Learn about the ability to send messages to user terminals.
- [Instructor] Hi, and welcome…to the next video of the last section.…Sending Messages to User Terminals…In the previous video, we've learned about killing processes…and send or respond to signals.…A system administrator may need to send messages…to the terminal of every user or a specified user…on all machines over a network.…This video is a guide on how to perform this task.…Wall is a command that is used to write…messages on the terminals of all logged in users.…
It can used to convey messages to all logged in users…on a server or multiple access machines.…Sending messages to all users…may not be useful at all times.…Terminals are treated as devices in a Linux system…and hence these open terminals will have…a corresponding device node file…at slash dev slash P-T-S.…Writing data to a specific device…will display messages on the corresponding terminal.…In order to broadcast a message…to all users and all logged in terminals, use…The message outline will show who sent the message,…which user and which host.…
It is noteworthy that the message gets displayed…
Sarath Lakshman
Shantanu Tushar
Released
7/17/2017Note: This course was created by Packt Publishing. We are pleased to host this training in our library.
- Printing in the terminal
- Performing math in the Linux shell
- Getting and setting dates
- Working with functions and arguments
- Reading output
- Making comparisons
- Concatenating text
- Finding, editing, generating, and deleting files
- Running parallel processes
- Using regular expressions
- Downloading webpages
- Parsing data from a website
- Finding broken links
- Backing up and archiving
- Transferring files and data through the network
- Monitoring your Linux system
- Gathering data for system administration
Skill Level Intermediate
Duration
Views
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1. Shell Something Out
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Printing in the terminal6m 4s
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Math with the shell3m 5s
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Visiting aliases2m 25s
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Debugging the script2m 46s
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Functions and arguments4m 31s
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Comparisons and tests6m 22s
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2. Have a Good Command
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Concatenating with cat5m 30s
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Finding files and file listing18m 46s
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Playing with xargs11m 41s
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Translating with tr6m 51s
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Checksum and verification4m 46s
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Splitting files and data4m 53s
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Automating interactive input4m 10s
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3. File In, File Out
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Generating files of any size4m 24s
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Making files immutable2m 13s
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Using loopback files6m 15s
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Printing the directory tree3m 18s
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4. Texting and Driving
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Using regular expressions9m 25s
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5. Tangled Web? Not at All
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Downloading from a web page5m 15s
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A primer on cURL7m 11s
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Image crawler and downloader3m 36s
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Web photo album generator1m 54s
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6. The Backup Plan
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Archiving with tar10m 33s
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Archiving with cpio2m 31s
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Compressing data with gzip5m 27s
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Faster archiving with pbzip23m 15s
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Backup snapshots with rsync6m 55s
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7. The Old-Boy Network
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Let us ping4m 53s
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Creating arbitrary sockets2m 45s
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8. Put on the Monitor's Cap
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Logging with syslogd2m 44s
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Monitoring disk activity1m 41s
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9. Administration Calls
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Gathering system information1m 57s
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Scheduling with cron7m 7s
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User administration script5m 16s
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Video: Sending messages to user terminals