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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 15:04:21 141
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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Remove Thumbs.db files from folders

Search specified $TEXT1 and Replace that by specified arg ($TEXT2)

clone directory structure

dir1 and all its subdirs and subdirs of subdirs ... but *no files* will be copied to dir2 (not even symbolic links of files will be made). To preserve ownerships & permissions: $ cp -Rps dir1 dir2 Yes, you can do it with $ rsync -a --include '*/' --exclude '*' /path/to/source /path/to/dest too, but I didn't test if this can handle attributes correctly (experiment rsync command yourself with --dry-run switch to avoid harming your file system) You must be in the parent directory of dir1 while executing this command (place dir2 where you will), else soft links of files in dir2 will be made. I couldn't find how to avoid this "limitation" (yet). Playing with recursive unlink command loop maybe? PS. Bash will complain, but the job will be done.

Command to rename multiple file in one go

Rename all (jpg) files written as 3 number in 4 numbers.

Useful if you have a list of images called 1 2 3 4 and so on, you can adapt it to rewrite it as 4 (in this example) 0-padded number.

Generic shell function for modifying files in-place

Some commands (such as sed and perl) have options to support in-place editing of files, but many commands do not. This shell function enables any command to change files in place. See the sample output for many examples. The function uses plain sh syntax and works with any POSIX shell or derivative, including zsh and bash.

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Remove all cached images for icons related to your profile

Run inside Command Prompt (cmd.exe) as admin. Note that you must close explorer.exe first, and even so some files will not be deleted, will say "Access is denied." To definitely delete them enter with another admin user or from other operating system and access the drive.

print contents of file from line 1 until we match regex

Start printing the contents of filename to stdout, until a matching line to regex is found, then stop.

Make sudo forget password instantly

By default sudo 'remembers' password for a few minutes, so that you do not need to re-enter password for a series of sudo commands that might follow within a short time duration. However, sometime you might want sudo to instantly 'forget' the password. (Next sudo command will need you to reenter the password) Credit: I first learned this while listening to one of the 'tuxradar' podcast.

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