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Create new repo in Cobbler for CentOS 5.3 updates

Add a repo to cobbler. To download all the repository contents the command is: cobbler reposync
This is sample output - yours may be different.
-1

cobbler repo add --name=CentOS-5.3-i386-updates --mirror=http://mirror3.mirror.garr.it/mirrors/CentOS/5.3/updates/i386/

w00binda · 2009-04-27 10:18:45 5
Laminate files line by line

Lam is a command available on Bsd (I've tested it on OpenBSD).Is useful for laminate a file line by line. The -f option set the field width ( -f min.max ). Show Sample Output
This is sample output - yours may be different.
```
setg
 
# ht
#
html
 
# ma
#
manp
 
# sa
# Th
#
samp
 
# re
#
read
```
0

lam -f 1.4 myfile

servermanaged · 2009-04-26 19:31:22 12
download a specific file

download a specific file with -f to not display errors and -O to write output to a file named as the remote file. Show Sample Output
This is sample output - yours may be different.
```
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
 11 1621M   11  192M    0     0  1003k      0  0:27:34  0:03:16  0:24:18 1119k
```
-7

curl -f -O http://pcbsd.fastbull.org/7.0.2/i386/PCBSD7.0.2-x86-DVD.iso

battavia · 2009-04-26 07:23:31 13
Connect to all running screen instances

There was another line that was dependent on having un-named screen sessions. This just wouldn't do. This one works no matter what the name is. A possible improvement would be removing the perl dependence, but that doesn't effect me.
This is sample output - yours may be different.
2

for i in `screen -ls | perl -ne'if(/^\s+\d+\.([^\s]+)/){print $1, " "}'`; do gnome-terminal -e "screen -x $i"; done

hank · 2009-04-25 22:39:24 7
Convert Raw pictures to jpg
This is sample output - yours may be different.
0

for img in $( ls *.CR2 ); do convert $img $img.jpg; done

bass000 · 2009-04-25 19:11:52 7
Get a summary of network devices in the system

Basically an improvement on an earlier ethtool command line. Show Sample Output
This is sample output - yours may be different.
```
# eth0
	Speed: Unknown! (65535)
	Link detected: no
# eth1
	Speed: 100Mb/s
	Link detected: yes
# lo
	Link detected: yes
# pan0
	Link detected: yes
# tap1
	Speed: 10Mb/s
	Link detected: no
```
0

for i in /sys/class/net/*; do e=`basename $i`; echo "# $e"; sudo ethtool $e | grep -E "Link|Speed" ; done

hank · 2009-04-25 14:32:08 10
Watch Network Service Activity in Real-time
This is sample output - yours may be different.
101

lsof -i

hank · 2009-04-25 14:24:04 24
Create directory named after current date

Not a discovery but a useful one nontheless. In the above example date format is 'yyyymmdd'. For other possible formats see 'man date'. This command can be also very convenient when aliased to some meaningful name: alias mkdd='mkdir $(date +%Y%m%d)'
This is sample output - yours may be different.
11

mkdir $(date +%Y%m%d)

thebodzio · 2009-04-25 14:16:45 13
Propagate a directory to another and create symlink to content

Lndir create from source directory to destination directory a full symlink tree of all contents of source directory, really useful for propagate changes from a directory to another.
This is sample output - yours may be different.
4

lndir sourcedir destdir

servermanaged · 2009-04-24 18:30:29 8
Display lines with a given string

Look search for lines in a file that beginning with a given string. Same as $ grep ^n /etc/passwd Show Sample Output
This is sample output - yours may be different.
```
# look mysql /etc/group
mysql:x:125:
```
-2

look mysql /etc/group

servermanaged · 2009-04-24 18:20:20 6
Use md5 to generate a pretty hard to crack password

You can also use sha1sum and variants for longer passwords Show Sample Output
This is sample output - yours may be different.
```
280e25ade5d92394063ca7ae071d9f16
```
-5

echo "A great password" | md5sum

ubersoldat · 2009-04-24 14:32:56 8
set open firmware password command mode to require password to make changes
This is sample output - yours may be different.
-1

/usr/local/bin/OFPW -mode 1

tncook · 2009-04-24 13:09:17 4
Sets OpenFirmware pasword on a mac
This is sample output - yours may be different.
-1

/usr/local/bin/OFPW -pass thepassword

tncook · 2009-04-24 13:08:31 5
Show all detected mountable Drives/Partitions/BlockDevices

Yields entries in the form of "/dev/hda1" etc. Use this if you are on a new system and don't know how the storage hardware (ide, sata, scsi, usb - with ever changing descriptors) is connected and which partitions are available. Far better than using "fdisk -l" on guessed device descriptors. Show Sample Output
This is sample output - yours may be different.
```
disk:
 /dev/sda    USB-Stick
 /dev/cloop0 Disk
 /dev/hda    HARDDISK
partition:
 /dev/sda1   Partition 
 /dev/hda1   Partition
 /dev/hda2   Partition
cdrom:
 /dev/hdc    CD-ROM
floppy:
 /dev/fd0    Floppy Disk
```
13

hwinfo --block --short

Schneckentreiber · 2009-04-24 11:13:31 10
Change password in list of xml files with for and sed
This is sample output - yours may be different.
-6

for i in `ls *xml`; do sed -e 's,oldpassword,newpassword,g' $i > $i.2 && mv -f $i.2 $i ; done

irraz · 2009-04-24 08:53:40 9
Given process ID print its environment variables
This is sample output - yours may be different.
16

sed 's/\o0/\n/g' /proc/INSERT_PID_HERE/environ

unixmonkey3402 · 2009-04-23 22:58:57 8
Install a library to a remote repository
This is sample output - yours may be different.
0

mvn deploy:deploy-file -DgroupId=groupId -DartifactId=artifactId -Dversion=1.0 -Dpackaging=jar -Dfile=pathtolib -DrepositoryId=repository -Durl=url

agasea · 2009-04-23 18:13:08 4
compare two Microsoft Word documents

http://meld.sourceforge.net/ http://www.winfield.demon.nl/
This is sample output - yours may be different.
2

meld <(antiword microsoft_word_a.doc) <(antiword microsoft_word_b.doc)

peter_shook · 2009-04-23 15:14:32 8
Recursively change permissions on files, leave directories alone.
This is sample output - yours may be different.
34

find ./ -type f -exec chmod 644 {} \;

ethanmiller · 2009-04-22 21:14:36 22
compile openvm-tools

compile and install openvm-tools module in debian lenny
This is sample output - yours may be different.
-4

m-a a-i open-vm

m03hr3 · 2009-04-22 20:08:00 5
Browse shared folder when you're the only Linux user

Under Ubuntu smbclient is part of the samba package. With the version I use (3.0.28a) cd-ing into folders with spaces in the name is a drag. You have to put the folder name in quotes: smb: \Shared\> cd "Marketing and PR"
This is sample output - yours may be different.
3

smbclient -U userbob //10.1.1.75/Shared

ethanmiller · 2009-04-22 19:58:51 11
eth-tool summary of eth# devices

Give the Speed and Link status of eth# 0-3. This is sort of what mii-tool does, but eth-tool is better, yet lacks device discovery. Show Sample Output
This is sample output - yours may be different.
```
eth0
        Speed: Unknown! (65535)
        Link detected: no
eth1
        Speed: Unknown! (65535)
        Link detected: no
eth2
        Speed: 1000Mb/s
        Link detected: yes
eth3
        Speed: Unknown! (65535)
        Link detected: no
```
6

for M in 0 1 2 3 ; do echo eth$M ;/sbin/ethtool eth$M | grep -E "Link|Speed" ; done

Wubby · 2009-04-22 19:32:41 9
a short counter

Maybe you know shorter ? Show Sample Output
This is sample output - yours may be different.
```
1
     2
     3
     4
```
18

yes '' | cat -n

flux · 2009-04-22 17:58:46 15
Refresh profile file

If you edit your .profile you need to refresh it for changes to take place. Simple way to refresh is logout and login. This command is the quickest way to do it. If you're deleting some variables, they would not get nulled with this command but just removed.
This is sample output - yours may be different.
-5

. ~/.profile

ruchi · 2009-04-22 16:56:12 16
Get thread count for process on Solaris
This is sample output - yours may be different.
0

ps -L -p <pid> | wc -l

adamm9 · 2009-04-22 15:05:26 5
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Show network throughput

Real gurus don't need fancy tools like iftop or jnettop.

find previously entered commands

Searches bash-history in reverse order (last entered commands first). Pressing ctrl+r again shows the next matching entry.

Show all LISTENing and open server connections, with port number and process name/pid

Determine next available UID

Typical usage would be in a script that would want the next open UID in a range (in this case 500-600)

count how many cat processes are running

Rename files in batch

Add all unversioned files to svn

No need for grep, let awk do the match. This will not behave properly if the filenames contains whitespace, which is awk's default field separator.

Determine if photos have been rotated to portrait orientation instead of normal landscape orientation

Most people take photos in landscape orientation (wider than it is tall). Sometimes though you turn the camera sideways to capture a narrow/tall subject. Assuming you then manually rotate those picture files 90 degrees for proper viewing on screen or photo frame, you now have a mix of orientations in your photos directory. This command will print out the names of all the photos in the current directory whose vertical resolution is larger than its horizontal resolution (i.e. portrait orientation). You can then take that list of files and deal with them however you need to, like re-rotating back to landscape for consistent printing with all the others. This command requires the "identify" command from the ImageMagick command-line image manipulation suite. Sample output from identify: $ identify PICT2821.JPG PICT2821.JPG JPEG 1536x2048 1536x2048+0+0 8-bit DirectClass 688KB 0.016u 0:00.006

Count TCP States From Netstat

Counts TCP states from Netstat and displays in an ordered list.

Image to color palette generator

Extract a color palette from a image useful for designers. Example usage: $extract-palette myawesomeimage.jpg 4 Where the first argument is the image you want to extract a palette from. The second argument is the number of colors you want. It may be the case where you want to change the search space. In that case, change the -resize argument to a bigger or smaller result. See the ImageMagick documentation for the -resize argument.

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