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  • 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

    rpm -qa --queryformat '%{installtime} \"%{vendor}\" %{name}-%{version}-%{release} %{installtime:date}\n' | grep "Thu 05 Mar"
    mpb · 2009-03-17 13:38:20 1
  • "play" is part of "SoX" SoX - Sound eXchange, the Swiss Army knife of audio manipulation. For details, see: man sox Show Sample Output

    play $audio_file
    mpb · 2009-03-17 11:30:02 2
  • Create backup (.tar.gz) for all first-level directory from current dir. Show Sample Output

    find -maxdepth 1 -type d -print0 | xargs -0 -I {} tar -cvzf {}.tar.gz {}
    piemme · 2009-03-17 11:12:53 3
  • This command will tell lynx to read keystrokes from the specified file - which can be used in a cronjob to auto-login on websites that give you points for logging in once a day *cough cough* (which is why I used -accept_all_cookies). For creating your keystroke file, use: lynx -cmd_log yourfile

    lynx -accept_all_cookies -cmd_script=/your/keystroke-file
    Alanceil · 2009-03-17 00:38:36 0
  • 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-

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

    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

    # indicates a comment in shell
    mpb · 2009-03-16 23:15:33 0
  • Hold ctrl and press z to pause the current thread. Run fg to resume it.

    mallegonian · 2009-03-16 20:58:31 4
  • Add calendar to desktop wallpaper , mess with the coordinates to place where you like

    convert -font -misc-fixed-*-*-*-*-*-*-*-*-*-*-*-* -fill black -draw "text 270,260 \" `cal` \"" testpic.jpg newtestpic.jpg
    dasmna · 2009-03-16 16:09:58 3

  • 9
    alias lvim="vim -c \"normal '0\""
    lowkey · 2009-03-16 15:41:00 0
  • ./* is for copying files starting with - .[!.]* is for copying hidden files and avoiding copying files from the parent directory. ..?* is for copying files starting with .. (avoids the directory ..) /path/to/dir the path to the directory where the files should be copied Can also be used as a script. Input argument is /path/to/dir in tcsh, replace .[!.]* with .[^.]*

    cp ./* .[!.]* ..?* /path/to/dir
    ako · 2009-03-16 13:27:36 0
  • With: -vcodec, you choose what video codec the new file should be encoded with. Run ffmpeg -formats E to list all available video and audio encoders and file formats. copy, you choose the video encoder that just copies the file. -acodec, you choose what audio codec the new file should be encoded with. copy, you choose the audio encoder that just copies the file. -i originalfile, you provide the filename of the original file to ffmpeg -ss 00:01:30, you choose the starting time on the original file in this case 1 min and 30 seconds into the film -t 0:0:20, you choose the length of the new film newfile, you choose the name of the file created. Here is more information of how to use ffmpeg:

    ffmpeg -vcodec copy -acodec copy -i orginalfile -ss 00:01:30 -t 0:0:20 newfile
    ako · 2009-03-16 12:58:07 1
  • This command is a powerful "detoxifier" that eliminates special chars, spaces and all those little chars we don't like. It support several "sequences" so be sure to check your /usr/local/etc/detoxrc while at it... and maybe define your own Show Sample Output

    detox -r -s utf_8 /path/to/old/win/files/dir
    renich · 2009-03-16 07:50:36 3
  • Takes a input file (count.txt) that looks like: 1 2 3 4 5 It will add/sum the first column of numbers.

    cat count.txt | awk '{ sum+=$1} END {print sum}'
    duxklr · 2009-03-16 00:22:13 7
  • There is no need to 'zcat textfile.gz | less' with newer distros. This is useful for reading archived log files without having to extract, read, and zip when done.

    less textfile.gz
    allbad · 2009-03-15 23:51:17 8

  • 0
    openssl pkcs12 -export -in /dir/CERTIFICATE.pem -inkey /dir/KEY.pem -certfile /dir/CA-cert.pem -name "certName" -out /dir/certName.p12
    gadget00 · 2009-03-15 23:14:26 0
  • This will print out the files and directories in a gzipped tarball.

    less file.tar.gz
    allbad · 2009-03-15 23:00:05 5
  • Low on disk space? Check the largest installed RPMs for delete canditates. Show Sample Output

    rpm -qa --qf '%{SIZE} %{NAME}\n' | sort -nr | nl | head -6 # six largest RPMs
    mpb · 2009-03-15 22:18:17 0
  • This command converts filenames with embedded spaces in the current directory replacing spaces with the underscore ("_") character. Show Sample Output

    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 13

  • 0
    echo "encryptedpassword"|openssl passwd -1 -stdin
    chmouel · 2009-03-15 17:06:50 1
  • This command is a bit Linux specific, as --stdin doesn't exist for passwd on many Unix machines. Further, useradd is high level in most distributions and Unix derivatives except for the Debian family of distros, where adduser would be more appropriate. The last bit, with chage, will force the user to change their password on new login.

    for name in larry moe schemp; do useradd $name; echo 'password' | passwd --stdin $name; chage -d 0 $name; done
    atoponce · 2009-03-15 12:02:39 4
  • 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

    gcal -K -q GB_EN 2009 # display holidays in UK/England for 2009 (with week numbers)
    mpb · 2009-03-15 10:19:52 2

  • 3
    sort file1.txt | uniq > file2.txt
    rain · 2009-03-14 20:24:06 6
  • 'visudo' is installed by default on most Unix-like systems. If not installed, you can get it from the 'sudo' package. 'visudo' will use the text editor found in your $EDITOR variable, whether it's vi, vim, emacs, nano or gedit. After making changes to the /etc/sudoers file, visudo will check for syntax errors, and notify you of them. This is better than 'vi /etc/sudoers', because of this capability. Rule #1 of system administration- if there is a tool that exists for editing config files, use the tool.

    atoponce · 2009-03-14 03:39:32 0
  • Merge all pdf files in the directory into one pdf file (the out.pdf file)

    gs -q -sPAPERSIZE=letter -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=out.pdf `ls *.pdf`
    oops66 · 2009-03-13 22:34:14 4
  • Can pipe to tail or change the awk for for file size, groups, users, etc. Show Sample Output

    ls -l|awk '{print $6,$8}'|sort -d
    archlich · 2009-03-13 19:00:18 4
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