Commands using ps (301)

  • Display the top ten running processes - sorted by memory usage

    ps returns all running processes which are then sorted by the 4th field in numerical order and the top 10 are sent to STDOUT. Show Sample Output


    107
    ps aux | sort -nk +4 | tail
    root · 2009-01-23 17:12:33 9
  • Find the process you are looking for minus the grepped one

    As an alternative to using an additional grep -v grep you can use a simple regular expression in the search pattern (first letter is something out of the single letter list ;-)) to drop the grep command itself. Show Sample Output


    72
    ps aux | grep [p]rocess-name
    olorin · 2009-08-13 05:44:45 9
  • Show a 4-way scrollable process tree with full details.

    If you want a visual representation of the parent/child relationships between processes, this is one easy way to do it. It's useful in debugging collections of shell scripts, because it provides something like a call traceback. When a shell script breaks, just remember "awwfux".


    45
    ps awwfux | less -S
    ToyKeeper · 2009-07-04 09:39:28 4
  • processes per user counter

    awk is evil! Show Sample Output


    22
    ps hax -o user | sort | uniq -c
    buzzy · 2010-04-29 10:43:03 4
  • Search for a process by name

    ps and grep is a dangerous combination -- grep tries to match everything on each line (thus the all too common: grep -v grep hack). ps -C doesn't use grep, it uses the process table for an exact match. Thus, you'll get an accurate list with: ps -fC sh rather finding every process with sh somewhere on the line. Show Sample Output


    14
    ps -fC PROCESSNAME
    pooderbill · 2015-04-20 13:09:44 2
  • Sort all running processes by their memory & CPU usage

    you can also pipe it to "tail" command to show 10 most memory using processes. Show Sample Output


    13
    ps aux --sort=%mem,%cpu
    mrwill · 2009-10-10 22:48:51 0
  • grep processes list avoiding the grep itself

    Trick to avoid the form: grep process | grep - v grep Show Sample Output


    13
    ps axu | grep [a]pache2
    ebah80 · 2012-12-15 19:37:19 6
  • Grep without having it show its own process in the results

    The trick here is to use the brackets [ ] around any one of the characters of the grep string. This uses the fact that [?] is a character class of one letter and will be removed when parsed by the shell. This is useful when you want to parse the output of grep or use the return value in an if-statement without having its own process causing it to erroneously return TRUE. Show Sample Output


    12
    ps aux | grep "[s]ome_text"
    SiegeX · 2009-02-17 02:10:50 1
  • Discover the process start time

    That is useful to discover the start time of process older than 1 day. You can also run: ls -ld /proc/PID That's returning the creation date of the proc files from the process. Some users reported that this way might show you a wrong date since any other process like cron, for example, could change this date. Show Sample Output


    12
    ps -eo pid,lstart,cmd
    kruspemsv · 2013-06-17 12:52:53 0
  • Exclude grep from your grepped output of ps (alias included in description)

    Surround the first letter of what you are grepping with square brackets and you won't have to spawn a second instance of grep -v. You could also use an alias like this (albeit with sed): alias psgrep='ps aux | grep $(echo $1 | sed "s/^\(.\)/[\1]/g")'


    10
    ps aux | grep [h]ttpd
    abcde · 2009-02-10 02:59:20 2
  • Click on a GUI window and show its process ID and command used to run the process

    This command is useful when you want to know what process is responsible for a certain GUI application and what command you need to issue to launch it in terminal. Show Sample Output


    9
    xprop | awk '/PID/ {print $3}' | xargs ps h -o pid,cmd
    jackhab · 2009-02-16 07:55:19 2
  • Processes by CPU usage


    9
    ps -e -o pcpu,cpu,nice,state,cputime,args --sort pcpu | sed "/^ 0.0 /d"
    fbparis · 2009-03-07 16:47:10 5
  • View Processeses like a fu, fu

    I don't truly enjoy many commands more than this one, which I alias to be ps1.. Cool to be able to see the heirarchy and makes it clearer what need to be killed, and whats really going on. Show Sample Output


    8
    command ps -Hacl -F S -A f
    AskApache · 2009-08-19 07:08:19 0
  • cpu and memory usage top 10 under Linux

    The original version gives an error, here is the correct output


    7
    ps -eo user,pcpu,pmem | tail -n +2 | awk '{num[$1]++; cpu[$1] += $2; mem[$1] += $3} END{printf("NPROC\tUSER\tCPU\tMEM\n"); for (user in cpu) printf("%d\t%s\t%.2f\t%.2f\n",num[user], user, cpu[user], mem[user]) }'
    georgz · 2009-10-29 12:49:01 0
  • easily strace all your apache processes

    This one-liner will use strace to attach to all of the currently running apache processes output and piped from the initial "ps auxw" command into some awk. Show Sample Output


    7
    ps auxw | grep sbin/apache | awk '{print"-p " $2}' | xargs strace
    px · 2011-03-14 21:45:22 7
  • See how many % of your memory firefox is using


    6
    ps -o %mem= -C firefox-bin | sed -s 's/\..*/%/'
    susannakaukinen · 2009-03-06 21:09:26 1
  • Find the process you are looking for minus the grepped one

    preferred way to query ps for a specific process name (not supported with all flavors of ps, but will work on just about any linux afaik) Show Sample Output


    6
    ps -C command
    recursiverse · 2009-08-14 15:30:42 1
  • processes per user counter

    enumerates the number of processes for each user. ps BSD format is used here , for standard Unix format use : ps -eLf |awk '{$1} {++P[$1]} END {for(a in P) if (a !="UID") print a,P[a]}' Show Sample Output


    6
    ps aux |awk '{$1} {++P[$1]} END {for(a in P) if (a !="USER") print a,P[a]}'
    benyounes · 2010-04-28 15:25:18 0
  • Find the process you are looking for minus the grepped one

    faster ;) but your idea is really cool


    6
    ps -ef | grep c\\ommand
    ioggstream · 2011-01-04 11:43:14 0
  • Cleanup Docker

    # Delete all containers docker rm $(docker ps -a -q) # Delete all images docker rmi $(docker images -q)


    6
    sudo docker rm $(docker ps -a -q); sudo docker rmi $(docker images -q)
    lpalgarvio · 2015-05-20 12:34:40 0
  • ps with parent/child process tree

    Shows a tree view of parent to child processes in the output of ps (linux). Similar output can be achieved with pstree (also linux) or ptree (Solaris). Show Sample Output


    5
    ps auxf
    systemj · 2009-02-05 18:07:16 0
  • Restart command if it dies.

    works well in crontab.


    5
    ps -C program_name || { program_name & }
    grokskookum · 2009-09-24 03:35:39 0
  • Top ten (or whatever) memory utilizing processes (with children aggregate)

    This command loops over all of the processes in a system and creates an associative array in awk with the process name as the key and the sum of the RSS as the value. The associative array has the effect of summing a parent process and all of it's children. It then prints the top ten processes sorted by size. Show Sample Output


    5
    ps axo rss,comm,pid | awk '{ proc_list[$2]++; proc_list[$2 "," 1] += $1; } END { for (proc in proc_list) { printf("%d\t%s\n", proc_list[proc "," 1],proc); }}' | sort -n | tail -n 10
    d34dh0r53 · 2010-03-03 16:41:05 2
  • Save your open windows to a file so they can be opened after you restart

    This will save your open windows to a file (~/.windows). To start those applications: cat ~/.windows | while read line; do $line &; done Should work on any EWMH/NetWM compatible X Window Manager. If you use DWM or another Window Manager not using EWMH or NetWM try this: xwininfo -root -children | grep '^ ' | grep -v children | grep -v '<unknown>' | sed -n 's/^ *\(0x[0-9a-f]*\) .*/\1/p' | uniq | while read line; do xprop -id $line _NET_WM_PID | sed -n 's/.* = \([0-9]*\)$/\1/p'; done | uniq -u | grep -v '^$' | while read line; do ps -o cmd= $line; done > ~/.windows Show Sample Output


    5
    wmctrl -l -p | while read line; do ps -o cmd= "$(echo "$line" | awk '$0=$3')"; done > ~/.windows
    matthewbauer · 2010-07-04 22:11:24 2
  • display date of last time a process was started in `date` format

    STARTED Mon Oct 18 04:02:01 2010 Show Sample Output


    5
    ps -o lstart <pid>
    nottings · 2010-10-18 17:09:02 0
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Fork Bomb for Windows
Quick and dirty forkbomb for all flavors of windows Do not use in production. Replace start with a command of your choice, this will just open a new command prompt and is pretty tricky to stop once started

Sort file greater than a specified size in human readeable format including their path and typed by color, running from current directory
1. find file greater than 10 MB 2. direct it to xargs 3. xargs pass them as argument to ls

Convert seconds to [DD:][HH:]MM:SS
Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

String to binary
Cool but useless.

Update zone file Serial numbers
Will edit *.db files in the same directory with todays date. Useful for doing a mass update to domains on a nameserver, adding spf records, etc. Looks for a string starting with 200 or 201 followed by 7 numbers, and replaces with todays date. This won't overwrite Ip's but i would still do some double checking after running this. Make sure your server's date is correct, otherwise insert your own serial number. $rndc reload should usually follow this command.

Grab just the title of a youtube video
There's another version on here that uses GET but some people don't have lwp-request, so here's an alternative. It's also a little shorter and should work with most youtube URLs since it truncates at the first &

a fast way to repeat output a byte
the speed is about 500MB/s on my machine. i think it's fast enough to output not too many bytes. while a C program may output 1GB per sencond on my machine. if the size is not the power of 512,you may change the bs and count in dd.

Play music from youtube without download

slow down CPU and IO for process and its offsprings.

convert filenames in current directory to lowercase
This will convert filenames from uppercase to lowercase. I find this useful after downloading images from my digital camera. This works for English, but other languages may need something slightly more complex like this: $ for i in *; do mv "$i" "$(echo $i|tr [:upper:] [:lower:])"; done Also, the quote marks aren't necessary if your filenames don't contain spaces.

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