watch -n 1 -d "finger"

Monitoring sessions that arrive at your server


1
By: tsiqueira
2009-12-08 14:53:18

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  • change 20 by the number of sessions you want to know (20 it's fair enough) Show Sample Output


    1
    last -n 20
    jipipayo · 2009-05-26 22:09:09 1
  • Watch is a very useful command for periodically running another command - in this using mysqladmin to display the processlist. This is useful for monitoring which queries are causing your server to clog up. More info here: http://codeinthehole.com/archives/2-Monitoring-MySQL-processes.html


    48
    watch -n 1 mysqladmin --user=<user> --password=<password> processlist
    root · 2009-02-16 11:21:16 3
  • A wrapper around ssh to automatically provide logging and session handling. This function runs ssh, which runs screen, which runs script. . The logs and the screen session are stored on the server. This means you can leave a session running and re-attach to it later, or from another machine. . . Requirements: * Log sessions on a remote server * Transparent - nothing extra to type * No installation - nothing to copy to the server beforehand . Features: * Function wrapper delegating to ssh - so nothing to remember - uses .ssh/config as expected - passes your command line option to ssh * Self-contained: no scripts to install on the server * Uses screen(1), so is: - detachable - re-attachable - shareable * Records session using script(1) * Configurable log file location, which may contain variables or whitespace L="$HOME" # local variable L="\$HOME" # server variable L="some space" . Limitations: * Log dir/file may not contain '~' (which would require eval on the server) . . The sessions are named by the local user connecting to the server. Therefore if you detach and re-run the same command you will reconnect to your original session. If you want to connect/share another's session simply run: USER=bob ssh root@server . The command above is stripped down to an absolute minimum. A fully expanded and annotated version is available as a Gist (git pastebin): https://gist.github.com/flatcap/3c42326abeb1197ee714 . If you want to add timing info to script, change the command to: ssh(){ L="\$HOME/logs/$(date +%F_%H:%M)-$USER";/usr/bin/ssh -t "$@" "mkdir -p \"${L%/*}\";screen -xRRS $USER script --timing=\"$L-timing\" -f \"$L\"";} Show Sample Output


    3
    ssh(){ L="\$HOME/logs/$(date +%F_%H:%M)-$USER";/usr/bin/ssh -t "$@" "mkdir -p \"${L%/*}\";screen -xRRS $USER script -f \"$L\"";}
    flatcap · 2015-10-14 13:14:29 1
  • Useful for monitoring both MySQL and the server load at the same time.


    -6
    watch -n 1 uptime\;myqladmin --user=<user> --password=<password> --verbose processlist
    root · 2009-03-21 18:29:28 3
  • Allows you to connect to an SMTP server over TLS, which is useful for debugging SMTP sessions. (Much like telnet to 25/tcp). Once connected you can manually issue SMTP commands in the clear (e.g. EHLO) Show Sample Output


    7
    openssl s_client -starttls smtp -crlf -connect 127.0.0.1:25
    realist · 2009-08-19 08:37:24 1
  • If you have many screen sessions, it can be difficult to find the id of the one you just detached from so you can re-attach using `screen -x -S ` Show Sample Output


    -1
    screen -ls | grep D
    peter4512 · 2012-03-01 14:05:40 0

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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