All commands (14,001)

  • Show top 50 running processes ordered by highest memory/cpu usage refreshing every 1s

    http://alvinalexander.com/linux/unix-linux-process-memory-sort-ps-command-cpu for an overview of --sort available values


    4
    watch -n1 "ps aux --sort=-%mem,-%cpu | head -n 50"
    jgleeson · 2019-12-03 20:51:03 1
  • grep for minus (-) sign

    Use flag "--" to stop switch parsing Show Sample Output


    1
    grep -- -
    knoppix5 · 2019-11-29 23:45:06 0
  • Print all git repos from a user


    13
    curl -s https://api.github.com/users/<username>/repos?per_page=1000 |grep git_url |awk '{print $2}'| sed 's/"\(.*\)",/\1/'
    wuziduzi · 2019-11-19 20:31:19 1
  • create a nicely formatted example of a shell command and its output

    Shell function which takes a bash command as its input, and displays the following formatted output: EXAMPLE: command OUTPUT: output from command Show Sample Output


    8
    example() { echo "EXAMPLE:"; echo; echo " $@"; echo; echo "OUTPUT:"; echo ; eval "$@" | sed 's/^/ /'; }
    bartonski · 2019-11-10 19:08:23 1
  • Host cpu performance

    Measure the cpu performance: In-case if the cpu is thermal throttling then you can find it using this command. Check the first line of the output. Example: Doing md5 for 3s on 16 size blocks: 11406892 md5's in 2.98s ? #(When cpu is not throttling) Doing md5 for 3s on 16 size blocks: 110692 md5's in 2.98s ?? #(When cpu is thermal throttling) Practical use case: Once we had cooling outage in data center which caused thermal throttling in some of the worker nodes. We used this tool to prove that some servers are not performing well because of the cpu thermal throttling. Show Sample Output


    10
    openssl speed md5
    kharthigeyan · 2019-11-07 16:30:30 4
  • Make window transparent (50% opacity) in Gnome shell

    Click window to change its opacity. Source: https://unix.stackexchange.com/a/494289


    1
    xprop -format _NET_WM_WINDOW_OPACITY 32c -set _NET_WM_WINDOW_OPACITY 0x7FFFFFFF
    yoyoyojomo · 2019-10-31 20:44:21 0
  • Set RGB gamma of secondary monitor

    This command first determines whether a second screen is connected. If this is the case, it sets the screen's RGB gamma via xrandr. Useful for cheap or slightly defective monitors with a tint. In this example a yellowing/champagne color deviation is compensated for by decreasing the red and the green portion of the image.


    1
    secondscreen=$(xrandr -q | grep " connected" | sed -n '2 p' | cut -f 1 -d ' '); [ "$secondscreen" ] && xrandr --output $secondscreen --gamma 0.6:0.75:1
    lordtoran · 2019-10-28 13:12:08 0
  • Massive change of file extension (bash)

    Change the file extension in batch. Useful to create output file names with same input name but distinct extension by including logic inside the loop


    3
    for file in *.txt; do mv "$file" "${file%.txt}.xml"; done
    neomefistox · 2019-10-24 04:35:10 0
  • Find dupe files by checking md5sum


    5
    find /glftpd/site/archive -type f|grep '([0-9]\{1,9\})\.[^.]\+$'|parallel -n1 -j200% md5sum ::: |awk 'x[$1]++ { print $2 " :::"}'|sed 's/^/Dupe: /g'|sed 's,Dupe,\x1B[31m&\x1B[0m,'
    wuziduzi · 2019-10-22 16:02:15 1
  • Countdown Clock

    I find the other timers are inaccurate. It takes some microseconds to perform the date function. Therefore, using date/time math to calculate the time for us results in millisecond accuracy. This is tailored to the BusyBox date function. May need to change things around for GNU date function. Show Sample Output


    -1
    let T=$(date +%s)+3*60;while [ $(date +%s) -le $T ]; do let i=$T-$(date +%s); echo -ne "\r$(date -d"0:0:$i" +%H:%M:%S)"; sleep 0.3; done
    davidk · 2019-10-22 15:04:21 1
  • Top 10 Memory Processes (reduced output to applications and %usage only)

    Top 10 Memory Processes (reduced output to applications and %usage only) Show Sample Output


    2
    ps aux | sort -rk 4,4 | head -n 10 | awk '{print $4,$11}'
    n0a110w · 2019-10-20 22:52:55 0
  • Console clock

    You will see it on the corner of your running terminal. Show Sample Output


    5
    while sleep 1; do tput sc; tput cup 0 $(($(tput cols)-29)); date; tput rc; done &
    rakibfiha · 2019-10-19 20:50:48 1
  • Hide or show Desktop Icons on MacOS

    Hides all Files and Folders on the MacOS Desktop. To show files and folders, type "true" instead of "false". "Finder" at the end is case sensitive, "finder" doesn’t work


    1
    defaults write com.apple.finder CreateDesktop -bool false;killall Finder
    vranx · 2019-10-18 12:13:56 3
  • Rename all files in a directory to the md5 hash


    2
    for i in *; do sum=$(md5sum $i); mv -- "$i" "${sum%% *}"; done
    malsploit · 2019-10-17 08:46:22 2
  • Create file text with ISO Date name. (MAC OS CATALINA / BASH)

    Created, tested on MAC OS CATALINA Darwin Kernel Version 19.0.0: Thu Oct 17 16:17:15 PDT 2019; root:xnu-6153.41.3~29/RELEASE_X86_64 x86_64 bash. Show Sample Output


    -1
    touch `date +%Y-%m-%dT%H:%M:%S%z`.txt
    ThinWarrior · 2019-10-13 14:43:22 1
  • Print the DATE in ISO format.(MAC OS CATALINA / BASH)

    Print date in iso format. Created and tested on MAC OS CATALINA. Darwin Kernel Version 19.0.0: Thu Oct 17 16:17:15 PDT 2019; root:xnu-6153.41.3~29/RELEASE_X86_64 x86_64 bash Show Sample Output


    0
    date +%Y-%m-%dT%H:%M:%S%z
    ThinWarrior · 2019-10-13 13:49:58 5
  • Print github url for the current url

    Works for repos cloned via ssh or https. Show Sample Output


    1
    git remote -v | sed -n '/github.com.*push/{s/^[^[:space:]]\+[[:space:]]\+//;s|git@github.com:|https://github.com/|;s/\.git.*//;p}'
    bartonski · 2019-10-11 16:50:22 0
  • List the binaries installed by a Debian package

    GNU grep's perl-compatible regular expression(PCRE).


    1
    binaries () { dpkg -L "$1" | grep -Po '.*/bin/\K.*'; }
    metropolis · 2019-10-05 10:52:15 0
  • List the binaries installed by a Debian package

    This shell function displays a list of binaries contained in an installed package; works on Debian based Linux distributions. Show Sample Output


    1
    binaries () { for f in $(dpkg -L "$1" | grep "/bin/"); do basename "$f"; done; }
    lordtoran · 2019-10-05 10:37:51 3
  • Convert tab separate file (TSV) to JSON with jq

    With this command you can convert a tab separate file (TSV) into a JSON file with jq. For example, this input.tsv i-0b9adca882e5e6326 172.16.0.188 i-088dd69e5c3624888 172.16.0.102 i-0e70eac180537d4aa 172.16.0.85 will produce the showed output. Show Sample Output


    2
    cat input.tsv | jq --raw-input --slurp 'split("\n") | map(split("\t")) | .[0:-1] | map( { "id": .[0], "ip": .[1] } )'
    nordri · 2019-10-01 10:52:35 0
  • Top 10 Memory Processes

    It displays the top 10 processes sorted by memory usage Show Sample Output


    3
    ps aux | sort -rk 4,4 | head -n 10
    x3mboy · 2019-09-26 16:37:33 2
  • edit, view or execute last modified file with a single key-press

    Copy this function to command line, press 'Enter' 'f'' 'Enter' to execute (sentence on the left written only for newbies). Hint 'e|x|v|1..9' in front of displayed last modified file name means: "Press 'e' for edit,'x' for execute,'v' for view or a digit-key '1..9' to touch one file from the recent files list to be last modified" and suggested (hidden files are listed too, else remove 'a' from 'ls -tarp' statement if not intended). If you find this function useful you can then rename it if needed and append or include into your ~/.bashrc config script. With the command . ~/.bashrc the function then can be made immediately available. In the body of the function modifications can be made, i.e. replaced joe editor command or added new option into case statement, for example 'o) exo-open $h;;' command for opening file with default application - or something else (here could not be added since the function would exceed 255 chars). To cancel execution of function started is no need to press Ctrl-C - if the mind changed and want to leave simple Enter-press is enough. Once defined, this function can with typeset -f f command be displayed in easy readable form Show Sample Output


    2
    f() { ls -lart;e="ls -tarp|grep -v /|tail -9";j=${e/9/1};g=${e/9/9|nl -nln};h=$(eval $j);eval $g;read -p "e|x|v|1..9 $(eval $j)?" -n 1 -r;case $REPLY in e) joe $h;;v)cat $h;;x) eval $h;;[1-9]) s=$(eval $g|egrep ^$REPLY) && touch "${s:7}" && f;;esac ; }
    knoppix5 · 2019-09-26 11:58:37 0
  • Graphical tree of sub-directories with files

    The command finds every item within the directory and edits the output so that subdirectories are and files are output much like the tree command Show Sample Output


    1
    find . -print | sed -e 's;[^/]*/;|-- ;g;s;-- |; |;g'
    jonavon · 2019-09-25 17:49:35 0
  • restart Bluetooth from terminal


    -2
    $ sudo systemctl restart bluetooth
    jadnb · 2019-09-23 19:18:56 0
  • Hiding ur evil intent! Shame on you!

    as a shell script, the possibilities are endless... #!/bin/bash echo doing something very evil! exit echo doing something very nice! Show Sample Output


    -1
    echo 'doing something very evil' >/dev/null && echo doing something very nice!
    LyscmdFUer · 2019-09-20 12:47:19 1
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diff the outputs of two programs
I've been looking for this for a long time. Does anybody know how to do this in dash (POSIX shell)? An alternative version might be: $ exiftool img_1.jpg | diff -

Calculate your total world compile time. (Gentoo Distros)
From Gentoo Forum, greetings to rudregues & steveL.

Get AWS temporary credentials ready to export based on a MFA virtual appliance
You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

View a colorful logfile using less

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

grep certain file types recursively
doesn't do case-insensitive filenames like iname but otherwise likely to be faster

Parse YouTube url (get youtube video id)
url can be like any one of followings: $url="MejbOFk7H6c" $url="http://youtu.be/MejbOFk7H6c" $url="https://youtube.com/watch?feature=player_embedded&v=MejbOFk7H6c#t" $url="//www.youtube.com/v/MejbOFk7H6c?hl=ru_RU&version=3&rel=0" $url="http://www.youtube.com/embed/MejbOFk7H6c?feature=player_embedded" If url mismatching, whole url will be returned.

count how many times a string appears in a (source code) tree
grep -o puts each occurrence in a separate line

Replace Solaris vmstat numbers with human readable format
% cat ph-vmstat.awk # Return human readable numbers function hrnum(a) { b = a ; if (a > 1000000) { b = sprintf("%2.2fM", a/1000000) ; } else if (a > 1000) { b = sprintf("%2.2fK", a/1000) ; } return(b) ; } # Return human readable storage function hrstorage(a) { b = a ; if (a > 1024000) { b = sprintf("%2.2fG", a/1024/1024) ; } else if (a > 1024) { b = sprintf("%2.2fM", a/1024) ; } return(b) ; } OFS=" " ; $1 !~ /[0-9].*/ {print} $1 ~ /[0-9].*/ { $4 = hrstorage($4) ; $5 = hrstorage($5) ; $9 = hrnum($9) ; $10 = hrnum($10) ; $17 = hrnum($17) ; $18 = hrnum($18) ; $19 = hrnum($19) ; print ; }

Query wikipedia over DNS

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