Commands by mpb (44)

  • Clear terminal Screen


    -4
    tput clear
    mpb · 2019-06-12 17:51:31 34
  • Print the 16 most recent RPM packages installed in newest to oldest order

    Display a list of the 16 most recently installed RPM packages with newest first. Show Sample Output


    0
    rpm -qa --queryformat '%{INSTALLTIME} %{name}-%{version}-%{release}\n' | sort -k 1,1 -rn | nl | head -16 | awk '{printf("%3d %s %s\n", $1,strftime("%c",$2),$3)}'
    mpb · 2018-09-12 17:47:26 329
  • function to compute what percentage of X is Y? Where percent/100 = X/Y => percent=100*X/Y

    This function make it easy to compute X/Y as a percentage. The name "wpoxiy" is an acronym of "what percentage of X is Y" Show Sample Output


    1
    function wpoxiy () { # What percentage of X is Y? Where percent/100 = X/Y => percent=100*X/Y # Example: wpoxiy 10 5 # 50.00% # Example: wpoxiy 30 10 # 33.33% echo $(bc <<< "scale=2; y=${1}; x=${2}; percent=x*100/y; percent")"%"; }
    mpb · 2018-06-10 22:43:20 239
  • Generate a Google maps URL for GPS location data from digital photo

    This command uses the "exiftool" command which is available here: http://www.sno.phy.queensu.ca/~phil/exiftool/ NB, there should be a degree symbol right after the first "%d" NOT a question mark. For some unknown reason, commandlinefu is not able to handle degree symbol correctly ("?")? Show Sample Output


    3
    echo "https://www.google.com/maps/place/$(exiftool -ee -p '$gpslatitude, $gpslongitude' -c "%d?%d'%.2f"\" image.jpg 2> /dev/null | sed -e "s/ //g")"
    mpb · 2016-06-09 13:33:10 12
  • Inverted cowsay

    It's quite fun to invert text using "flip.pl" (ref: http://ubuntuforums.org/showthread.php?t=2078323 ). Slightly more challenging is to flip a whole "cowsay". :-) Show Sample Output


    0
    echo Which way up? | flip.pl | cowsay | tac | sed -e "s,/,+,g" -e "s,\\\,/,g" -e "s,+,\\\,g" -e "s,_,-,g" -e "s,\^,v,g"
    mpb · 2016-04-08 11:41:44 28
  • display systemd log entries for sshd using "no-pager" (a bit like in pre-systemd: grep sshd /var/log/messages)

    In pre-systemd systems, something like: "# grep sshd /var/log/messages" would display log events in /var/log/messages containing "sshd". # journalctl -u sshd --no-pager The above command displays similar results for systemd systems. (Note that this needs to be run with root permissions to access the log data.)


    2
    # journalctl -u sshd --no-pager # display sshd log entries
    mpb · 2015-10-15 08:48:47 14
  • Display how much memory installed on system

    This will display the system memory size in kb. If you want to see the value in mb, you can type: grep MemTotal: /proc/meminfo | awk '{printf("MemTotal: %d MB\n",$2/1024)}' Show Sample Output


    0
    grep MemTotal: /proc/meminfo # display how much memory installed
    mpb · 2015-05-15 09:19:02 17
  • summarize a list of IP addresses, verifying IP address and giving counts for each IP found

    Working with lists of IP addresses it is sometimes useful to summarize a count of how many times an IP address appears in the file. This example, summarizeIP, uses another function "verifyIP" previously defined in commandlinefu.com to ensure only valid IP addresses get counted. The summary list is presented in count order starting with highest count. Show Sample Output


    1
    function summaryIP() { < $1 awk '{print $1}' | while read ip ; do verifyIP ${ip} && echo ${ip}; done | awk '{ip_array[$1]++} END { for (ip in ip_array) printf("%5d\t%s\n", ip_array[ip], ip)}' | sort -rn; }
    mpb · 2015-05-01 16:45:05 10
  • function to verify an IP address - can be used at the shell prompt or in a shell script

    When processing IP addresses in the shell (or shell script) it is useful to be able to verify that the value of data is an IP address (an not some random string or non-sensible IP address). Show Sample Output


    1
    function verifyIP() { octet="(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])"; ip4="^$octet\.$octet\.$octet\.$octet$"; [[ ${1} =~ $ip4 ]] && return 0 || return 1; }
    mpb · 2015-05-01 12:22:57 16
  • Convert a .ogv recording (eg from recordmydesktop in Gnome/Linux) into a .wmv (eg for playback in Windows)

    I needed to convert a screen capture when using Gnome's "recordmydesktop" and convert it to a .wmv for playback in Windows.


    0
    ffmpeg -i input.ogv -qscale 0 output.wmv # convert .ogv to .wmv
    mpb · 2014-06-24 16:23:18 7
  • Shutdown and restart Windoze from the command line

    Today, I needed to reboot a Windoze machine on another continent which had no shutdown or restart options via "Start" in the remote desktop (the only options available were: "Logoff, Disconnect, or Lock"). Fortunately, I found how to shutdown and restart from the command line.


    -1
    C:\> shutdown /f /r /t 0
    mpb · 2014-04-02 22:35:00 9
  • gh or "grep history" - define a function gh combining history and grep to save typing

    By defining a function "gh" as shown here, it saves me typing "history | grep" every time I need to search my shell history because now I only have to type "gh". A nifty time saver :-) You can also add the "gh" function definition to your .bashrc so it is defined each time you login. (updated 2015_01_29: changed from hg to gh to avoid clash with that other hg command. mnemonic: gh = grep history) Show Sample Output


    4
    function gh () { history | grep $* ; } # gh or "grep history"
    mpb · 2014-04-02 15:17:31 11
  • Welcome humans!

    Some information about robots. :-)


    6
    firefox about:robots
    mpb · 2013-07-07 14:12:36 6
  • Get a list of Mageia Linux mirrors providing rsync connectivity for Mageia 4 release

    Need to find a Mageia Linux mirror server providing Mageia 4 via rsync? Modify the "url=" string for the version you want. This shows i586 which is the 32bit version. If you want the 64bit version it is: url=http://mirrors.mageia.org/api/mageia.4.x86_64.list; wget -q ${url} -O - | grep rsync: Show Sample Output


    1
    url=http://mirrors.mageia.org/api/mageia.4.i586.list; wget -q ${url} -O - | grep rsync:
    mpb · 2013-05-20 16:19:05 7
  • Display 16 largest installed RPMs in size order, largest first

    Interesting to see which packages are larger than the kernel package. Useful to understand which RPMs might be candidates to remove if drive space is restricted. Show Sample Output


    1
    rpm -qa --queryformat '%{size} %{name}-%{version}-%{release}\n' | sort -k 1,1 -rn | nl | head -16
    mpb · 2013-03-19 21:10:54 6
  • ls -qahlSr # list all files in size order - largest last

    I find it useful, when cleaning up deleting unwanted files to make more space, to list in size order so I can delete the largest first. Note that using "q" shows files with non-printing characters in name. In this sample output (above), I found two copies of the same iso file both of which are immediate "delete candidates" for me. Show Sample Output


    1
    ls -qahlSr # list all files in size order - largest last
    mpb · 2013-03-13 09:52:07 29
  • ls -qaltr # list directory in chronological order, most recent files at end of list

    I find it very handy to be able to quickly see the most recently modified/created files in a directory. Note that the "q" option will reveal any files with non-printable characters in their filename. Show Sample Output


    7
    ls -qaltr # list directory in chronological order, most recent files at end of list
    mpb · 2013-02-25 14:14:44 13
  • Check if system is 32bit or 64bit

    Display the machine "hardware name" 32 or 64 bit. "x86_64" is shown on 64 bit machines "i686" is typically shown on 32 bit machines (although, you might also see "i386" or "i586" on older Linuxen). On other "unix-like" systems, other hardware names will be displayed. For example, on AIX, "uname -m" gives the "machine sequence number". For whatever reason, IBM decided that "uname -M" would give the machine type and model. (ref: http://www.ibm.com/developerworks/aix/library/au-aix-systemid.html ) On Sun Solaris, "uname -m" can be used to determine the chip type and "isainfo -v" will reveal if the kernel is 64 or 32 bit. (ref: http://www.ibiblio.org/pub/packages/solaris/sparc/html/32.and.64.bit.packages.html ) A more reliable way to determine "64-bit ness" across different Unix type systems is to compile the following simple C program: cat <<eeooff > bits.c /* * program bits.c * purpose Display "32" or "64" according to machine type * written January 2013 * reference http://www.unix.org/whitepapers/64bit.html */ /* hmm, curious that angle-brackets removed by commandlinefu.com data input processing? */ #include "/usr/include/stdio.h" long lv = 0xFFFFFFFF; main ( ) { printf("%2d\n",(lv < 0)?32:64); } eeooff Compile and run thusly: cc -o bits bits.c; ./bits Show Sample Output


    -4
    uname -m # display machine "hardware name"
    mpb · 2013-01-04 11:46:43 15
  • Display holidays in UK/England for December/2012 and January/2013 (with week numbers)

    Display the holidays in December and January for UK/England (2012/2013). Most Linux distros have "gcal" in their package manager system. If not, it is available here: http://www.gnu.org/software/gcal Show Sample Output


    0
    gcal -K -q GB_EN December/2012-January/2013 # Holidays for Dec/2012 and Jan/2013 with week numbers
    mpb · 2012-11-07 18:01:31 4
  • generate a random 10 character password

    Generate a table of random 10 character passwords Show Sample Output


    1
    pwgen 10 # generate a table of 10 character random passwords
    mpb · 2012-10-26 08:57:47 4
  • from within vi, sort a block of IP addresses (ascending, removing duplicates)

    The vi key sequence "!}" will feed the block of lines from the current position to the next blank line to the command provided: in this case "sort -nut. -k 1,1 -k 2,2 -k 3,3 -k 4,4". The sort is ascending, numeric (-n), removing duplicates (-u), using "." as key delimiter (-t ."). The "-nut." is a memorable mnemonic :-). The same command (less the "!}") can, of course, be used from command line to sort a file of IP addresses in a text file. In the command line version, I found it also useful to remove blank lines and comment lines thusly: < IPaddresses.txt sed -e "/^#/d" -e "/^$/d" | sort -nut. -k 1,1 -k 2,2 -k 3,3 -k 4,4 # sort IP addresses


    0
    !}sort -nut. -k 1,1 -k 2,2 -k 3,3 -k 4,4
    mpb · 2012-08-12 16:16:24 7
  • vi: search string "^~" (unlikley pattern). Useful after search/highlight when you want to drop the highlighting.

    When searching in vi, the search string gets highlighted but the highlighting can become a nuisance. By searching for the very unlikely pattern "^~" the highlighting is effectively switched off. Show Sample Output


    -5
    /^~
    mpb · 2012-08-02 21:10:23 10
  • Define shell variable HISTIGNORE so that comments (lines starting with #) appear in shell history

    I was surprised to find that with RedHat bash, I could not find any comment lines (begining with #) in my bash shell history. Surprised because in Mageia Linux this works. It turns out that RedHat's bash will keep comment lines if in my .bashrc, I define: export HISTIGNORE=' cd "`*: PROMPT_COMMAND=?*?' Why have comment lines in shell history? It's a handy and convenient way to make proto-commands (to be completed later) and for storing brief text data that is searchable in shell history. Show Sample Output


    1
    export HISTIGNORE=' cd "`*: PROMPT_COMMAND=?*?'
    mpb · 2011-10-18 19:58:39 870
  • display lines in /etc/passwd between line starting ...

    [continued]...with "bin:" and line starting with "lp:". This specific example with /etc/passwd shows the power of sed to extract data from text files. Here we see an extract from /etc/passwd beginning with the line starting with "bin:" and ending with the line starting with "lp:". Note also, placing the STDIN redirection at the start of the command makes it easy to recall and modify the command parameters line in shell history. Show Sample Output


    0
    < /etc/passwd sed -n "/^bin:/,/^lp:/p"
    mpb · 2011-10-18 13:33:12 6
  • Define Google Talk plugin urpmi media source for Mandriva/Mageia (works for both 32-bit and 64-bit systems)

    This command adds a urpmi media source called "google-talkplugin" to the urpmi configuration on Mandriva or Mageia. Needs to be run as root. We specify the option "--update" so that when Google provides a newer version of Google Talk plugin in their download system then running a system update (eg: "urpmi --auto-update") will result in our copy of Google Talk plugin getting updated (along with any other Mandriva/Mageia pending updates). To install Google Talk plugin from this source, use: urpmi google-talkplugin # install plugin used for voice and video Google chat via gmail Show Sample Output


    0
    urpmi.addmedia --update google-talkplugin http://dl.google.com/linux/talkplugin/rpm/stable/$(uname -m | sed -e "s/i.86/i386/")
    mpb · 2011-04-30 23:01:36 3
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Convert clipboard HTML content to markdown (for github, trello, etc)
I always wanted to be able to copy formatted HTML, like from emails, on trello cards or READMEs... but the formatting is always wrong... But from this two links: * https://jeremywsherman.com/blog/2012/02/08/pasting-html-into-markdown/ * http://stackoverflow.com/questions/3261379/getting-html-source-or-rich-text-from-the-x-clipboard For instance, to to copy an formatted email to a trello card, just: 1. Select the email body 2. run: xclip -selection clipboard -o -t text/html | pandoc -f html -t markdown_github - | xclip -i -t text/plain 3. Paste in your trello card 4. Profit! 8-)

Create a git alias that will pull and fast-forward the current branch if there are no conflicts
This command will first add an alias known only to git, which will allow you to pull a remote and first-forward the current branch. However, if the remote/branch and your branch have diverged, it will stop before actually trying to merge the two, so you can back out the changes. http://www.kernel.org/pub/software/scm/git/docs/git-pull.html Tested on git 1.5.6.1, msysgit (Windows port) Actually this is not really the way I want it. I want it to attempt a fast-foward, but not attempt to merge or change my working copy. Unfortunately git pull doesn't have that functionality (yet?).

Unbelievable Shell Colors, Shading, Backgrounds, Effects for Non-X
I've been using linux for almost a decade and only recently discovered that most terminals like putty, xterm, xfree86, vt100, etc., support hundreds of shades of colors, backgrounds and text/terminal effects. This simply prints out a ton of them, the output is pretty amazing. If you use non-x terminals all the time like I do, it can really be helpful to know how to tweak colors and terminal capabilities. Like: $ echo $'\33[H\33[2J'

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

list files recursively by size

rsync over ssh via non-default ssh port
tested on cygwin and Fedora 9 . good to remember for those jobs where you cannot set a site-specific connect option in your ~/.ssh/config file.

Show Shared Library Mappings
shows which shared lib files are pointed to by the dynamic linker.

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" }

Given process ID print its environment variables
Same as previous but compatible with BSD/IPSO

Detect illegal access to kernel space, potentially useful for Meltdown detection
Based on capsule8 agent examples, not rigorously tested

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