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Full Discussion: Can run a ".sh" script as the user but not from the crontab
Top Forums Shell Programming and Scripting Can run a ".sh" script as the user but not from the crontab Post 302351513 by bakunin on Tuesday 8th of September 2009 08:08:34 PM
Old 09-08-2009
You are falling for "scripting error number 1": you depend on an environment, which cannot be taken for granted.

Long form: a construct like "./runapp.sh" is telling the shell to execute a program located in the CURRENT directory (the "./" part of the path). This might be the case if you are logged in as your user and manually changed to this directory before. This is NOT the case when cron tries to execute your script, because cron doesn't know that it should manually change into a certain directory first.

Avoid relative paths (everything starting with a "./" in scripts.

Additionally i wonder why the rest of the script worked at all. A command like "ps" is basically an executable and probably located in "/usr/bin/ps". Without a PATH variable pointing to /usr/bin ps shouldn't be found at all. This is also relying on an environment which is probably not set.

In scripts you better set ALWAYS your own environment, because this way you will never encounter problems like these. Here is a sketch of what i mean:

Code:
#!/bin/ksh
# Example script

# ----------------- global environment
PATH=/usr/bin:/usr/sbin:<and whatever you need>
export PATH
TERM=vt100
export TERM
# ..... similar for whatever you might also need in your script .....

# -----------------  constants
BINDIR=/path/to/my/scripts
# ..... similar for whatever you might also need in your script .....

# -----------------  script code itself
m=`ps -ef | grep /install/new/application | wc -l`
if [ $m != 2 ] ; then
     echo "starting application"
     $BINDIR/runapp.sh
else
     echo "no action taken"
fi

exit 0

Another (minor) observation: if you use ksh do NOT use "echo" for output. There is the built-in "print" command for that, whereas "echo" is an external command.

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
RavinderSingh13
 

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LEARN ABOUT NETBSD

dh_installdebconf

DH_INSTALLDEBCONF(1)                                                 Debhelper                                                DH_INSTALLDEBCONF(1)

NAME

       dh_installdebconf - install files used by debconf in package build directories

SYNOPSIS

       dh_installdebconf [debhelperoptions] [-n] [--params]

DESCRIPTION

       dh_installdebconf is a debhelper program that is responsible for installing files used by debconf into package build directories.

       It also automatically generates the postrm commands needed to interface with debconf. The commands are added to the maintainer scripts by
       dh_installdeb. See dh_installdeb(1) for an explanation of how that works.

       Note that if you use debconf, your package probably needs to depend on it (it will be added to ${misc:Depends} by this program).

       Note that for your config script to be called by dpkg, your postinst needs to source debconf's confmodule. dh_installdebconf does not
       install this statement into the postinst automatically as it is too hard to do it right.

FILES

       debian/package.config
           This is the debconf config script, and is installed into the DEBIAN directory in the package build directory.

           Inside the script, the token #DEBHELPER# is replaced with shell script snippets generated by other debhelper commands.

       debian/package.templates
           This is the debconf templates file, and is installed into the DEBIAN directory in the package build directory.

       debian/po/
           If this directory is present, this program will automatically use po2debconf(1) to generate merged templates files that include the
           translations from there.

           For this to work, your package should build-depend on po-debconf.

OPTIONS

       -n, --no-scripts
           Do not modify postrm script.

       -- params
           Pass the params to po2debconf.

SEE ALSO

       debhelper(7)

       This program is a part of debhelper.

AUTHOR

       Joey Hess <joeyh@debian.org>

11.1.6ubuntu2                                                       2018-05-10                                                DH_INSTALLDEBCONF(1)
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