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Return IP Address

Tested on Solaris.
This is sample output - yours may be different.
-1

/usr/sbin/ifconfig -a|awk -F" " 'NR==4{print $2}'

elZaphod · 2009-12-04 18:41:29 4
Return threads count of a process

Source: http://superuser.com/questions/49408/how-do-i-monitor-or-view-the-thread-count-of-a-certain-process-on-aix Show Sample Output
This is sample output - yours may be different.
```
THCNT
   2
```
3

ps -o thcount -p <process id>

lukasz · 2009-12-04 14:39:53 4
View the newest xkcd comic.
This is sample output - yours may be different.
1

wget `lynx --dump http://xkcd.com/|grep png`

metalx1000 · 2009-12-03 23:10:22 3
Get the time from NIST.GOV

The format is JJJJJ YR-MO-DA HH:MM:SS TT L DUT1 msADV UTC(NIST) OTM and is explained more fully here: http://tf.nist.gov/service/acts.htm Show Sample Output
This is sample output - yours may be different.
```
cat </dev/tcp/time.nist.gov/13

55168 09-12-03 20:32:43 00 0 0 350.2 UTC(NIST) * 
```
8

cat </dev/tcp/time.nist.gov/13

drewk · 2009-12-03 21:40:14 11
Friendly command-not-found message.

This will give you a friendly warning if a command doesn't exists. Show Sample Output
This is sample output - yours may be different.
```
$ aptitypo
...
```
-1

command_not_found_handle() { echo 6661696c626f61742e2e2e0a | xxd -p -r; }

unixmonkey7301 · 2009-12-03 21:33:35 4
View the newest xkcd comic.

I wasn't sure how to display the image, so I thought I'd try xml for a different twist. Show Sample Output
This is sample output - yours may be different.
```
<?xml version="1.0"?>
<xkcd>
<item>
<title>Spinal Tap Amps</title>
<comment>Wow, that's less than $200 per ... uh ... that's a good deal!</comment>
<image>http://imgs.xkcd.com/comics/spinal_tap_amps.png</image>
</item>
</xkcd>
```
0

curl -s 'xkcd.com' | awk -F\" '/^<img/{printf("<?xml version=\"1.0\"?>\n<xkcd>\n<item>\n <title>%s</title>\n <comment>%s</comment>\n <image>%s</image>\n</item>\n</xkcd>\n", $6, $4, $2)}'

putnamhill · 2009-12-03 19:49:37 3
View the newest xkcd comic.

Same thing just a different way to get there. You will need lynx
This is sample output - yours may be different.
-1

lynx --dump --source http://www.xkcd.com | grep `lynx --dump http://www.xkcd.com | egrep '(png|jpg)'` | grep title | cut -d = -f2,3 | cut -d '"' -f2,4 | sed -e 's/"/|/g' | awk -F"|" ' { system("display " $1);system("echo "$2); } '

solarislackware · 2009-12-03 18:53:57 3
Watch those evil Red Hat states code D Uninterruptible sleep (usually IO).

On my cluster a D in the states column means it is time to reboot the server.
This is sample output - yours may be different.
0

watch -n 1 "ps aux | sed -n 's/ D /&/p'"

lunarblu · 2009-12-03 18:22:44 3
Fill up disk space (for testing)

For disk space constraint testing. Leaves a little space available for creating temp files, etc. Easily free up the used disk space again by deleting the dummy00 file. Can tailor the testing by building smaller 'blocks' to suit the needs of the testing. WARNING: do not do this to the '/' (root) filesystem unless you know what you are doing... on some systems it could crash the OS.
This is sample output - yours may be different.
-3

dd if=/dev/zero of=/fs/to/fill/dummy00 bs=8192 count=$(df --block-size=8192 / | awk 'NR!=1 {print $4-100}')

arcege · 2009-12-03 15:20:18 5
Mirror the NASA Astronomy Picture of the Day Archive

Mirror the entire NASA Astronomy Picture of the Day archive, all the way from 1995. The archive is close to 2.5 GB, with lots of files, so give it some time. The logs can be redirected to a file using '-o somefile'. You might also want to try '-nH' and the '--cut-dirs' options
This is sample output - yours may be different.
3

wget -t inf -k -r -l 3 -p -m http://apod.nasa.gov/apod/archivepix.html

ninadsp · 2009-12-03 10:27:57 7
Strace all signals processes based on a name ( The processes already started... ) with bash built-in

Especially for sysadmins when they don't want to waste time to add -p flag on the N processes of a processname. In the old school, you did ; pgrep processname and typing strace -f -p 456 -p 678 -p 974... You can add -f argument to the function. That way, the function will deal with pgrep to match the command-line. Example : processname -f jrockit
This is sample output - yours may be different.
3

straceprocessname(){ x=( $(pgrep "$@") ); [[ ${x[@]} ]] || return 1; strace -vf ${x[@]/#/-p }; }

sputnick · 2009-12-03 00:04:39 8
search for a pattern (regex) in all text files (ignoring binary files) in a directory tree
This is sample output - yours may be different.
-2

egrep -i "somepattern" `find . -type f -print`

dudleyperkins · 2009-12-02 16:00:46 5
generate random password

for Mac OS X Show Sample Output
This is sample output - yours may be different.
```
rUYIwxq4
```
8

openssl rand -base64 6

gikku · 2009-12-02 10:10:58 12
ruby one-liner to get the current week number
This is sample output - yours may be different.
3

ruby -rdate -e 'p DateTime.now.cweek'

Tekhne · 2009-12-02 02:33:51 33
yesterday
This is sample output - yours may be different.
-4

perl -lne 'use POSIX; print strftime("%Y-%m-%d", localtime(time() - 86400));'

unixmonkey7263 · 2009-12-01 22:31:34 14
perl one-liner to get the current week number

Not perl but shorter.
This is sample output - yours may be different.
20

date +%V

putnamhill · 2009-12-01 21:40:56 9
Mail text file (/tmp/scream-dump) contents from linux box with subject(scream-dump)
This is sample output - yours may be different.
-1

mail -s scream-dump user@example.com < /tmp/scream-dump

imsaar · 2009-12-01 21:04:22 3
Convert encoding of given files from one encoding to another
This is sample output - yours may be different.
4

iconv -f utf8 -t utf16 /path/to/file

imsaar · 2009-12-01 21:02:58 3
find all writable (by user) files in a directory tree (use 4 for readable, 1 for executable)
This is sample output - yours may be different.
1

find . -type f -perm +200 -print

imsaar · 2009-12-01 21:01:46 3
ruby one-liner to get the current week number
This is sample output - yours may be different.
-1

ruby -e 'require "date"; puts DateTime.now.cweek'

imsaar · 2009-12-01 20:59:18 3
lists contents of a tar file
This is sample output - yours may be different.
0

tar -tf /path/to/file.tar

imsaar · 2009-12-01 20:58:07 4
perl one-liner to get the current week number
This is sample output - yours may be different.
-3

perl -e 'use Date::Calc qw(Today Week_Number); $weekn = Week_Number(Today); print "$weekn\n"'

imsaar · 2009-12-01 20:56:13 3
search for a pattern (regex) in all text files (ignoring binary files) in a directory tree
This is sample output - yours may be different.
-1

find . -type f | perl -lne 'print if -T;' | xargs egrep "somepattern"

unixmonkey7263 · 2009-12-01 19:12:03 6
Find dead symbolic links
This is sample output - yours may be different.
1

find . -type l | perl -lne 'print if ! -e'

unixmonkey7263 · 2009-12-01 19:08:45 5
Drop all tables from a database, without deleting it
This is sample output - yours may be different.
1

MYSQL="mysql -h HOST -u USERNAME -pPASSWORD -D DB_NAME" ; $MYSQL -BNe "show tables" | awk '{print "set foreign_key_checks=0; drop table `" $1 "`;"}' | $MYSQL unset MYSQL

gadget00 · 2009-12-01 17:42:38 7
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Find usb device in realtime

Using this command you can track a moment when usb device was attached.

Remove a line in a text file. Useful to fix

In this case it's better do to use the dedicated tool

Unpack .tgz File On Linux

With -a you don't care about file type (bz2, gzip, etc.)

Update all packages installed via homebrew

As of March 7, 2012: $ brew update - downloads upgraded formulas $ brew upgrade [FORMULA...] - upgrades the specified formulas $ brew outdated - lists outdated installations Note updating all packages may take an excruciatingly long time. You might consider a discriminating approach: run `brew outdated` and select specific packages needing an upgrade. For more information see homebrew's git repository: https://github.com/mxcl/homebrew

Run a command when a file is changed

list file descriptors opened by a process

Useful for examining hostile processes (backdoors,proxies)

Calculate files' size

set wallpaper on windowmaker in one line

set directly the wallpaper on windowmaker , use this command with display of imagemagick :)

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

Find and delete oldest file of specific types in directory tree

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.

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