process_status
I needed to display process information on a status page in a dashboard. From the command line I would type something like:
$ ps -ef | grep httpd
root 3199 1 0 Sep17 ? 00:00:00 /usr/sbin/httpd
apache 3252 3199 0 Sep17 ? 00:00:00 /usr/sbin/httpd
apache 3253 3199 0 Sep17 ? 00:00:00 /usr/sbin/httpd
apache 3254 3199 0 Sep17 ? 00:00:00 /usr/sbin/httpd
apache 3255 3199 0 Sep17 ? 00:00:00 /usr/sbin/httpd
apache 3256 3199 0 Sep17 ? 00:00:00 /usr/sbin/httpd
apache 3257 3199 0 Sep17 ? 00:00:00 /usr/sbin/httpd
apache 3258 3199 0 Sep17 ? 00:00:00 /usr/sbin/httpd
apache 3259 3199 0 Sep17 ? 00:00:00 /usr/sbin/httpd
swright 10615 8615 0 14:51 pts/1 00:00:00 grep httpdThe process_status utility runs something like that with some formatting options and returns an object containing something like the following:
{ grep_str: 'httpd',
user_format: [],
pid: '3199',
pgid: '3199',
format_str: '%U%p%r%a',
processes:
[ 'root 3199 3199 /usr/sbin/httpd',
'apache 3252 3199 /usr/sbin/httpd',
'apache 3253 3199 /usr/sbin/httpd',
'apache 3254 3199 /usr/sbin/httpd',
'apache 3255 3199 /usr/sbin/httpd',
'apache 3256 3199 /usr/sbin/httpd',
'apache 3257 3199 /usr/sbin/httpd',
'apache 3258 3199 /usr/sbin/httpd',
'apache 3259 3199 /usr/sbin/httpd' ],
format_array: [ 'user', 'pid', 'pgid', 'args' ],
formatted_process_list:
[ [ 'root', '3199', '3199', '/usr/sbin/httpd' ],
[ 'apache', '3252', '3199', '/usr/sbin/httpd' ],
[ 'apache', '3253', '3199', '/usr/sbin/httpd' ],
[ 'apache', '3254', '3199', '/usr/sbin/httpd' ],
[ 'apache', '3255', '3199', '/usr/sbin/httpd' ],
[ 'apache', '3256', '3199', '/usr/sbin/httpd' ],
[ 'apache', '3257', '3199', '/usr/sbin/httpd' ],
[ 'apache', '3258', '3199', '/usr/sbin/httpd' ],
[ 'apache', '3259', '3199', '/usr/sbin/httpd' ] ] }You can then use the display the data using the processes array or for prettier output you can use the formatted_process_list array to generate a table and the format_array to generate table headers.
Usage:
/**
* Finds a process based on the grep string
*
* @param grep_str a string that will be used to grep the process list
* @param user_format an array of friendly strings that will be used to
* get string formatters from the formatters array
* @param cb callback
*/
get_status(grep_str, user_format, cb)To generate the formatted_process_list array
/**
* @param status A status object created by get_status
* @param cb A callback function
*/
process_status_data(status, cb)See the test.js file for an implementation example.