Erick Lumunge

In this article we discuss the who and w Linux command whose functions involve displaying of currently logged in users, useful information for Linux system administrators.

In this article we discuss the passwd command in Linux and common password management operations involving this command such as disabling, expiring, changing, warnings etc.

In this article we have covered security administration tasks performed by a Linux system administrator such as password and user accounts management, acquiring information such as user logins, logouts, failed logins, files with suid/sgid permissions etc.

In this article we cover the chage command which is used to view and modify a user's account and password information.

In this article we discuss Linux commands used to manage directories and perform operations such as listing directories, printing the current working directory, creating and removing a directory, copying a directory, moving a directory from its current location to another or renaming the directory.

The patch command reads a patch file and modifies the original file/directory as described by the instructions in the patch file which is obtained by the diff command. In this article we demonstrate how to use the patch and diff commands to update source files/directories.

Programming/debugging threaded programs has its difficulties, we don't always know how a system will schedule threads or even reproduce a behavior caused by a bug. In this article we have discussed three synchronization techniques, mutexes, semaphores and condition variables which solve such issues.

zip command allows us to create archive files and directories. In this article we discuss compressing and decompressing files among other operations that can be performed with zip on zip files such as splitting, encryption, searching, viewing etc.

In this article we discuss the rsync command which is used for copying and synchronizing files and directories both locally and remotely

gpg(Gnu Privacy Guard) is a open source command line tool for encryption and decryption, in this article we go over how to generate and revoke a key, sharing or importing this generated key and the encryption and decryption of files

nmap(Network mapper) is a Linux command line tools used to explore networks and test security. It is commonly used for security audits but can also be used by system admins for routine tasks such as monitoring hosts and services, OS and version detection, port scanning, ping sweeps etc.

In this article we discuss the strings command which is used to obtain human readable strings from unreadable files such as binaries, executables and other unreadable file formats.

In this article we discuss various Linux tools used for compression and decompression such as zip, tar, gzip, bzip2, xz. We cover commands used to compress and decompress files and directories.

The *hwloc*(Hardware Locality) is a program suite with multiple command line tools and a C API which are used for discovering hardware resources in parallel computing architectures its discovers information such as their locality, attributes, interconnection etc.

mtr is a network diagnostic tool which combines ping and traceroute functionalities into a single command. In this article we discuss commonly used commands with mtr used for troubleshooting and gathering information about networks.

In this article we have covered Linux commands that enable a user or system administrator to shutdown or reboot computer systems via the command line interface. We have also discussed how such operations can be scheduled i.e for system upgrades or maintenance.

The lsof command displays a list of all currently open files, this information is helpful especially to discover, processes currently running, services being used, ports being used, users currently on the system and much more. In this article we discuss it and commonly used commands with lsof.

The df command displays information related to file systems such as total space, used space, mount point and much more. In this article we discuss the output of this command, various options and commonly used commands using df.

In this article we covered the whereis command in Linux, which is used for locating binary files, source files and manual pages of specified commands.

The which command locates executable files associated with a given command. In this article we discuss it and cover commonly used which commands.

The rm command is used to delete files and directories in Linux. In this article we have covered commonly used commands and options used with rm to achieve its goal.

testdisk is a powerful data recovery tool, its primary function is to recover lost partitions or rebuild boot sectors using data backups, these functionalities can also be used to recover lost files in Linux. In this article we discuss how to recover such files.

The sudo command allows a user to execute command as the root user whose privileges are elevated. On the other hand su command allows one to switch to a different user with different privileges and execute commands without logging out from the current session.

The kill command is commonly used to terminate running processes, it takes the process ID or name as its arguments and sends a signal to the process and the process will act according the the sent signal.

Assuming we want to control how threads are assigned to processor cores or choose where we want to allocate data, then numactl command is right for such tasks. In this article we have discussed how to perform such actions using numactl commands.