bash one liner to change/remove test pattern from config file or text file.

Problem:

I had a directory with a lot of config files in the ini file format, i.e. name and value separated by equals. Some/all of these contained some directory names and other values which had to be replaced. But there were other place where I should not not replace them, if there was no exact match. I also needed to have a backup copy of the file that I was modifying. Since the number of files that I needed to change was multiple so was quite difficult to do it without using some script.

Quick one liner bash function to navigate parent directories quickly

up () { for i in $(seq 1 $1) ; do cd  ..; pushd +1 ; done; }
— if you like the popd and pushd way ..

up () { for i in $(seq 1 $1) ; do cd  ..; done; }
— otherwise .. <div class="zemanta-pixie"><img class="zemanta-pixie-img" src="http://blog.amit-agarwal.co.in/wp-content/uploads/2010/08/pixy4.gif" />

find duplicate entry in a list in bash with sed

Here I will take an example of rss2email list, but I guess I will be able to pass on the concept.

Here is example of the output of the r2e list command:

1: http://blog.amit-agarwal.co.in/feed (default: amitag@localhost)
2: http://feeds2.feedburner.com/AllAboutLinux (default: amitag@localhost)
3: http://feeds2.feedburner.com/Command-line-fu (default: amitag@localhost)
4: http://blogs.members.freewebs.com/Members/Blogs/viewBlogRSS.jsp?userid=29731143 (default: amitag@localhost)

Target here is to get the list of all duplicate entries if any. So, first we need to remove the numbers from the begining and the email ID from the end.

remove/replace text/path in config file.

Lot of times I end up changing a particular text in config file to some other text. And when I have to do it for multiple files, all files having the text in multiple places, I end up opening the files in vim and then doing a globlal replace. But this is not efficient so I cam up with some one liners to do this for me. For removing any occurance of text in all files in the directory :

bash script to change the vim colorscheme from the list of locally available schemes

Today I was just wondering how good it would be to have a script to change the <a class="zem_slink freebase/en/vim" title="Vim (text editor)" rel="homepage" href="http://www.vim.org/">vim colorscheme from the <a class="zem_slink freebase/en/cmd_exe" title="Command Prompt" rel="wikipedia" href="http://en.wikipedia.org/wiki/Command_Prompt">command prompt. The plan for the script was simply to print the list of available schemes and then let the user select the actions from there on. So, here is the result: