Commands tagged monitoring (17)

  • Monitor open connections for httpd including listen, count and sort it per IP

    It's not my code, but I found it useful to know how many open connections per request I have on a machine to debug connections without opening another http connection for it. You can also decide to sort things out differently then the way it appears in here. Show Sample Output


    18
    watch "netstat -plan|grep :80|awk {'print \$5'} | cut -d: -f 1 | sort | uniq -c | sort -nk 1"
    ik_5 · 2010-03-15 09:27:43 11
  • List files accessed by a command

    Can be run as a script `ftrace` if my_command is substrituted with "$@" It is useful when running a command that fails and you have the feeling it is accessing a file you are not aware of. Show Sample Output


    17
    strace -ff -e trace=file my_command 2>&1 | perl -ne 's/^[^"]+"(([^\\"]|\\[\\"nt])*)".*/$1/ && print'
    unixmonkey8046 · 2011-08-16 15:00:18 9
  • Cheap iftop

    Shows updated status in a terminal window for connections to port '80' in a human-friendly form. Use 'watch -n1' to update every second, and 'watch -d' to highlight changes between updates. If you wish for status updates on a port other than '80', always remember to put a space afterwards so that ":80" will not match ":8080". Show Sample Output


    7
    watch 'netstat -anptu |egrep "^Proto|:80 "'
    Mozai · 2011-05-18 15:05:52 25
  • whowatch: Linux and UNIX interactive, process and users monitoring tool

    whowatch is a interactive, ncurses-based, process and users monitoring tool, which updates information in real time. This is a perfect tool for local and remote servers. It displays information about the users currently logged on to the machine, in real-time. Besides standard information (login name, tty, host, user's process), the type of the connection (ie. telnet or ssh) is shown. Display of users command line can be switch to tty idle time. Certain user can be selected and his processes tree may be viewed as well as tree of all system processes. Tree may be displayed with additional column that shows owner of each process. In the process tree mode SIGINT and SIGKILL signals can be sent to the selected process. Killing processes is just as simple and fun as deleting lines on the screen.


    4
    whowatch
    cryptema · 2011-06-30 22:45:39 6
  • Output system statistics every 5 seconds with timestamp

    See man vmstat for information about the statistics. This does the same thing without the timestamp: vmstat 5 Show Sample Output


    3
    while [ 1 ]; do echo -n "`date +%F_%T`" ; vmstat 1 2 | tail -1 ; sleep 4; done
    plasticboy · 2009-03-26 19:16:55 14
  • Monitor incoming connections of proxies and balancers.

    Maybe this will help you to monitor your load balancers or reverse proxies if you happen to use them. This is useful to discover TIME OUTS and this will let you know if one or more of your application servers is not connected by checking. Show Sample Output


    2
    watch -n 1 "/usr/sbin/lsof -p PID |awk '/TCP/{split(\$8,A,\":\"); split(A[2],B,\">\") ; split(B[1],C,\"-\"); print A[1],C[1],B[2], \$9}' | sort | uniq -c"
    ideivid · 2011-08-12 19:16:38 3
  • Monitor changed files into a log file, with day rotation, using fswatch (MacOS)

    This command monitors changes in the current folder structure (subfolders included) and files, and log it into a hidden file in the same folder, called `.file_changes_YYMMDD.log`. Modify the `--exclude` parameters to define what should be skipped. Show Sample Output


    2
    fswatch --exclude=.git/* --exclude=.settings --event-flags --event-flag-separator=\; -t -f '%Y-%m-%d %H:%M:%S' . >> ./.file_changes_$(date +"%Y-%m-%d" | sed s/-//g).log
    paulera · 2023-08-17 23:06:30 201
  • Testing ftp server status

    I must monitorize a couple of ftp servers every morning WITHOUT a port-scanner Instead of ftp'ing on 100 ftp servers manually to test their status I use this loop. It might be adaptable to other services, however it may require a 'logout' string instead of 'quit'. The file ftps.txt contains the full list of ftp servers to monitorize.


    1
    for host in $(cat ftps.txt) ; do if echo -en "o $host 21\nquit\n" |telnet 2>/dev/null |grep -v 'Connected to' >/dev/null; then echo -en "FTP $host KO\n"; fi done
    vlan7 · 2010-01-26 15:34:18 3
  • Monitor especific process with top

    You can also use different process using comma: top -p `pgrep pidgin`, `pgrep python` but you have to make sure the process exists or you'll get an error Show Sample Output


    0
    top -p `pgrep pidgin`
    cesarbustios · 2011-11-23 20:35:53 3
  • Monitoring file change while a copy

    Sometime you need to monitor file or direcory change in dimension or other attributes. This command output file (called myfile in the example) attributes in the top of the screen, updating each 1 second. You should change update time, command ( e.g., ls -all ) or target ( myfile, mydir, etc...). Show Sample Output


    0
    while true; do ls -all myfile; spleep 1; clear; done
    ivodeblasi · 2013-03-26 09:13:19 4
  • Monitoring file change while a copy


    0
    watch "ls -al myfile"
    tonk · 2013-05-08 12:40:40 5
  • Monitor open connections for httpd including listen, count and sort it per IP

    Doesn't list connections to other ports than port 80. Not f.e. 8080 or 8091. Excludes programs listening for connections, like your favorite webserver.


    0
    watch "netstat -plan | grep -v LISTEN | grep \":80 \" | awk {'print \$5'} | cut -d: -f 1 | uniq -c | sort -nk 1"
    simonsimcity · 2013-09-05 13:50:00 11
  • List user processes with their memory usage and total usage.

    Add up the amount of memory your processes are using and display the total. Replace marcanuy with your desired username. Show Sample Output


    0
    ps -u marcanuy -o pid,rss,command | awk '{print $0}{sum+=$2} END {print "Total", sum/1024, "MB"}'
    marcanuy · 2013-11-20 01:21:59 7
  • Resource Monitoring

    Monitoring system in one line : DISK : disk space MEM: memory ( mem , swap, Total) CPU : all information about cpu activity LOAD : load average Show Sample Output


    0
    echo "DISK:";df -Pl | grep -v "Filesystem" | awk '{print $5,$6}' ; echo "MEM:" ; free -mto | awk '{ print $1,$2,$3,$4 }'; echo "CPU:"; top -b -d1 -n1 | grep Cpu | awk '{print $2,$3,$4,$5,$6,$7,$8,$9}';echo "LOAD:"; cat /proc/loadavg
    injez · 2014-09-29 12:43:52 35
  • Human readable docker stats output

    Show Sample Output


    0
    docker stats --no-stream $( docker ps -q ) | sed -e "$( docker ps --format "{{.ID}} {{.Names}}" | sed -e "s/\(.*\) \(.*\)/s\/\1\/\2\t\/g;/" )"
    gtron · 2016-04-14 15:20:13 12
  • Start monitoring your server with a single curl command.

    activate the first alert and the next ones are activated automatically. Show Sample Output


    0
    curl ping.gl
    wuseman1 · 2022-10-15 13:24:45 869
  • Monitoring TCP connections number

    Monitoring TCP connections number showing each state. It uses ss instead of netstat because it's much faster with high trafic. You can fgrep specific ports by piping right before awk: watch "ss -nat | fgrep :80 | awk '"'{print $1}'"' | sort | uniq -c" Show Sample Output


    -1
    watch "ss -nat | awk '"'{print $1}'"' | sort | uniq -c"
    ricardofunke · 2012-12-07 19:07:33 8

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[vim] Clear a file in three characters (plus enter)
% selects every line in the file. 'd' deletes what's selected. It's a pretty simple combination.

shell equivalent of a boss button
Nobody wants the boss to notice when you're slacking off. This will fill your shell with random data, parts of it highlighted. Note that 'highlight' is the Perl module App::highlight, not "a universal sourcecode to formatted text converter." You'll also need Term::ANSIColor.

How to establish a remote Gnu screen session that you can re-connect to
Long before tabbed terminals existed, people have been using Gnu screen to open many shells in a single text terminal. Combined with ssh, it gives you the ability to have many open shells with a single remote connection using the above options. If you detach with "Ctrl-a d" or if the ssh session is accidentally terminated, all processes running in your remote shells remain undisturbed, ready for you to reconnect. Other useful screen commands are "Ctrl-a c" (open new shell) and "Ctrl-a a" (alternate between shells). Read this quick reference for more screen commands: http://aperiodic.net/screen/quick_reference

combining streams
2>&1 permit to combinate stdout and stderr. grep will catch stderr and stdout instead of stdout only.

doing some floating point math

Setup a persistant SSH tunnel w/ pre-shared key authentication
This creates a persistent ssh -i /path/to/key -ND local-IP:PORT User@Server connection. You may have to install autossh. -f puts in daemon mode. if you are having trouble, try it without -f.

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

Change every instance of OLD to NEW in file FILE
Very quick way to change a word in a file. I use it all the time to change variable names in my PHP scripts (sed -i 's/$oldvar/$newvar/g' index.php)

Position the cursor under the current directory line
In case you're like me and like your commands to start on clean lines, especially when you're deep into a 10-level directory tree. This can be added to .bashrc.

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

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