is the use of the :q will be... (1 Reply)
Discussion started by: Sri3001
1 Replies

7. Shell Programming and Scripting

exec command help

Hi, I have the following lines in a script : . . exec < some_file . . . I have very little idea about exec command. I would like to know what this does and what will happen if the file some_file does not exist. Specifically, I would like to know whether the lines following this... (5 Replies)
Discussion started by: elixir_sinari
5 Replies

8. Shell Programming and Scripting

Script Variables Inquiry, Values Okay in Standalone Exec, No-Show in Cron Exec

I have the following bash script lines in a file named test.sh. #!/bin/bash # # Write Date to cron.log # echo "Begin SSI Load $(date +%d%b%y_%T)" # # Get the latest rates file for processing. # d=$(ls -tr /rms/data/ssi | grep -v "processed" | tail -n 1) filename=$d export filename... (3 Replies)
Discussion started by: ginowms
3 Replies

9. Shell Programming and Scripting

Exec command - what is it doing here?

Hi all, Forgive me for asking for help with my first post, but I am struggling here. I've been asked to translate a bash script into a Windows script (probably batch or powershell, not sure yet), so the first step is obviously understand what the bash script is doing. But I have no experience in... (5 Replies)
Discussion started by: el_foz
5 Replies

10. Shell Programming and Scripting

Linux find command seems to not transmit all the result to the '-exec command'

Hello. From a script, a command for a test is use : find /home/user_install -maxdepth 1 -type f -newer /tmp/000_skel_file_deb ! -newer /tmp/000_skel_file_end -name '.bashrc' -o -name '.profile' -o -name '.gtkrc-2.0' -o -name '.i18n' -o -name '.inputrc' Tha command... (3 Replies)
Discussion started by: jcdole
3 Replies

LEARN ABOUT REDHAT

echo

ECHO(1) 								FSF								   ECHO(1)

NAME

       echo - display a line of text

SYNOPSIS

       echo [OPTION]... [STRING]...

DESCRIPTION

       NOTE:  your shell may have its own version of echo which will supercede the version described here. Please refer to your shell's documenta-
       tion for details about the options it supports.

       Echo the STRING(s) to standard output.

       -n     do not output the trailing newline

       -e     enable interpretation of the backslash-escaped characters listed below

       -E     disable interpretation of those sequences in STRINGs

       --help display this help and exit

       --version
	      output version information and exit

       Without -E, the following sequences are recognized and interpolated:

       NNN   the character whose ASCII code is NNN (octal)

       \     backslash

       a     alert (BEL)

            backspace

       c     suppress trailing newline

       f     form feed

       
     new line

       
     carriage return

       	     horizontal tab

       v     vertical tab

AUTHOR

       Written by FIXME unknown.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The  full documentation for echo is maintained as a Texinfo manual.  If the info and echo programs are properly installed at your site, the
       command

	      info echo

       should give you access to the complete manual.

GNU coreutils 4.5.3						   February 2003							   ECHO(1)
All times are GMT -4. The time now is 06:47 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy