Unix Commands on Shivanand Velmurugan — Product leader. Systems thinker.

Getting git status on multiple directories

Mon, 31 Mar 2014 00:00:00 +0000

At any given time, I have a handful of git repositories that I work on. While typing in the command-line is great, it getting tiring when you have a several directories that you have to manually change to and check. The “git status” command can take the git repo and the working directory as input. That, and a little bash programming to the rescue. The following command, executes git status in every subdirectory that is a git repository.

Working with rpms (extract, list contents)

Sun, 17 Feb 2013 00:00:00 +0000

Unix. I love thee!

Extract an rpm without installing in to the current directory (really, the rpm command should support this):

$ rpm2cpio myrpmfile.rpm | cpio -idmv

*i: Restore archive

*d: Create leading directories where needed

*m: Retain previous file modification times when creating files

*v: Verbose i.e. display progress

List contents of an rpm:

$ rpm -qlp myrpmfile.rpm

source

More unix goodness

Mon, 21 May 2012 00:00:00 +0000

Ohh the unix command prompt, I love thee! Can you guess what these commands do?

1
2

# grep -l <regex>  
# find . -name <regex> -delete

Unix: removing duplicates from a file

Tue, 09 Sep 2008 00:00:00 +0000

Over the last few months, I have re-discovered some unix commands (it’s been such a long time)

Eliminate duplicate lines from a file

#sort -u filename > filename.new

List all lines that do not match a condition

#grep -v ajsk filename

Copy contents of two files to one

#cat file1 file2 > file3

Append output of a command to a file

#cat file1 >> file2