Ever need to output an entire directory and subdirectory contents to a file? This is a simple one liner but it does the trick every time. Omit -la and use only -R for just the names

Renames all the jpg files as their timestamps with ".jpg" extension.

Useful for deleting old unused log files.

I'm working in a group project currently and annoyed at the lack of output by my teammates. Wanting hard metrics of how awesome I am and how awesome they aren't, I wrote this command up.

It will print a full repository listing of all files, remove the directories which confuse blame, run svn blame on each individual file, and tally the resulting line counts. It seems quite slow, depending on your repository location, because blame must hit the server for each individual file. You can remove the -R on the first part to print out the tallies for just the current directory.

Output manpage as plaintext using cat as pager: man -P cat commandname

And redirect its stdout into a file: man -P cat commandname > textfile.txt

Example: man -P cat ls > man_ls.txt

Find when debian packages were installed on a system.

This command finds the 5 (-n5) most frequently updated logs in /var/log, and then does a multifile tail follow of those log files.

Alternately, you can do this to follow a specific list of log files:

sudo tail -n0 -f /var/log/{messages,secure,cron,cups/error_log}

Creates a PDF (over ps as intermediate format) out of any given manpage.

Other useful arguments for the -T switch are dvi, utf8 or latin1.

When a fs hangs and you've just one console, even # ls could be a dangerous command. Simply put a trailing "&" and play safe

order the files by modification (thanks stanishjohnd) time, one file per output line and filter first 10

You can convert any UNIX man page to .txt

Sort ls output of all files in current directory in ascending order

Just the 20 biggest ones:

A variant for the current directory tree with subdirectories and pretty columns is:

And finding the subdirectories consuming the most space with displayed block size 1k:

The URL can then be pasted with a middle click.

This is probably useful when trying to explain problems over instant messaging when you don't have some sort of shared desktop.

added alias in ~/.bashrc

alias lf='find ./* -ctime -1 | xargs ls -ltr --color'

To sort hidden files first, simply switch the two inner `ls` commands.

I have this aliased to `dira`

`dir` is aliased to the simpler version with no hidden files:

This works on my ubuntu/debian machines.

I suspect other distros need some tweaking of sort and cut.

I am sure someone could provide a shorter/faster version.

Yeah, there are many ways to do that.

Doing with sed by using a for loop is my favourite, because these are two basic things in all *nix environments. Sed by default does not allow to save the output in the same files so we'll use mv to do that in batch along with the sed.

Ok so it's rellay useless line and I sorry for that, furthermore that's nothing optimized at all...

At the beginning I didn't managed by using netstat -p to print out which process was handling that open port 4444, I realize at the end I was not root and security restrictions applied ;p

It's nevertheless a (good ?) way to see how ps(tree) works, as it acts exactly the same way by reading in /proc

So for a specific port, this line returns the calling command line of every thread that handle the associated socket

A powerfull way to rename file using sed groups.

& stand for the matched expression.

\1 referes to the first group between parenthesis. \2 to the second.