Commands tagged HEAD (26)

  • Search Google from the command line and return the first result.

    Yep, now you can finally google from the command line! Here's a readable version "for your pleasure"(c): google() { # search the web using google from the commandline # syntax: google google query=$(echo "$*" | sed "s:%:%25:g;s:&:%26:g;s:+:%2b:g;s:;:%3b:g;s: :+:g") data=$(wget -qO - "https://ajax.googleapis.com/ajax/services/search/web?v=1.0&q=$query") title=$(echo "$data" | tr '}' '\n' | sed "s/.*,\"titleNoFormatting//;s/\":\"//;s/\",.*//;s/\\u0026/'/g;s/\\\//g;s/#39\;//g;s/'amp;/\&/g" | head -1) url="$(echo "$data" | tr '}' '\n' | sed 's/.*"url":"//;s/".*//' | head -1)" echo "${title}: ${url} | http://www.google.com/search?q=${query}" } Enjoy :) Show Sample Output


    -7
    The command is too big to fit here. :( Look at the description for the command, in readable form! :)
    hunterm · 2011-01-05 02:45:28 8
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Print the IPv4 address of a given interface

View non-printing characters with cat
Useful to detect number of tabs in an empty line, DOS newline (carriage return + newline). A tool that can help you understand why your parsing is not working.

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"

print java packages by using unix tree and sed
if you need a quick way of printing out all the packages that contain classes this command will print the directory structure and replace '/' with '.' It will also ignore CVS directories (we use CVS here)

Delete Last Line of a File if it is Blank
Use sed to remove the last line of a file only if it is empty.

Prepare B&W scans for clean looking, searchable PDF
Scan pages in, clean them up in an image editor, save to individual files. Use this command to convert each page to PDF. Combine in Acrobat Professional, and use the built-in OCR with the "Searchable Image (Exact)" option. Gives excellent image quality and file size (avoids awful JPEG image recompression that Acrobat and other OCR systems tend to do.)

Extract audio from a video
With the -vn switch we make our intentions clear and ask FFmpeg not to bother itself with the video. Next we specify the audio codec copy, which tells FFmpeg to use the same codec to encode the audio, which it uses to decode it. To keep things simple, we'll just keep the sampling and bitrate values the same.

Check if a machine is online
PING parameters c 1 limits to 1 pinging attempt q makes the command quiet (or silent mode) /dev/null 2>&1 is to remove the display && echo ONLINE is executed if previous command is successful (return value 0) || echo OFFLINE is executed otherwise (return value of 1 if unreachable or 2 if you're offline yourself). I personally use this command as an alias with a predefined machine name but there are at least 2 improvements that may be done. Asking for the machine name or IP Escaping the output so that it displays ONLINE in green and OFFLINE in red (for instance).

AWK: Set Field Separator from command line

df without line wrap on long FS name

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