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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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Place the argument of the most recent command on the shell

This works if your terminal is in Vi mode

Retrieve "last modified" timestamp of web resource in UTC seconds

This command line assumes that "${url}" is the URL of the web resource. It can be useful to check the "freshness" of a download URL before a GET request.

List docker volumes by container

remove OSX resource forks ._ files

DESCRIPTION For each dir, dot_clean recursively merges all ._* files with their cor- responding native files according to the rules specified with the given arguments. By default, if there is an attribute on the native file that is also present in the ._ file, the most recent attribute will be used. If no operands are given, a usage message is output. If more than one directory is given, directories are merged in the order in which they are specified.

Download SSL server certificate with opsnessl

Useful when we need to create new certificate for site when current one is near expiry. This downloaded cert can be used to provide organisational data directly to new cert. using below command. e.g. openssl x509 -x509toreq -in /tmp/example.com.cert -out example.com.csr -signkey example.com-key.pem

recursive search and replace old with new string, inside files

Using -Z with grep and -0 with xargs handles file names with spaces and special characters.

Automatically connect to a host with ssh once it is online

Convert all Flac in a directory to Mp3 using maximum quality variable bitrate

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"

Monitor memory without top or htop

It repeats a command, such as free, every five seconds and highlights the differences

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