Commands by cp

Commands by cp (11)

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lazy SQL QUERYING

alias for psql command line; works similar for Oracles sqlplus commandline interface. if you do not provide stdin you will end up in the db shell. Show Sample Output
This is sample output - yours may be different.
```
$ QUERY <<SQL
> SELECT count(*) 
> FROM Resource r;
> SQL
count
78588
(1 row)
$ 
```
2

alias QUERY='psql -h $MYDBHOST -p 5432 -d $MYDB -U $MYLOGIN --no-align'

cp · 2011-04-08 12:44:33 4
mirrors directory to a ftp server

http://lftp.yar.ru/
This is sample output - yours may be different.
7

lftp -ulogin,passwd -e "mirror --reverse /my/from/dir/ /ftp/target/dir/" ftp.server.xx

cp · 2011-04-01 12:40:11 6
connects to a serial console

e.g., 'screen -L /dev/ttyUSB0 38400' listens to your Holux M-241 GPS logger and turns on automatic logging Show Sample Output
This is sample output - yours may be different.
```
screen /dev/ttyUSB0 38400 
```
6

screen /dev/ttyS0 9600

cp · 2011-03-09 07:56:34 6
list all file extensions in a directory

... plus do a sort according frequency Show Sample Output
This is sample output - yours may be different.
```
cp@lilith:~ > find Downloads/ -type f | awk -F'.' '{print $NF}' |sort|uniq -c|sort -g |tail
    133 svg
    133 svn-base
    192 xpm
    199 o
    207 uue
    301 cc
    441 cpp
    503 c
   1344 java
   1398 h
```
11

find . -type f | awk -F'.' '{print $NF}' | sort| uniq -c | sort -g

cp · 2011-02-14 09:15:29 9
tar and remove files which are older that 100 days

tar does not have a -mtime option as find. tar appends all the file to an existing tar file.
This is sample output - yours may be different.
4

find . -type f -mtime +100 -exec tar rvf my.tar --remove-files {} \;

cp · 2011-01-26 06:13:19 4
runs a X session within your X session

http://www.debian-administration.org/article/Running_multiple_X11_sessions
This is sample output - yours may be different.
10

ssh -C -Y -l$USER xserver.mynet.xx 'Xnest -geometry 1900x1150 -query localhost'

cp · 2010-07-22 06:26:35 6
Use Kernighan & Ritchie coding style in C program
This is sample output - yours may be different.
9

indent -kr hello.c

cp · 2010-07-14 07:16:15 5
'hpc' in the box - starts a maximum of n compute commands modulo n controlled in parallel

the block of the loop is useful whenever you have huge junks of similar jobs, e.g., convert high res images to thumbnails, and make usage out of all the SMP power on your compute box without flooding the system. note: c is used as counter and the random sleep r=`echo $RANDOM%5 |bc`; echo "sleep $r"; sleep $r is just used as a dummy command. Show Sample Output
This is sample output - yours may be different.
```
$ c=0; n=8; while true; do r=`echo $RANDOM%5 |bc`; echo "sleep $r"; sleep $r& 2>&1 >/dev/null && ((c++)); [ `echo "$c%$n" | bc` -eq 0 ] && echo "$c waiting" && wait; done 
sleep 1
[1] 25900
sleep 3
[2] 14967
sleep 0
[3] 3011
sleep 0
[4] 24050
sleep 3
[5] 25533
sleep 4
[6] 9794
sleep 3
[7] 17325
sleep 2
[8] 19922
8 waiting
sleep 4
[9] 29693
sleep 4
[10] 1863
sleep 0
[11] 21993
sleep 1
[12] 1450
sleep 2
[13] 23873
sleep 1
[14] 24563
sleep 3
[15] 625
sleep 0
[16] 9172
16 waiting
...
```
5

c=0; n=8; while true; do r=`echo $RANDOM%5 |bc`; echo "sleep $r"; sleep $r& 2>&1 >/dev/null && ((c++)); [ `echo "$c%$n" | bc` -eq 0 ] && echo "$c waiting" && wait; done

cp · 2010-07-08 13:56:28 8
connects to a serial console

cu (call UNIX) establishes a full-duplex connection to another machine (*BSD) using a serial console. It becames more useful than screen if you have to send a BREAK signal. using cu just type "~#". man cu http://www.openbsd.org/cgi-bin/man.cgi?query=cu&apropos=0&sektion=0&manpath=OpenBSD+Current&arch=i386&format=html Show Sample Output
This is sample output - yours may be different.
```
$ cu -l /dev/ttyUSB1 -s 9600
# reboot
syncing disks... done
rebooting

Resetting ... 




Sun Blade 100 (UltraSPARC-IIe), No Keyboard
OpenBoot 4.0, 768 MB memory installed, Serial #51173105.
Ethernet address 0:3:ba:c:d6:f1, Host ID: 830cd6f1.



Rebooting with command: boot                                          
Boot device: /pci@1f,0/ide@d/disk@0,0:a  File and args: 
OpenBSD IEEE 1275 Bootblock 1.3
..>> OpenBSD BOOT 1.4
Trying bsd...
Booting /pci@1f,0/ide@d/disk@0,0:a/bsd
```
5

cu -s 9600 -l /dev/ttyS0

cp · 2010-07-08 06:33:55 11

computes the most frequent used words of a text file

cat WAR_AND_PEACE_By_LeoTolstoi.txt | tr -cs "[:alnum:]" "\n"| tr "[:lower:]" "[:upper:]" | awk '{h[$1]++}END{for (i in h){print h[i]" "i}}'|sort -nr | cat -n | head -n 30

cp · 2010-07-05 06:39:20 22

sends a postscript file to a postscript printer using netcat
This is sample output - yours may be different.
10

cat my.ps | nc -q 1 hp4550.mynet.xx 9100

cp · 2010-07-05 06:12:12 8

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Simple but useful code

I'd be glad to explain the code, but I can't access or display links due to security reasons. Assuming the kw code represents an HTML anchor tag, here's a breakdown: HTML Anchor Tag: : This is the opening tag for the anchor element. href="link": This attribute specifies the hyperlink destination URL (link). When clicked, the user's browser navigates to the provided URL. kw: This is the content displayed within the anchor tag. It can be text or an image. In this case, it's likely text that says "kw". : This is the closing tag for the anchor element.

Delete specific sender in mailq

Recursively execute command on directories (.svn, permissions, etc)

The above command will set the GID bit on all directories named .svn in the current directory recursively. This makes the group ownership of all .svn folders be the group ownership for all files created in that folder, no matter the user. This is useful for me as the subversion working directory on my server is also the live website and needs to be auto committed to subversion every so often via cron as well as worked on by multiple users. Setting the GID bit on the .svn folders makes sure we don't have a mix of .svn metadata created by a slew of different users.

Open Remote Desktop (RDP) from command line having a custom screen size

This example uses xfreerdp, which builds upon the development of rdesktop. This example usage will also send you the remote machine's sound.

[git] Output remote origin from within a local repository

Great way to quickly grasp if a locally cloned repository originates from e.g. github or elsewhere.

Insert the last argument of the previous command

list block devices

Shows all block devices in a tree with descruptions of what they are.

Add to Instapaper

Adds URL to Instapaper. Usage: instapaper-add user@example.com 12345 http://www.commandlinefu.com/

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"

pretend to be busy in office to enjoy a cup of coffee

Create a progress dialog with custom title and text using zenity.

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Commands by cp (11)

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