man tcptraceroute

The large context number (-C 1000) is a bit of a hack, but in most of my use cases, it makes sure I'll see the whole log output.

This command is much quicker than the alternative of "sort | uniq -c | sort -n".

with discard wilcards in bash you can "tail" newer logs files to see what happen, any error, info, warn...

/path/ is the root folder of the DVD, not the VIDEO_TS folder.

This will print out the third column of every line in FILE. Useful for many files in /proc or *csv data.

Often, the very next command after the cd command is 'ls', so why not combine them?. Tested on a Red Hat derivative and Mac OS X Leopard

Update: changed ${1:-$HOME} to "${@:-$HOME}" to accomodate directories with spaces in the names

Useful if you want get all the md5sum of files but you want exclude some directories. If your list of files is short you can make in one command as follow:

Alternatively you can specify a different command to be executed on the resulting files.

Report fstat(2) and fcntl(2) information for all open files in each process.

This example summarize size of all pdf files in /tmp directory and its subdirectories (in bytes).

Replace "/tmp" with directory path of your choice and "\*pdf" or even "-iname \*pdf" with your own pattern to match specific type of files. You can replace also parameter for du to count kilo or megabytes, but because of du rounding the sum will not be correct (especially with lot of small files and megabytes counting).

In some cases you could probably use sth like this:

But be aware that this second command CANNOT count files with spaces in their names and it will cheat you, if there are some files matching the pattern that you don't have rights to read. The first oneliner is resistant to such problems (it will not count sizes of files which you cant read but will give you correct sum of rest of them).

grep 'HOME.*' data.txt | awk '{print $2}' | awk '{FS="/"}{print $NF}'

OR

awk '/HOME/ {print $2}' data.txt | awk -F'/' '{print $NF}'

In this example, we are having a text file that is having several entries like:

---

c1 c2 c3 c4

this is some data

HOME /dir1/dir2/.../dirN/somefile1.xml

HOME /dir1/dir2/somefile2.xml

some more data

---

for lines starting with HOME, we are extracting the second field that is a 'file path with file name', and from that we need to get the filename only and ignore the slash delimited path.

The output would be:

somefile1.xml

somefile2.xml

(In case you give a -ive - pls give the reasons as well and enlighten the souls :-) )

You need to install imagemagick.

On Debian type:

# apt-get install imagemagick

exclude-dir option requires grep 2.5.3

The ssh command alone will execute the sudo command remotely, but the password will be visible in the terminal as you type it. The two stty commands disable the terminal from echoing the password back to you, which makes the remote sudo act as it does locally.

I use this to generate a playlist with all the podcasts I listen to.

Ordered from most recent to older.

The pipe to head removes the listing of . as the largest directory.

Useful for cron jobs -- all output will be logged but only errors will cause email to be sent. NB the order of "2>&1" and ">> logfile" is important, it doesn't work if you reverse them (everything goes to the logfile, nothing left for tee).