ls command HowTo - Linux / Unix Q & A from nixCraft

Linux / Unix: Sort ls Command Output By Last Modified Date and Time

last updated July 26, 2017 in BASH Shell, Commands, Linux, UNIX

I download lots of files in ~/Downloads/ folder in Ubuntu Linux and OS X desktop. How do I show last downloaded file first using the ls command? How do I sort the output of ls command by last modified date?

FreeBSD 9.1: HowTo Load a Kernel Module

last updated July 29, 2013 in FreeBSD, Hardware, UNIX

I am a new FreeBSD Unix users. I am using FreeBSD version 9.1 and how do I load a kernel module called drm using command line option?

Ubuntu Linux: Install Latest Oracle Java 7

last updated May 16, 2013 in Package Management, Ubuntu Linux

I am a network admin who recently made the switch from MS-Windows to Ubuntu Linux. I need to use Java and Firefox web browser plugin to run java applet. I am unable to access many devices such as Firewall appliance, LBS/VPX, and network equipments due to Ubuntu’s incompatible openjdk and icedtea plugin. I also searched software center but unable to find Oracle Java 7. How do I install Oracle Java 7 and get rid of this incompatibility problems on Ubuntu Linux amd64 v12.04 LTS or v13.04+?

Bash: .* Considered Harmful To Match Dot Files. Why?

last updated April 25, 2013 in BASH Shell, Linux, Troubleshooting, UNIX

How do I match dot files under Unix / Linux using bash shell? Why .* considered as harmful when matching dot files under bash shell?

RHEL / CentOS: SELinux Is Preventing /sbin/iptables-multi-1.4.7 From Read Access On The File/rawip_socket

last updated March 10, 2013 in RedHat and Friends, Troubleshooting

I upgraded my system to RHEL/CentOS v6.4 and I am getting the following error for 3rd party packages such as Shorewall and fail2ban:

Mar 10 03:43:56 b2 setroubleshoot: SELinux is preventing /sbin/iptables-multi-1.4.7 from read access on the file . For complete SELinux messages. run sealert -l dea027a2-81dd-4394-96d4-f0d1160c9307
Mar 10 03:43:56 b2 setroubleshoot: SELinux is preventing /sbin/iptables-multi-1.4.7 from create access on the rawip_socket . For complete SELinux messages. run sealert -l 08757ff1-a08d-4c06-a08b-ff5d53712305
Mar 10 03:43:56 b2 setroubleshoot: SELinux is preventing /sbin/iptables-multi-1.4.7 from read access on the file . For complete SELinux messages. run sealert -l dea027a2-81dd-4394-96d4-f0d1160c9307
Mar 10 03:43:56 b2 setroubleshoot: SELinux is preventing /sbin/iptables-multi-1.4.7 from create access on the rawip_socket . For complete SELinux messages. run sealert -l 08757ff1-a08d-4c06-a08b-ff5d53712305
Mar 10 03:43:56 b2 setroubleshoot: SELinux is preventing /sbin/iptables-multi-1.4.7 from read access on the file . For complete SELinux messages. run sealert -l dea027a2-81dd-4394-96d4-f0d1160c9307

How do I fix this problem?

Ubuntu Linux: Concatenate Text Files Command

last updated April 27, 2013 in Debian / Ubuntu, Ubuntu Linux

How do I concatenates the text files called first.doc and second.doc and writes the result to final.doc under Ubuntu Linux operating systems?

Linux ls Command Sort Files By Size

last updated January 13, 2019 in Debian / Ubuntu, Linux, RedHat and Friends, UNIX

How do I sort all *.avi or *.py files in $HOME/Download/ directory by file size using Linux ls command line utility? How do I list all files ordered by size in Linux using ls command?