daily, weekly,andmonthlyjobs. If you want to edit the system crontab, you can open it using an editor likenano. The command for that would be as shown below. Note that you must be a root user to access the crontab file.
last View user login log cut -d: -f1 /etc/passwd View all users of the system cut -d: -f1 /etc/group View all groups in the system crontab -l View the current user's scheduled tasks <> <> service : Command description # chkconfig –list List all system services `# chkconfig –...
To clear the cache at a specific time, add the following line to the crontab file: 30 3 * * * sudo sync; echo 3 > /proc/sys/vm/drop_caches 1 30 3 * * * sudo sync; echo 3 > /proc/sys/vm/drop_caches This will clear the cache (including PageCache, dentries, and inodes...
Re: How to measure the server's availability ? Run this script every hour using crontab:---#!/bin/sh HOSTLST=/tmp/svr.lstTMP_FILE=/tmp/svr.tmpMAILLST="root, sysadm" for host in $(cat $HOSTLST) do ping $host -n 1 | grep -q '1 packets received' if [ $? = 0 ] ...
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crontab -e It opens the default editor. Add this at the last line. 15 6 * * 0 /PATH-TO/checkcerts.sh 2>&1 Save and quit. The next Sunday at 6:15am, you should get an email with the expiry date of all the domains using Let's Encrypt SSL certificates in your server. ...
1. Overwrite View Group Class In this section, we’ll override a view group class, and implement a simple wrap layout logic. In order to get the size of child, measure should be called with proper argument first, then getMeasuredWidth and getMeasuredHeight can return the proper value. ...
Question: How do I view or extract the files that are bundled inside the packages of various operating system. For example, I would like to know how to view (and extract) the content of a rpm, or deb, or depot, or msi file. Answer: You can use tools like
while theatcommand enables you to specify one-time actions to be performed at a desired time. For instance, you could utilizecrontabto schedule a daily backup at 2 a.m., ensuring repetitive execution. Conversely, you could use theatcommand to create a reminder for a later appointment within...
However, this doesn't help if you want to schedule a task to run just once. Sure, you canset it up in cron , but then you have to remember to go back and remove thecrontab entryafter the task executes, which is inconvenient.