Bash Shell Generate Random Numbers - nixCraft
How do I create or generate random numbers (sequence of numbers that lack any pattern), under Bash shell? The bash shell offers $RANDOM variable (it also works with ksh). From the bash man page: Each time this is referenced, a random integer between 0 and 32767 is generated. The sequence of random numbers may be initialized by assigning a value to RANDOM. If RANDOM is unset, it loses its special p
RHEL 6/7/8 - semanage SELinux Command Not Found - nixCraft
I‘m trying to use semanage command to configure certain elements of SELinux policy without requiring modification to or recompilation from policy sources under RHEL 6 server. But, I’m not able to find out this command and/or package name. How do I install semanage command under RedHat Enterprise Linux? This page shows how to install semanage command on RHEL version 6/7/8 using the yum command when
10 Tools To Add Some Spice To Your UNIX/Linux Shell Scripts - nixCraft
🐧 nixCraft → Linux → 10 Tools To Add Some Spice To Your UNIX/Linux Shell Scripts There are some misconceptions that shell scripts are only for a CLI environment. You can efficiently use various tools to write GUI and network (socket) scripts under KDE or Gnome desktops. Shell scripts can make use of some of the GUI widget (menus, warning boxes, progress bars, etc.). You can always control the fin
Configuring Linux Static DHCP Clients by Sending Host Name - nixCraft
🐧 nixCraft → Howto → CentOS → Configuring Linux Static DHCP Clients by Sending Host Name Q. My DHCP server configured to assign static IPs to few Debian / Ubuntu Linux boxes using hostnames. My Windows 2000 and XP client computer sends hostname automatically. How do I send my hostname under Linux using dhcp client? A. By default, the DHCP server requests the subnet-mask, broadcast-address, time-o
Linux ultra fast command line download accelerator - nixCraft
Usually I use wget, which is ultimate command line downloader. However, wget failed to accelerate my download speed. I was downloading 1.4GB file around 800KB/s download speed (this box is hooked to uplink port speed 10 Mbps ). However, remote server was restricting me. Therefore, I decided to get rid of wget. I have downloaded axel – a light download accelerator for Linux command line. How Axel w
Can I run fsck or e2fsck when Linux file system is mounted? - nixCraft
Q. Can I run fsck or e2fsck command when Linux file system is mounted? Do you advice to run fsck on a live file system? I am using Cent OS. A. No. Do not run fsck on a live or mounted file system. fsck is used to check and optionally repair one or more Linux file systems. Running fsck on a mounted filesystem can usually result in disk / data corruption. So please do not do it. You have two choices
Linux Start Restart and Stop The Cron or Crond Service
Commands for RHEL/Fedora/CentOS/Scientific/Rocky/Alma Linux user If you are using Redhat (RHEL)/Fedora/CentOS/Rocky/Alma Linux use the following commands. Task: Start cron service To start the cron service, use: # /etc/init.d/crond start OR RHEL/CentOS 5.x/6.x user: # service crond start OR RHEL/Centos Linux 7.x user: # systemctl start crond.service Task: Stop cron service To stop the cron service
Postfix Forward Email To Another Email Account - nixCraft
I‘ve multiple virtual domain hosted on CentOS Postfix server. How do I forward selected virtual domain email to yahoo / gmail or other email account using Postfix email server? Postfix can be configured as mail forwarding domains server using virtual_alias_maps settings. There are two type of configurations here. Postfix Mail Forwarding Domains This is useful if you do not have local mailboxes and
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This quick tutorial explains How to check the SHA1 hash of a file on Linux, FreeBSD, and Unix-like systems using the sha1sum or sha1 command. [continue reading…] This quick tutorial explains how to install and set up OpenSSH (SSHD) server and client on the Alpine Linux system. Further, you will learn how to build a Docker Linux container running sshd server based upon Alpine Linux image too. [cont
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