Commands using whatis (8)

  • Do some learning...

    no loop, only one call of grep, scrollable ("less is more", more or less...)


    12
    ls /usr/bin | xargs whatis | grep -v nothing | less
    michelsberg · 2010-01-26 12:59:47 28
  • Do some learning...

    compgen -c finds everything in your path. Show Sample Output


    8
    whatis $(compgen -c) 2>/dev/null | less
    bashrc · 2013-02-01 00:03:33 2
  • Do some learning...


    7
    for i in $(ls /usr/bin); do whatis $i | grep -v nothing; done | more
    Abiden · 2010-01-26 06:15:54 4
  • Show a Command's Short Description

    The whatis command displays a short description for the command you list on the command line. It is useful to quickly learn what a command does Show Sample Output


    5
    whatis [command-name]
    haivu · 2009-04-02 17:30:13 7
  • for newbies, how to get one line info about all /bin programs

    Get simple description on each file from /bin dir, in list form, usefull for newbies. Show Sample Output


    4
    ls -1 /bin | xargs -l1 whatis 2>/dev/null | grep -v "nothing appropriate"
    stinger · 2009-02-17 14:46:01 5
  • Do some learning...

    Just realized how needless the 'ls' has been... This version is also multilingual, since there is no need to grep for a special key word ("nothing"/"nichts"/"rien"/"nada"...). And it makes use of all the available horizontal space. Show Sample Output


    3
    whatis /usr/bin/* 2> /dev/null | less
    michelsberg · 2013-01-31 22:25:30 5
  • Do some learning...

    I like it sorted... 2> /dev/null was also needless, since our pipes already select stdin, only.


    2
    whatis $(compgen -c) | sort | less
    michelsberg · 2013-02-01 09:13:56 2
  • Listing package man page, services, config files and related rpm of a file, in one alias

    Many times I give the same commands in loop to find informations about a file. I use this as an alias to summarize that informations in a single command. Now with variables! :D Show Sample Output


    2
    fileinfo() { RPMQF=$(rpm -qf $1); RPMQL=$(rpm -ql $RPMQF);echo "man page:";whatis $(basename $1); echo "Services:"; echo -e "$RPMQL\n"|grep -P "\.service";echo "Config files:";rpm -qc $RPMQF;echo "Provided by:" $RPMQF; }
    nnsense · 2015-05-11 16:46:01 9

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

find unreadable file

Write comments to your history.
A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

list files recursively by size

check open ports without netstat or lsof

Diff two directories by finding and comparing the md5 checksums of their contents.
Compute the md5 checksums for the contents of two mirrored directories, then sort and diff the results. If everything matches, nothing is returned. Otherwise, any checksums which do not match, or which exist in one tree but not the other, are returned. As you might imagine, the output is useful only if no errors are found, because only the checksums, not filenames, are returned. I hope to address this, or that someone else will!

Create a single-use TCP proxy with copy to stdout
USAGE: gate listening_port host port Creates listening socket and connects to remote device at host:port. It uses pipes for connection between two sockets. Traffic which goes through pipes is wrote to stdout. I use it for debug network scripts.

List alive hosts in specific subnet
Works on any machine with nmap installed. Previous version does not work on machines without "seq". Also works on subnets of any size.

Compose 2 images to 1
Compose 2 images (foreground.jpg with background.jpg) into 1 (image.jpg), the numeric parameters stablish the size of the foreground.jpg image (96x96) and the position x,y (+250+70) relative to the background.jpg image. Images can be any format, jpg, png, bmp, etc...

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.

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