10-24-2018
Quote:
Originally Posted by
rohit_shinez
what if script_1.sh fails then if i rerun the main_script.sh it should run only script_1.sh . For eg script_1.sh fails on 25th and re-running on 26th in that case script_1.sh will not run and other script_2.sh will also run which would have completed being daily job
I suggest reading up on the
test- command (this is effectively what
[..] is). You have many possibilities to formulate various conditions on when and when not to run a script, you just need to implement them. It is far easier and in the long run less time-consuming for you to learn that (takes about 10 minutes) than to ask over and over again like you are doing now.
But first you should define what "script fails" means: does it exit with a non-zero return code? Does it write a log with an error message? Does it (not) produce a file? The secret of writing good scripts is to first make up your mind what
exactly you want to do and under which conditions, then to define
exactly what it is you want to do: "i need a file today" is less exact than "i need a file every second friday of the month" and this in turn is less exact than "i need a file every second friday only if this other file is up to date execpt for ....". Nobody here knows what you need as well as you do, so do your work first and we will gladly help with the rest.
I hope this helps.
bakunin
Last edited by bakunin; 10-24-2018 at 07:23 AM..
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LEARN ABOUT DEBIAN
shell-quote
SHELL-QUOTE(1p) User Contributed Perl Documentation SHELL-QUOTE(1p)
NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$SHELL -c". This doesn't work as intended:
ssh host touch 'hi there' # fails
It creates 2 files, hi and there. Instead, do this:
cmd=`shell-quote touch 'hi there'`
ssh host "$cmd"
This gives you just 1 file, hi there.
process find output
It's not ordinarily possible to process an arbitrary list of files output by find with a shell script. Anything you put in $IFS to
split up the output could legitimately be in a file's name. Here's how you can do it using shell-quote:
eval set -- `find -type f -print0 | xargs -0 shell-quote --`
debug shell scripts
shell-quote is better than echo for debugging shell scripts.
debug() {
[ -z "$debug" ] || shell-quote "debug:" "$@"
}
With echo you can't tell the difference between "debug 'foo bar'" and "debug foo bar", but with shell-quote you can.
save a command for later
shell-quote can be used to build up a shell command to run later. Say you want the user to be able to give you switches for a command
you're going to run. If you don't want the switches to be re-evaluated by the shell (which is usually a good idea, else there are
things the user can't pass through), you can do something like this:
user_switches=
while [ $# != 0 ]
do
case x$1 in
x--pass-through)
[ $# -gt 1 ] || die "need an argument for $1"
user_switches="$user_switches "`shell-quote -- "$2"`
shift;;
# process other switches
esac
shift
done
# later
eval "shell-quote some-command $user_switches my args"
OPTIONS
--debug
Turn debugging on.
--help
Show the usage message and die.
--version
Show the version number and exit.
AVAILABILITY
The code is licensed under the GNU GPL. Check http://www.argon.org/~roderick/ or CPAN for updated versions.
AUTHOR
Roderick Schertler <roderick@argon.org>
perl v5.8.4 2005-05-03 SHELL-QUOTE(1p)