I would like to know my below requirement can be achieved in any way in Shell Scripting? I will make this requirement of mine as understandable as I can.
Requirement:
I wrote a script 'my.script' which gets user-input tablenames and puts the same into an array. Also I get other inputs like logon credentials, Source Database name etc.
I process all the inputs to generate a 'fexp.exec' script on the fly. Then I am trying to execute the 'fexp.exec' script from 'my.script', to start the FastExport process (Teradata Utility to unload the source DB tables to the Unix environment as files). And once 'fexp.exec' script (FastExport) completes, the control returns back to the 'my.script' where I am validating the output files (created from the FastExport) based on the entered input files.
This whole effort is to automate the Unloading of tables from DB to Unix. Before writing the 'my.script', I used to prepare the 'fexp.exec' script manually and run it with a NOHUP (something like the code below), so that i can allow it to run in the background (as FastExport runs for 2 hours).
Code:
nohup ksh fexp.exec &
Question:
But now with this effort to automate, I have a requirement to run the 'fexp.exec' script from 'my.script'. And I want the 'fexp.exec' script to be run in the background. Also I do not want to make the my.script run for 2 hours as well!
I know I can just give the above line of code in my 'my.script' file to run the FastExport in the background. But I have the validation of the output files (created from FastExport) based on the entered input files, in 'my.script'. And immediately once after nohup of 'fexp.exec', the validation part in 'my.script' continues and it fails as the output files are not present as the fexp.exec is still running in the background.
To resolve this I see a few ways, but none of them are fruitful. I would need some advise on how to proceed with my condition here!
1. I can put a wait command after the nohup of fexp.exec, but that would make the my.script to wait for 2 hours, which I dont need.
2. I can nohup the my.script file itself but the script accepts user-input in various parts of the script.
3. I tried to echo the validation part into the fexp.exec script after the FastExport commands, so that I can just nohup the 'fexp.exec' and allow the my.script to run to completion once fexp.exec is nohup-ed. For this I have to pass the array that I received in my.script to fexp.exec. But that again is not working. I can post the code for this if you want.
Is there anyother way to achieve my requirement. I am sorry for writing a long story here. Hope I am not confusing anyone. Please let me know if you have any questions. Any help is very greatly appreciated.
p.s: I can post the code for the requirement or the #3 above, if anyone needs it for more understanding. i am not posting the code now just to prevent my post being toooo long
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LEARN ABOUT LINUX
script
SCRIPT(1) BSD General Commands Manual SCRIPT(1)NAME
script -- make typescript of terminal session
SYNOPSIS
script [-a] [-c COMMAND] [-e] [-f] [-q] [-t] [file]
DESCRIPTION
Script makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive
session as proof of an assignment, as the typescript file can be printed out later with lpr(1).
If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript.
Options:
-a Append the output to file or typescript, retaining the prior contents.
-c COMMAND
Run the COMMAND rather than an interactive shell. This makes it easy for a script to capture the output of a program that behaves
differently when its stdout is not a tty.
-e Return the exit code of the child process. Uses the same format as bash termination on signal termination exit code is 128+n.
-f Flush output after each write. This is nice for telecooperation: One person does `mkfifo foo; script -f foo' and another can super-
vise real-time what is being done using `cat foo'.
-q Be quiet.
-t Output timing data to standard error. This data contains two fields, separated by a space. The first field indicates how much time
elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used
to replay typescripts with realistic typing and output delays.
The script ends when the forked shell exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not
set) for the C-shell, csh(1)).
Certain interactive commands, such as vi(1), create garbage in the typescript file. Script works best with commands that do not manipulate
the screen, the results are meant to emulate a hardcopy terminal.
ENVIRONMENT
The following environment variable is utilized by script:
SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most
shells set this variable automatically).
SEE ALSO csh(1) (for the history mechanism), scriptreplay(1).
HISTORY
The script command appeared in 3.0BSD.
BUGS
Script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects.
AVAILABILITY
The script command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
Linux July 30, 2000 Linux
03-11-2010
