11-05-2009
Running a unix script(which is calling another script inside that) in background
Hi all,
I am having a script ScriptA which is calling a script ScriptB in the same server and copying files to second server and have to execute one script ScriptC in the second server. THis First script ScriptA is the main script and i have to execute this process continously.
for Keeping this script as background how is it possible.?????
The Script A is having scp command and ScriptB is using SSH command and Script A is continously watching for events in ServerA. SO for running this continous looop which is using all these 3 scripts what is the method. I have tried nohup . but in that all the 3 scripts i have to do nohup ??? Crontab ?? i have tried but was not able to do the required result. i m using expect for sending password in scp and if i execute in background it is exiting and scripts are not functioning.
Please Help me out for solving this issue Unix Experts.
Thanking you all in advance
Regards,
Rohith G
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nohup(1) General Commands Manual nohup(1)
NAME
nohup - run a command immune to hangups
SYNOPSIS
command [arguments]
DESCRIPTION
executes command with hangups and quits ignored. If output is not redirected by the user, both standard output and standard error are sent
to If is not writable in the current directory, output is redirected to otherwise, fails. If a file is created, the file's permission bits
will be set to
If output from is redirected to a terminal, or is not redirected at all, the output is sent to
EXTERNAL INFLUENCES
Environment Variables
determines the language in which messages are displayed.
If is not specified in the environment or is set to the empty string, the value of is used as a default for each unspecified or empty vari-
able. If is not specified or is set to the empty string, a default of "C" (see lang(5)) is used instead of
If any internationalization variable contains an invalid setting, behaves as if all internationalization variables are set to "C". See
environ(5).
International Code Set Support
Single- and multi-byte character code sets are supported.
EXAMPLES
It is frequently desirable to apply to pipelines or lists of commands. This can be done only by placing pipelines and command lists in a
single file, called a shell script. To run the script using
features apply to the entire contents of file. If the shell script file is to be executed often, the need to type can be eliminated by
setting execute permission on file. The script can also be run in the background with interrupts ignored (see sh(1)):
file typically contains normal keyboard command sequences that one would want to continue running in case the terminal disconnects, such
as:
WARNINGS
Be careful to place punctuation properly. For example, in the command form:
applies only to command1. To correct the problem, use the command form:
Be careful of where standard error is redirected. The following command may put error messages on tape, making it unreadable:
whereas
puts the error messages into file
EXIT STATUS
The following exit values are returned:
The command specified by
command was found but could not be invoked
An error occurred in the nohup utility or the specified
command could not be found
Otherwise, the exit status of nohup will be that of the command specified.
SEE ALSO
chmod(1), nice(1), sh(1), signal(5).
STANDARDS CONFORMANCE
nohup(1)