Linux command-line notes and practical examples for everyday administration, troubleshooting, and shell work.
wget is useful when you need to download files from a web directory or mirror a simple documentation page for offline use. Example This command recursively downloads the linked page and the files needed to view it locally: Options used -r or –recursive: enable recursive download. –level=1: limit recursion depth to one level. -k or … Read more
In vi or vim, you can comment a range of lines by using a substitution command. This is handy when editing shell scripts, configuration files or temporary notes. Comment every line in the file Open the file in vi, press Esc, then run: This adds # at the start of every line. Use a different … Read more
scp copies files between local and remote systems over SSH. Copy a local file to a remote server Copy a remote file to the local machine Copy a directory recursively For newer workflows, rsync is often better for large folders or repeated transfers, but scp is still useful for quick secure copies.
ssh is the standard command-line tool for logging in to a remote Linux or Unix system securely. Basic login Replace user with the remote username and example.com with the server name or IP address. Use a different port Run a remote command This is useful for quick checks without opening a full interactive shell.
A modern note on the legacy Telnet protocol, why it should not be used for remote administration, and safer alternatives such as SSH.
Practical netstat examples for checking listening ports, processes and routing information on Linux.
Quick ipcalc examples for checking subnet, netmask, broadcast and host range details.
A short screen tutorial for keeping shell sessions running after disconnecting.
A short practical note on using umask to control default file and directory permissions in Linux.
Practical lsattr examples for checking extended Linux file attributes such as immutable files.