Commands by mpb (45)

  • 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 4
  • reset Mageia urpmi media sources to network only

    On Mageia (and Mandriva) Linux, this command will clear your existing urpmi configuration and configure it to use only network sources. It can be useful after you have installed from CD/DVD and don't want to continually be prompted to insert CD/DVD each time you install a package. acknowledgement: blino


    2
    urpmi.removemedia -a && urpmi.addmedia --distrib --mirrorlist
    mpb · 2011-03-27 15:29:42 8
  • find the rpm package name that provides a specific file

    For Linux distributions using rpm (eg Mandriva), this command will find the rpm package name that provides a file. Show Sample Output


    2
    rpm -q --whatprovides $filename
    mpb · 2011-02-09 23:28:15 3
  • sort a list of comma separated numbers: sort_csn

    "sort_csn" is a function to sort a comma separated list of numbers. Define the the function with this: sort_csn () { echo "${1}" | sed -e "s/,/\n/g"| sort -nu | awk '{printf("%s,",$0)} END {printf("\n")}' | sed -e "s/,$//"; } Use the function like this: sort_csn 443,22,80,8200,1533,21,1723,1352,25 21,22,25,80,443,1352,1533,1723,8200 One example where this is useful is when port scanning with nmap and getting a list of open ports in random order. If you use Nessus, you may need to create a scan policy for that set of specific ports and it is clearer to read with the port numbers in ascending order (left to right). Caveat: no spaces in the comma separated list (just number1,number2,number3,etc). A variation of this to sort a comma separated list of strings: sort_css () { echo "${1}" | sed -e "s/,/\n/g"| sort -u | awk '{printf("%s,",$0)} END {printf("\n")}' | sed -e "s/,$//"; } usage: sort_css apples,pears,grapes,melons,oranges apples,grapes,melons,oranges,pears Show Sample Output


    0
    sort_csn () { echo "${1}" | sed -e "s/,/\n/g"| sort -nu | awk '{printf("%s,",$0)} END {printf("\n")}' | sed -e "s/,$//"; }
    mpb · 2011-01-26 15:18:08 6
  • securely erase unused blocks in a partition

    This command securely erases all the unused blocks on a partition. The unused blocks are the "free space" on the partition. Some of these blocks will contain data from previously deleted files. You might want to use this if you are given access to an old computer and you do not know its provenance. The command could be used while booted from a LiveCD to clear freespace space on old HD. On modern Linux LiveCDs, the "ntfs-3g" system provides ReadWrite access to NTFS partitions thus enabling this method to also be used on Wind'ohs drives. NB depending on the size of the partition, this command could take a while to complete. Show Sample Output


    8
    # cd $partition; dd if=/dev/zero of=ShredUnusedBlocks bs=512M; shred -vzu ShredUnusedBlocks
    mpb · 2009-06-21 14:17:22 13
  • securely overwrite a file with random junk, rename it to clear the directory entry and finally delete it

    Show Sample Output


    0
    shred -vzu /tmp/junk-file-to-be-shredded
    mpb · 2009-06-18 12:00:19 12
  • Using bash inline

    There are two ways to use "here documents" with bash to fill stdin: The following example shows use with the "bc" command. a) Using a delimiter at the end of data: less-than less-than eeooff bc > k=1024 > m=k*k > g=k*m > g > eeooff 1073741824 b) using the "inline" verion with three less-than symbols: less-than less-than less-than "k=1024; m=k*k; g=k*m; g" bc 1073741824 One nice advantage of using the triple less-than version is that the command can easily be recalled from command line history and re-executed. PS: in this "description", I had to use the name "less-than" to represent the less-than symbol because the commandlinefu input text box seems to eat up the real less-than symbols. Odd. Show Sample Output


    9
    <<<"k=1024; m=k*k; g=k*m; g" bc
    mpb · 2009-06-17 10:35:10 13
  • Apply all pending updates to Mandriva Linux system (2008.0 and newer).

    Update a Mandriva Linux system with any pending updates. This command needs to be run with root privilege. Using the "--force" option answers "yes" to any interactive prompts thus allowing the updates to be left unattended to completion. NB if there is an update for glibc and/or a new kernel then the system would need to be rebooted for these to take effect. A prerequisite for running "urpmi --auto-update" is to have correctly defined urpmi media sources (which can be done by visiting http://easyurpmi.zarb.org/). If there are no new updates the the message "Packages are up to date" is shown. Show Sample Output


    0
    urpmi --auto-update --force # apply all pending updates (Mandriva Linux)
    mpb · 2009-03-28 14:59:26 8
  • Generate random passwords (from which you may select "memorable" ones)

    See: "man pwgen" for full details. Some Linux distros may not have pwgen included in the base distribution so you maye have to install it (eg in Mandriva Linux: "urpmi pwgen"). Show Sample Output


    6
    pwgen
    mpb · 2009-03-28 11:43:21 8
  • from within vi, pipe a chunk of lines to a command line and replace the chunk with the result

    The vi key sequence !}command will send the file contents from the cursor to the next blank line as STDOUT to the command specified and replace that sequence of file lines with the output of the command. For example: sorting a block of data - !}sort The sequence !{command will do the same but "upwards" (from the current position towards the start of the file. Show Sample Output


    12
    !}sort
    mpb · 2009-03-28 00:18:39 13
  • find an unused unprivileged TCP port

    Some commands (such as netcat) have a port option but how can you know which ports are unused? Show Sample Output


    4
    netstat -atn | awk ' /tcp/ {printf("%s\n",substr($4,index($4,":")+1,length($4) )) }' | sed -e "s/://g" | sort -rnu | awk '{array [$1] = $1} END {i=32768; again=1; while (again == 1) {if (array[i] == i) {i=i+1} else {print i; again=0}}}'
    mpb · 2009-03-27 20:38:43 11
  • How many world writeable files on your system? (Mandriva Linux msec)

    Mandriva Linux includes a security tool called "msec" (configurable via "draksec"). One of the many things it regularily checks for is world writeable files. If any are found, it writes the list to /var/log/security/writable.today. "wc -l" simply counts the number of lines in the file. This number should be low. Browse through /var/log/security/writable.today and consider if any of those files *need* to be world-writeable (and if not, modify the permissions. eg: "chmod o-w $file"). A large number of world-writeable files may indicate that umask is not correctly set in /etc/profile (or ${HOME}/.bash_profile) but could also indicate poor security configuration or even malicious activity. Show Sample Output


    0
    # wc -l /var/log/security/writable.today
    mpb · 2009-03-19 12:25:52 12
  • Display list of locked AFS volumes (if any)

    This command shows if there are any locked AFS volumes. The output is a list of AFS volume IDs (or nothing if there are none locked). Show Sample Output


    0
    vos listvldb | agrep LOCKED -d RWrite | grep RWrite: | awk -F: '{print $2}' | awk '{printf("%s ",$1)} END {printf("\n")}'
    mpb · 2009-03-17 19:55:39 12
  • Display a list of RPMs installed on a particular date

    Find out which RPMs were installed on a particular date. These would (naturally) include update RPMs. This example shows searching for "Thu 05 Mar" (with grep). Alternatively, pipe it to less so you can search inside less (with less's neat text highlighting of the search term): rpm -qa --queryformat '%{installtime} \"%{vendor}\" %{name}-%{version}-%{release} %{installtime:date}\n' | less # (this example) search term: Thu 05 Mar Show Sample Output


    4
    rpm -qa --queryformat '%{installtime} \"%{vendor}\" %{name}-%{version}-%{release} %{installtime:date}\n' | grep "Thu 05 Mar"
    mpb · 2009-03-17 13:38:20 15
  • Play audio file

    "play" is part of "SoX" SoX - Sound eXchange, the Swiss Army knife of audio manipulation. For details, see: man sox Show Sample Output


    -3
    play $audio_file
    mpb · 2009-03-17 11:30:02 15
  • Create a backup of file being edited while using vi

    At the start of a vi session and *before* saving any changes use ":!cp % %-" to make a backup of the current file being edited. example: vi /data/some/long/path/file :!cp% %- creates /data/some/long/path/file-


    5
    :!cp % %-
    mpb · 2009-03-17 00:34:24 19
  • #

    Using the "#" in shell is surprisingly useful. Some of the uses I found: a) As a visible copy buffer in shell history (caveat: do not use for passwords :-) b) To build complex commands until ready then hit the HOME, DEL, ENTER keys to run it c) Placing reference data into shell history (search for tags with CTRL-R TAGNAME) d) Putting aside a "work in progress" command to focus on another task (HOME # ENTER) Show Sample Output


    -4
    # indicates a comment in shell
    mpb · 2009-03-16 23:15:33 11
  • Display 6 largest installed RPMs sorted by size (descending)

    Low on disk space? Check the largest installed RPMs for delete canditates. Show Sample Output


    2
    rpm -qa --qf '%{SIZE} %{NAME}\n' | sort -nr | nl | head -6 # six largest RPMs
    mpb · 2009-03-15 22:18:17 15
  • Convert embedded spaces in filenames to "_" (underscore)

    This command converts filenames with embedded spaces in the current directory replacing spaces with the underscore ("_") character. Show Sample Output


    2
    ls -1 | grep " " | awk '{printf("mv \"%s\" ",$0); gsub(/ /,"_",$0); printf("%s\n",$0)}' | sh # rename filenames: spaces to "_"
    mpb · 2009-03-15 18:42:43 24
  • Display calendar with specific national holidays and week numbers

    NB when you run this gcal command in your shell, holidays are highlighted but this highlighting does not show in the sample output (above). To find full details on gcal options: gcal --long-help | less Example for United States, Pennsylvania: gcal -K -q US_PA 2009 # display holidays in USA/Pennsylvania for 2009 (with week numbers) Example for Hong Kong: gcal -K -q HK 2009 # display holidays in Hong Kong for 2009 (with week numbers) Show Sample Output


    5
    gcal -K -q GB_EN 2009 # display holidays in UK/England for 2009 (with week numbers)
    mpb · 2009-03-15 10:19:52 12
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Get MD5 checksum from a pipe stream and do not alter it

List files older than one year, exluding those in the .snapshot directory
Useful when you want to cron a daily deletion task in order to keep files not older than one year. The command excludes .snapshot directory to prevent backup deletion. One can append -delete to this command to delete the files : $ find /path/to/directory -not \( -name .snapshot -prune \) -type f -mtime +365 -delete

List the size (in human readable form) of all sub folders from the current location
Sorted in human readable format.

For finding out if something is listening on a port and if so what the daemon is.
See what's listening on your IPv4 ports on FreeBSD.

SVN Status log to CSV
Note you have also the --xml option ;)

Clear all Windows Event Log entries (cygwin)
Efficiently clear all Windows Event log entries from within a Cygwin terminal. Uses "cygstart" to launch a hidden "PowerShell" session passing a Powershell command to loop through and clear all Windows Event Log entries. Very useful for troubleshooting and debugging. The command should in theory elevate you session if needed. One liner is based on the PowerShell command: $ wevtutil el | foreach { wevtutil cl $_ }

Mortality Countdown
watch the seconds of your life tick away - replace YYYY-mm-dd HH:MM:ss w/ your birthtime.

Copy uncommitted changes from remote git repository
Copy changed files from remote git repository, _including binary ones_, staged and unstaged alike. Note that this command doesn't handle deleted files properly.

cd into another dir to run a one-liner, but implicitly drop back to your $OLD_PWD after
Obviously the example given is necessarily simple, but this command not only saves time on the command line (saves you using "cd -" or, worse, having to type a fully qualified path if your command cd's more than once), but is vital in scripts, where I've found the behaviour of "cd -" to be a little broken at times.

Recursively scan directories for mp3s and pass them to mplayer
The command first deletes any old playlist calles playlist.tmp under /tmp. After that it recursively searches all direcotries under ~/mp3 and stores the result in /tmp/playlist.tmp. After havin created the playlist, the command will execute mplayer which will shuffle through the playlist. This command is aliased to m is aliased to `rm -rf /tmp/playlist.tmp && find ~/mp3 -name *.mp3 > /tmp/playlist.tmp && mplayer -playlist /tmp/playlist.tmp -shuffle -loop 0 | grep Playing' in my ~/.bashrc.

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