May 16, 2012

push & pop - cd made bit easier

During my initial days as developer, I found myself doing cd to folders which were deep in the directory structures often having long names. Long names were not a big problem due to auto completion but remembering different directory names were a problem. The idea of having aliases for cd for different directories was dropped even before writing a single alias as I didn't want to remember the aliases for different directories. So I wrote two scripts named and The working is pretty simple, you go to a directory which need to be remembered, execute push. The pop script will give a list of remembered directories and based on the choice will take you to the selected directory. I hope you may find this useful. Here are the scripts:

[prime@ford bin]$ cat 
#! /bin/bash
tail -"$lines_to_keep" $data_file > $tmp_file
mv $tmp_file $data_file
echo $cur_dir >> $data_file

[prime@ford bin]$ cat 
#! /bin/bash
tail -"$lines_to_keep" $data_file |nl
echo -e "Choice please : " \\c
read choice
case "$choice" in
        echo "Invalid choice"
        return 0
dest_dir=`tail -"$lines_to_keep" $data_file | head -$choice |tail -1`
cd $dest_dir

Save scripts in a convenient location say ~/bin. The script need to run in the current shell the cd to work correctly. This can be either be done by preceding the with a dot (not very convenient) or creating an alias which will run the script in the current shell as follows

alias pop='. ~/bin/'
alias push='~/bin/' # Put these aliases in the .bashrc or .profile

Hope you may find it useful. Share and enjoy!*

* "Share and Enjoy" is the slogan of the Sirius Cybernetics Corporation ;)

May 4, 2012

One of the reasons why I stick with Fedora

The delta rpm feature of yum reduces the amount of data download for updates.
Total download size: 97 M
Is this ok [y/N]: y
Downloading Packages:
Setting up and reading Presto delta metadata
updates/prestodelta | 889 kB 00:24
Processing delta metadata
Download delta size: 4.3 M
Finishing rebuild of rpms, from deltarpms
<locally rebuilding deltarpms> | 95 MB 00:37
Presto reduced the update size by 96% (from 95 M to 4.3 M).