Help with scripting Post: 302634459

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Homework and Emergencies Homework & Coursework Questions Help with scripting Post 302634459 by methyl on Thursday 3rd of May 2012 11:08:50 AM

05-03-2012

Registered User

Quote:

if [ -e $file4 ]
then if (test $file4 -ot $file1 -a $file4 -ot $file2 -a $file4 -ot $file3)
then # create new HTML
else exit()
fi
else
#Code to create HTML
fi

This section of script can be simplified such that it will work whether or not the HTML file is already present and such that it creates an updated HTML if any of the input files has been changed since we last ran the script. It also gets the Here document out of the "if" test where it was not going to be created every time it should have been created.

Code:

if [ -e $file4 ]
then
          if [ $file4 -ot $file1 -o $file4 -ot $file2 -o $file4 -ot $file3 ]
          then
                 :
          else
                 exit
          fi
fi
#Code to create HTML

In this context the colon : is a "do nothing" command to avoid the syntax error caused by having a then immediately followed by an else. I'll leave you to sort out the double quotes round the string variables as per Scrutinizer's advice.

Last edited by methyl; 05-03-2012 at 12:28 PM.. Reason: logic error

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service

service(8)						      System Manager's Manual							service(8)

NAME

       service - run a System V init script

SYNOPSIS

       service SCRIPT COMMAND [OPTIONS]

       service --status-all

       service --help | -h | --version

DESCRIPTION

       service	runs a System V init script in as predictable an environment as possible, removing most environment variables and with the current
       working directory set to /.

       The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT.  The  supported  values  of  COMMAND  depend  on  the
       invoked	script.  service passes COMMAND and OPTIONS to the init script unmodified.  All scripts should support at least the start and stop
       commands.  As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the start  com-
       mand.

       service --status-all runs all init scripts, in alphabetical order, with the status command.

EXIT CODES

       service calls the init script and returns the status returned by it.

FILES

       /etc/init.d
	      The directory containing System V init scripts.

ENVIRONMENT

       LANG, TERM
	      The only environment variables passed to the init scripts.

SEE ALSO

       /etc/init.d/skeleton,
       update-rc.d(8),
       init(8),
       invoke-rc.d(8).

								     Jan 2006								service(8)