I wanted to update WordPress core version and all plugins every week, so for this I install WP-CLI on my WordPress installed server.

So, for doing this I wrote wp-cli command in Linux shell script as follows,

#! /bin/bash
cd /path to the WordPress installation
/path to the wp --path=/path to the WordPress installation core update

Also, created crontab entry as follows,

30 7 * * * /path to the shell script file > /path to the txt file (which store the output) 2>&1

However, When crontab execute the shell script then I get output as follows,

Warning: fwrite() expects parameter 1 to be resource, string given in phar:///usr/local/bin/wp/php/WP_CLI/Loggers/Base.php on line 61

My PHP Version is,

PHP 5.6.30 (cli) (built: Apr 28 2017 13:36:21) Copyright (c) 1997-2016 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies with the ionCube PHP Loader (enabled) + Intrusion Protection from ioncube24.com (unconfigured) v5.1.1, Copyright (c) 2002-2016, by ionCube Ltd. with Zend Guard Loader v3.3, Copyright (c) 1998-2014, by Zend Technologies

wp info is,

PHP binary: /usr/local/bin/php PHP version: 5.6.30 php.ini used: /usr/local/lib/php.ini WP-CLI root dir:
phar://wp-cli.phar WP-CLI vendor dir: phar://wp-cli.phar/vendor WP_CLI phar path: /home/staginglatinmark WP-CLI packages dir: WP-CLI global config: WP-CLI project config: WP-CLI version: 1.4.1

Note:- 1) When I execute the shell script manually then it works properly.

2) I am using Linux Red-hat O.S.

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