sed tutorial and help

A very nice turorial and help <a href="http://sed.sourceforge.net/grabbag/tutorials/">here.

change the terminal title dynamically in X11

I was actually looking for this for quite sometime. Some years back in my bashrc was the proper setting for setting the terminal title when I did a cd, and I had completely forgotten how to do it. So today I searched quite a few commands the environment variables for doing the same and found it again.

Here it is (Just put this in your bashrc or bash_profile):

export PROMPT_COMMAND=&#8217;echo -ne &#8221;\033]0;`pwd`&#8221;; echo -ne &#8221;\007&#8221;&#8217;

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shell — one liner to selectively change case

Today I had a hard time, I had a herculian task of converting the case of file to upper case. Well that&#8217;s not difficult :), I know. What made it difficult was the fact that not the whole file had to be converted but only selective lines containing the work important. Okay now that too is not so difficult, I thought. But again the file size was huge, it had some 9 million lines. So, I just thought of trying my skills of shell programming (dont have much of it anyway). So here&#8217;s what I did:

Know when you will type :q in your term instead of vi(m), the alias will chewed you out.

most simple solution is to alias :q like so:
alias :q=`echo &#8221;This is not vim&#8221;`

but as someone suggested in commandlinefu, you can use tput to put some color and fun into this.
alias :q=&#8217;tput setaf 1; echo >&2 &#8221;this is NOT vi(m) :/&#8221;; tput sgr0&#8217;

Display a block of text with delineated by a start pattern and an end pattern

Taken idea from commandlinefu.com

The command will display a segment from the file from the start pattern to the end pattern.

function viewsegment() { tail -n +`fgrep -n -m 1 “$1” $3 | head -`fgrep -n -m 1 “$2” $3 }
Display a block of text with delineated by a start pattern and an end pattern

View the newest xkcd comic.

This function displays the latest comic from xkcd.com. One of the best things about xkcd is the title text when you hover over the comic, so this function also displays that after you close the comic.

$ xkcd(){ local f=$(curl -s <a href="http://xkcd.com/">http://xkcd.com/);display $(echo "$f"|grep -Po '(?<=")http://imgs.xkcd.com/comics/[^"]+(png|jpg)');echo "$f"|awk '/<img src="http://imgs.xkcd.com/comics/.?" title=./{gsub(/^.title=.|".?$/,"");print}';}

To get a random xkcd comic, I also use the following:

xkcdrandom(){ local f=$(wget -q <a href="http://dynamic.xkcd.com/comic/random/">http://dynamic.xkcd.com/comic/random/ -O -);display $(echo "$f"|grep -Po '(?<=")http://imgs.xkcd.com/comics/[^"]+(png|jpg)');echo "$f"|awk '/<img src="http://imgs.xkcd.com/comics/.?" title=./{gsub(/^.title=.|".?$/,"");print}';}

Insert a comment on command line for reminder

<a href="http://blog.amit-agarwal.co.in/category/linux/">Bookmark this category
Insert a comment on command line for reminder

$ ls -alh #mycomment

Comments can be used directly on the command line so I can save in the history a brief description of what command does.

* View this command to comment, vote or add to favourites * View all commands by vgagliardi

commandlinefu.com

by David Winterbottom (codeinthehole.com)

URL: <a href="http://feedproxy.google.com/~r/Command-line-fu/~3/_5hXsFUuAwc/insert-a-comment-on-command-line-for-reminder">http://feedproxy.google.com/~r/Command-line-fu/~3/_5hXsFUuAwc/insert-a-comment-on-command-line-for-reminder