The locate command in Linux searches for files and directories by name. It queries a pre-built database instead of scanning the filesystem…
Most modern Linux distributions use systemd as the default service manager. Knowing how to list running services and check their…
Truncating a file in Linux means removing its contents while leaving the file itself in place. The file keeps its…
The ss command in Linux lists open sockets and active network connections. It replaced the deprecated netstat command and is available by default on…
The ftp command in Linux connects to a remote FTP server and transfers files. FTP transmits everything in plain text: credentials and…
The lsmod command in Linux lists all currently loaded kernel modules. It reads /proc/modules — a virtual file maintained by the kernel — and…
The rename command in Linux renames multiple files at once using Perl regular expressions. Unlike mv, which handles one file at a time, rename applies…
The pgrep command in Linux finds the PIDs of running processes based on a name or other criteria. It is part of…
The unlink command in Linux removes a single file by deleting its directory entry. It is a thin wrapper around the unlink() POSIX system…
When troubleshooting a network connection or configuring a firewall, the first question is whether a port is actually reachable. This…