Can anyone help me with a shell scripting resume draft or sample Post: 302922636

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Top Forums UNIX for Dummies Questions & Answers Can anyone help me with a shell scripting resume draft or sample Post 302922636 by Corona688 on Monday 27th of October 2014 11:43:50 AM

10-27-2014

Registered User

Quote:

Originally Posted by walterpeter

Hello members,

Can anyone help me how to draft a shell scripting resume. This might sound off the track from the forum's technical discussion but am struggling to find it on google how to do it exactly. Hence asking for help over here since there are many good number of professionals here.

-thanks in advance
walter

You mean, a script which can resume from a point? We get asked this a lot.

Last time I suggested a script like this:

Code:

STEP=0

[ -f /tmp/stepfile ] && read STEP < /tmp/stepfile

while true
do
        # Init section -- set up variables and stuff #
        ##############################
        # Resume happens here

        case "$STEP" in
        0)      first_program_statement
                ;;
        1)      second_program_statement
                ;;
        *)      echo "Finished all statements -- all done" >&2
                break
                ;;
        esac

        if [ "$?" -ne 0 ]
        then
                 echo "Failure on step $STEP" >&2
                 exit 1
        fi
        let STEP=STEP+1
        echo "$STEP" > /tmp/stepfile
done

echo "all done" >&2
rm -f /tmp/stepfile

This depends on first_program_statement, second_program_statement, etc leaving a useful return code in $? so be careful not to run statements after it which mess it up. (Before is okay.) Also remember that variables aren't saved between executions.

Last edited by Corona688; 10-27-2014 at 12:51 PM..

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systemd-hibernate-resume-generator

SYSTEMD-HIBERNATE-RESUME-GENERATOR(8)                   systemd-hibernate-resume-generator                   SYSTEMD-HIBERNATE-RESUME-GENERATOR(8)

NAME

       systemd-hibernate-resume-generator - Unit generator for resume= kernel parameter

SYNOPSIS

       /lib/systemd/system-generators/systemd-hibernate-resume-generator

DESCRIPTION

       systemd-hibernate-resume-generator is a generator that instantiates systemd-hibernate-resume@.service(8) unit according to the value of
       resume= parameter specified on the kernel command line.

KERNEL COMMAND LINE

       systemd-hibernate-resume-generator understands the following kernel command line parameters:

       resume=
           Takes a path to the resume device. Both persistent block device paths like /dev/disk/by-foo/bar and fstab(5)-style specifiers like
           "FOO=bar" are supported.

SEE ALSO

       systemd(1), systemd-hibernate-resume@.service(8), kernel-command-line(7)

systemd 237                                                                                                  SYSTEMD-HIBERNATE-RESUME-GENERATOR(8)

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