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Dump
This is sample output - yours may be different.
-1

jmap -dump:live,format=b,file=o.hprof pid ; jstack -l pid > /oracle/ora_app1/p.tdump

Plancton · 2015-12-15 12:34:09 13

Change default terminal emulator

Show Sample Output

-1

update-alternatives --config x-terminal-emulator

l1feh4ck3r · 2009-02-13 13:45:43 8

Show Network IP and Subnet

same thing as the other
This is sample output - yours may be different.
-1

ipcalc $(ifconfig eth0 | grep "inet addr:" | cut -d':' -f2,4 | sed 's/.+Bcast:/\//g') | awk '/Network/ { print $2 } '

solarislackware · 2009-12-05 15:00:32 3
print shared library dependencies
This is sample output - yours may be different.
-1

ldd path_to_executable

yababay · 2010-09-06 17:07:39 3
Lookaround in grep

tutorial @ http://www.regular-expressions.info/lookaround.html also see @ http://stackoverflow.com/questions/5080988/how-to-extract-string-following-a-pattern-with-grep-regex-or-perl for tip: `grep -Po 'name="\K.*?(?=")' file.txt` Show Sample Output
This is sample output - yours may be different.
```
$ John
```
-1

echo "John's" | grep -Po '\b\w+(?<!s)\b'

evandrix · 2011-07-15 12:08:18 6
print shared library dependencies

use this to avoid executing the target app
This is sample output - yours may be different.
-1

function ldd(){ objdump -p $1 | grep -i need; }

jyf · 2010-09-07 02:44:59 3
Print the local ip on a wireless connection

On wired connections set 'eth0' instead of 'wlan0'
This is sample output - yours may be different.
-1

sudo ifconfig wlan0 | grep inet | awk 'NR==1 {print $2}' | cut -c 6-

mouths · 2013-02-18 14:10:07 8
Save the network interface info into a text file, so that you can re-apply it later

On Windows 2000 or newer, you can use the command line to save the current network interface info. You can then edit the text file and re-apply it using the netsh -f command (or netsh exec). Keep a bunch of text files around to quickly switch connection info without using extra software. http://en.wikipedia.org/wiki/Netsh http://support.microsoft.com/kb/242468 http://thelazyadmin.com/blogs/thelazyadmin/archive/2005/04/04/Using-Netsh-to-Manage-Network-Interfaces-Part-2.aspx Show Sample Output
This is sample output - yours may be different.
```
# ----------------------------------
# Interface IP Configuration
# ----------------------------------
pushd interface ip
# Interface IP Configuration for "builtin"
set address name="builtin" source=dhcp
set dns name="builtin" source=static addr=192.168.0.12 register=PRIMARY
add dns name="builtin" addr=192.168.0.1 index=2
set wins name="builtin" source=dhcp
popd
# End of interface IP configuration
```
-1

netsh interface ip dump > current-interfaces.txt

piyo · 2009-02-13 15:13:05 8
Return Dropbox folder location.

Newer versions of Dropbox let you choose the location for your Dropbox folder. If you use script to put things into your Dropbox folder (todo list, screenshots, torrents etc.) but have the Dropbox folder in different locations on your other computers this lets you use the same script on all systems without having to tell it where the Dropbox folder is. Show Sample Output
This is sample output - yours may be different.
```
/home/user/Dropbox
/media/backup/Dropbox
/really/deep/level/subdirectory/for/some/reason/Dropbox
```
-1

sqlite3 $HOME/.dropbox/config.db "select value from config where key like '%dropbox_path%'"

mobilediesel · 2011-06-05 08:26:02 13
Broadcast your shell thru ports 5000, 5001, 5002 ...

solution that works for me
This is sample output - yours may be different.
-1

script -qf | tee >(nc -l -p 5000)

nesses · 2013-04-13 00:22:02 5
Clearcase find branch
This is sample output - yours may be different.
-1

ct find -avobs -nxname -element 'brtype(branch_name)' -print 2>/dev/null

naseer · 2009-02-05 17:02:29 23
batch convert OGG to WAV
This is sample output - yours may be different.
-1

for f in *.ogg ; do mplayer -quiet -vo null -vc dummy -ao pcm:waveheader:file="$f.wav" "$f" ; done

ideasman42 · 2009-02-23 10:09:10 8
one line command to recursively add all jar files in current folder to java class path

a pretty simple script when running java programs from command line Show Sample Output
This is sample output - yours may be different.
```
.:/home/hyhu/Ubuntu One/javalibs/a.jar:/home/hyhu/Ubuntu One/javalibs/b.jar:/home/hyhu/Ubuntu One/javalibs/c.jar:/home/hyhu/Ubuntu 
```
-1

CLASSPATH=.; export CLASSPATH=$CLASSPATH$(find "$PWD" -name '*.jar' -type f -printf ':%p\n' | sort -u | tr -d '\n'); echo $CLASSPATH

dexterhu · 2011-03-11 19:21:15 3
Create web site ssl certificates
This is sample output - yours may be different.
-1

openssl req -new -x509 -extensions v3_ca -days 1100 -subj "/C=CA/ST=CA/L=SomeCity/O=EXAMPLE Inc./OU=Web Services/CN=example.com/emailAddress=postmaster@example.com" -nodes -keyout web.key -out web.crt

plasticdoc · 2011-06-05 08:57:21 3
Countdown Clock

I find the other timers are inaccurate. It takes some microseconds to perform the date function. Therefore, using date/time math to calculate the time for us results in millisecond accuracy. This is tailored to the BusyBox date function. May need to change things around for GNU date function. Show Sample Output
This is sample output - yours may be different.
```
00:03:00
```
-1

let T=$(date +%s)+3*60;while [ $(date +%s) -le $T ]; do let i=$T-$(date +%s); echo -ne "\r$(date -d"0:0:$i" +%H:%M:%S)"; sleep 0.3; done

davidk · 2019-10-22 15:04:21 140
Copy files from one dir to another using tar.

Add z to the flags to enable compression.
This is sample output - yours may be different.
-1

tar cf - . | (cd /new/dir; tar xvf -)

jauderho · 2009-03-09 20:30:34 12
Print just line 4 from a textfile

using tail first won't do it because tail counts from the bottom of the file. You could do it this way but I don't suggest it
This is sample output - yours may be different.
-1

head -n X | tail -n 1

infinull · 2010-07-08 22:06:39 4
recursively add all sub folders with executable file of current folder to PATH environment variable

(1) don't run twice, or the same folder will occur in $PATH. (2) otherwise you need to start a new terminal Show Sample Output
This is sample output - yours may be different.
```
blah blah blah ..... (too long)
```
-1

export PATH=$PATH$(find "$PWD" -name '.*' -prune -o -type f -a -perm /u+x -printf ':%h\n' | sort -u | tr -d '\n'); echo $PATH

dexterhu · 2011-03-11 19:31:17 7
Purge application's residual config & orphans
This is sample output - yours may be different.
-1

dpkg -l | sed '/^rc/!d;s/^[^ ]* [^ ]* $[^ ]*$.*/\1/' | xargs -r sudo apt-get -y purge

plasticdoc · 2011-06-05 09:19:27 3
Prints line numbers

Works in RHEL5 and derivatives.
This is sample output - yours may be different.
-1

nl <filename>

SuperFly · 2010-01-06 16:14:43 3
Find default gateway
This is sample output - yours may be different.
-1

route -n | grep "^0\." | awk '{print "Gateway to the World: "$2", via "$NF""}'

bandie91 · 2010-08-09 11:55:37 26
SSH with sql like commad

I will ssh to ip address 192.168.2.1 with user name user. "connect user 192.168.1.1" is same as "ssh user@192.168.1.1"
This is sample output - yours may be different.
-1

add "ssh $1@$2" in /usr/sbin/connect with executable permission, now use commad "connect user 192.168.1.1"

sandeepvreddy · 2012-01-27 12:50:20 3
Realtime lines per second in a log file

logtop show number of lines per second, also classify them so you can show a "top" of every aspect of your logfile : tail -f access.log | awk '{print $1; fflush();}' | logtop
This is sample output - yours may be different.
-1

tail -f logfile | logtop

Sizeof · 2012-06-24 19:18:30 3
View open file descriptors for a process.
This is sample output - yours may be different.
-1

lsof -p <process_id> | wc -l

virtualshock · 2009-07-20 17:46:54 4
a simple alarm

this command will beep like an alarm for one minute from 18:57. you can change "1857" to your desired time. you should have alsa-oss package installed, and you should also be root or part of "audio" group.
This is sample output - yours may be different.
-1

while true; do while [ `date +%H%M` == "1857" ] ; do sleep 1s; yes | head -n 2000 > /dev/dsp; done; done;

mrwill · 2011-04-23 14:44:26 8
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Dump mySQL db from Remote Database to Local Database

You can use this to dump you database from remote db to your local db.

Delete all non-printing characters from a file

tr has some predefined sets of characters that are more convenient to use than characters codes

Show the power of the home row on the Dvorak Keyboard layout

Quick and dirty command that counts how many words can be typed just using the home row on the Dvorak Simplified Keyboard layout from a dictionary file, in this case /usr/share/dict/words. According to the regular expression supplied, each word must contain all the keys on the Dvorak home row, and no other characters. For comparison, I've shown how many words are installed in my dictionary, how many can be typed with just the Dvorak home row and how many can be typed with just the QWERTY home row in the sample output. Nearly 10 times the amount. If you want to see the words, remove the -c switch, and each word will be printed out.

Convert the contents of a directory listing into a colon-separated environment variable

Useful for making a CLASSPATH out of a list of JAR files, for example. Also: export CLASSPATH=.:$(find ./lib -name '*.jar' -printf '%p:')

April Fools' Day Prank

Add this to a fiend's .bashrc. PROMPT_COMMAND will run just before a prompt is drawn. RANDOM will be between 0 and 32768; in this case, it'll run about 1/10th of the time. \033 is the escape character. I'll call it \e for short. \e7 -- save cursor position. \e[%d;%dH -- move cursor to absolute position \e[4%dm \e[m -- draw a random color at that point \e8 -- restore position.

List all groups and the user names that were in each group

"cut" the user names from /etc/passwd and then running a loop over them.

Check disk I/O

Show a prettified list of nearby wireless APs

Lists all listening ports together with the PID of the associated process

The PID will only be printed if you're holding a root equivalent ID.

rsync directory tree including only files that match a certain find result.

'-mtime -10' syncs only files newer 10 days (-mtime is just one example, use whatever find expressions you need) printf %P: File's name with the name of the command line argument under which it was found removed. this way, you can use any src directory, no need to cd into your src directory first. using \\0 in printf and a corresponding --from0 in rsync ensures that even filenames with newline characters work (thanks syssyphus for #3808). both, #1481 and #3808 just work if you either copy the current directory (.) , or the filesystem root (/), otherwise the output from find and the source dir from rsync just don't match. #7685 works with an arbitrary source directory.

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