Archives for Linux
Linux: cronjob
When you setup a cronjob file (/) , the file should include the path below: PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/root/bin this is because if you don’t set the path, some command might not...
Linux: send all error to another program (PIPE)
You can use the option : 2>&1 for this purpose. 2>&1 |
Linux : Delete files older than number of days
We first need to list files that are older than number of days (5) find /Data/foldername -name *.mp4 -type f -mtime +5 -exec ls -lh {} \; If that...
Virtualbox: can’t remove / attach new hard disk
When i try to remove a disk in Virtualbox with this command: I got the following error And the fix is:
cricket – rrdcached: some info in mind
rrdcached is a daemon that receives updates to existing RRD files, accumulates them and, if enough have been received or a defined time has passed, writes the updates to...
apt-get add new data source
When we add new data: # vi /etc/ ... deb stretch main contrib non-free deb-src stretch main contrib non-free we got some errors below: # apt-get update...
How to read rrd file?
rrdtool dump rrdtool info rrdtool graph /dev/null -s 3600 DEF:ierr=:ds1:AVERAGE VDEF:ioct_a=ierr,AVERAGE PRINT:ierr:%lf this command will get the avg value of ds1 (ds1 is the dataset –...
Ubuntu 18.04 : how to run start up script
Create a service: sudo vi /etc/systemd/ Add your code there: Description=/ Compatibility ConditionPathExists=/ Type=forking ExecStart=/ start TimeoutSec=0 StandardOutput=tty RemainAfterExit=yes SysVStartPriority=99 WantedBy= Create and make sure / is executable...
Strongswan: allow client to access internet
2 sites vpn works well, they can see each other. but i want to send all internet from my remote sites to my strongswan including the internet. This need...
How to use and exit minicom ?
minicom -s (this is to configure the terminal) to exit minicom Press Ctrl – A , select Z , select X