The method of automatically adding crontab to script

This article mainly explains the "script automatically add crontab writing method", the article explains the content is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "script automatically add crontab writing method" bar!

The code is as follows:

#! / bin/sh

BASEDIR= `dirname $0` /..

BASEDIR= `(cd "$BASEDIR"; pwd)`

PROGRAM=$BASEDIR/bin/daemon.sh

CRONTAB_CMD= "* / 1 * sh $PROGRAM once > / dev/null 2 > & 1 &"

(crontab-l 2 > / dev/null | grep-Fv $PROGRAM; echo "$CRONTAB_CMD") | crontab-

COUNT= `crontab-l | grep $PROGRAM | grep-v "grep" | wc-l `

If [$COUNT-lt 1]; then

Echo "fail to add crontab $PROGRAM"

Exit 1

Fi

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