same, except it works on any OS with Perl installed. DOS, Windose, whatever

Ever wanted to find the most recently modified files, but couldn't remember exactly where they were in a project directory with many subdirectories? The "find" command, using a combination of "-mtime -N" and "-depth -D" can be used to find those files. If your directory structure isn't very deep, just omit the "-depth -D", but if your directory structure is very deep, then you can limit the depth of the traversal using "-depth -D", where "D" is the maximum number of directory levels to descend.

cd /

find `pwd` -name '.*' -prune -o \( -name *.h -o -name *.cpp \) -print | cscope -bi-

export CSCOPE_DB=/cscope.out

vim +'set cst'

Found this useful for scripts where I needed to work with the machine's IP. If $DEVICE is not specified, this will return all IPs on the machine. If $DEVICE is set to a network adapter, it will return just that adapter's IP.

Loops over array of a system var, splits its values and puts the values into %A, %B, %C, %D, and so on.

Create array before, like

and

Be sure to replace %A, %B, etc. with %%A, %%B, etc. when using this from inside of batch files.

Many Mac OS X programs, especially those in Microsoft:Office, create ASCII files with lines terminated by CRs (carriage returns). Most Unix programs expect lines separated by NLs (newlines). This little command makes it trivial to convert them.

HTP (HTTP Time Protocol) is an alternative way of getting "good enough" synchronized time. htpdate will give you near-second accuracy.

It works where NTP/SNTP does not because of firewalls and proxies. Of course, if NTP/SNTP can be used, use that instead.

http://www.clevervest.com/twiki/bin/view/HTP

htp is not in Ubuntu!

Simple and fast variant, not using external programs. Another variation:

HashKnownHosts must be off, of course.

I know you can use pidof but with this you can know the specific PID with his command arguments (useful if you're running various proccess with same application)

Actually $! is an internal variable containing PID of the last job in background.

More info: http://tldp.org/LDP/abs/html/internalvariables.html#PIDVARREF

Using $! for job control:

be careful where you execute this from

do a 'sudo ls' beforehand to prime sudo to not ask for your password

lgrep regex [dir]

Shows you all listening tcp/udp ports, and what program has them open(depending on rights)

I can't put the last ^2 with seq, so I reverse it to delete the last +N. So for doing sum(N^2) you have to do sum((N+1)^2). Must be a better way.