linux:sysadmin
Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision Last revision Both sides next revision | ||
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linux:sysadmin [2016/07/12 21:19] mstraub [Network Configuration] |
linux:sysadmin [2020/07/24 13:34] mstraub [Check Open Ports & Connections] |
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| Line 242: | Line 242: | ||
| # │ │ │ │ | │ └ command | # │ │ │ │ | │ └ command | ||
| # │ │ │ │ | └───── user executing the command | # │ │ │ │ | └───── user executing the command | ||
| - | # │ │ │ │ └───────── day of week (0 - 7) (0 to 7 are Sunday to Sunday, or use names) | + | # │ │ │ │ └───────── day of week (0 - 7) (0 to 7 are Sunday to Sunday, or use names such as MON-FRI) |
| - | # │ │ │ └───────────── month (1 - 12) | + | # │ │ │ └───────────── month (1 - 12) (or names such as JAN-DEC) |
| # │ │ └───────────────── day of month (1 - 31) | # │ │ └───────────────── day of month (1 - 31) | ||
| # │ └───────────────────── hour (0 - 23) | # │ └───────────────────── hour (0 - 23) | ||
| Line 249: | Line 249: | ||
| </code> | </code> | ||
| + | [[https://crontab.guru|nifty online editor]] | ||
| ==== More crontab ==== | ==== More crontab ==== | ||
| Also possible, but not encouraged in order to not put cron jobs into too many different places and overcomplicate administration, are the following options: | Also possible, but not encouraged in order to not put cron jobs into too many different places and overcomplicate administration, are the following options: | ||
| Line 676: | Line 677: | ||
| <code bash> | <code bash> | ||
| netstat -a # print open & listening internet connections and Unix domain sockets | netstat -a # print open & listening internet connections and Unix domain sockets | ||
| - | netstat -a -t # print only tcp connections (-u for udp) | + | netstat -a -t -p # print only tcp connections (-u for udp) and the associated pid |
| netstat -s # print statistics about e.g. nr of received packets | netstat -s # print statistics about e.g. nr of received packets | ||
| netstat -r # print the kernel routing table | netstat -r # print the kernel routing table | ||
linux/sysadmin.txt · Last modified: 2020/08/20 11:59 by mstraub
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